BEGIN:VCALENDAR VERSION:2.0 PRODID:-//CERN//INDICO//EN BEGIN:VEVENT SUMMARY:Seminaire de Matiere Condensee et Physique Statistique: Water and Anomalous Liquids DTSTART;VALUE=DATE-TIME:20081114T130000Z DTEND;VALUE=DATE-TIME:20081114T140000Z DTSTAMP;VALUE=DATE-TIME:20130618T054626Z UID:indico-event-45376@cern.ch DESCRIPTION:Water is an essential fluid for the life\, although its behavi or often diverges from that of what could be considered a “normal” flu id. In fact\, presently there are at least sixty known anomalies of water. One of them\, for example\, is related to the increase of density with te mperature\, which allows the fishes to survive beneath frozen lakes. Anoth er example would be the high capacity to absorb heat\, an essential fact\n for the regulation of our body temperature. Another peculiar fact is that liquid water can reach\, without freezing\, extremely low temperatures: -4 7 ºC in a plant and -92ºC in a laboratory. Under 0 ºC it has been obser ved that liquid water displays two configurations with different densities . Nevertheless\, it has still not been possible to determine if these conf igurations can be considered as two different phases\, like the liquid and the gas. In order to explain these phenomena\, several hypotheses have be en proposed. They display the same theoretical predictions in the region a ccessible to the experiments\, but they have different implications and\, until now\, none of them has been ruled out by the experiments. In this ta lk I will discuss their implications in different systems\, such as protei ns solutions\, and how water is related to other anomalous liquids\, such as liquid metals.\n\nhttp://indico.cern.ch/conferenceDisplay.py?confId=453 76 LOCATION:EPFL\, Salle 727 du BSP URL:http://indico.cern.ch/conferenceDisplay.py?confId=45376 END:VEVENT BEGIN:VEVENT SUMMARY:Quantum phase transitions and unconventional behaviour in 2D quant um Heisenberg models DTSTART;VALUE=DATE-TIME:20081119T101500Z DTEND;VALUE=DATE-TIME:20081119T111500Z DTSTAMP;VALUE=DATE-TIME:20130618T054626Z UID:indico-event-45378@cern.ch DESCRIPTION:I will talk about quantum phase transitions and critical expon ents in a special class of 2D quantum Heisenberg antiferromagnets. In par ticular\, I discuss recent quantum Monte Carlo results on the "staggered" Heisenberg model\, which has been discussed in relation to the exciting no tion of "deconfined quantum criticality". By a detailed comparison to oth er dimerized models\, we show\, contrary to the current belief\, that the critical exponents of the staggered model are most likely not in agreement with the 3D classical Heisenberg universality class. I will also prenset further thermodynamic studies on the quantum criticial region which reinf orce these findings.\n\nhttp://indico.cern.ch/conferenceDisplay.py?confId= 45378 LOCATION:EPFL\, Salle 727 du BSP URL:http://indico.cern.ch/conferenceDisplay.py?confId=45378 END:VEVENT BEGIN:VEVENT SUMMARY:Searching for Cold Dark Matter Signatures in the Milky Way DTSTART;VALUE=DATE-TIME:20081201T130000Z DTEND;VALUE=DATE-TIME:20081201T140000Z DTSTAMP;VALUE=DATE-TIME:20130618T054626Z UID:indico-event-46371@cern.ch DESCRIPTION:We have strong evidence that about 95% of matter in our Univer se is dark\, revealing its presence only by its gravitational attraction. In hierarchical structure formation\, two macro-structures exist in the Mi lky Way: the dark halo\, and the dark disk. If the dark matter in these st ructures is made of Weakly Interacting Massive Particles\, it can be direc tly detected via elastic scattering from nuclei in ultra- low background\, deep underground detectors. I will give an informal overview of the exper iments with best sensitivities to date\, and show the prospects for the ne ar future. I will comment on the DAMA evidence for an annual modulation of their event rate\, and compare with current\, or expected results from ot her direct detection experiments.\n\nhttp://indico.cern.ch/conferenceDispl ay.py?confId=46371 LOCATION:EPFL\, Salle 727 du BSP EPFL\, Salle 727 du BSP URL:http://indico.cern.ch/conferenceDisplay.py?confId=46371 END:VEVENT BEGIN:VEVENT SUMMARY:CFT driven cosmology and DGP/CFT Correspondence DTSTART;VALUE=DATE-TIME:20081204T070000Z DTEND;VALUE=DATE-TIME:20081204T080000Z DTSTAMP;VALUE=DATE-TIME:20130618T054626Z UID:indico-event-46857@cern.ch DESCRIPTION:We consider the model of initial conditions and dynamical evol ution of the early Universe cosmology driven by a conformal field theory. This model incorporates a mechanism restricting the cosmological constant range (potentially useful for constraining the landscape of string vacua)\ , contains the dark energy mechanism in the form of the so-called big boos t scenario and is likely to suggest a new type of field-theoretic duality -- the DGP/CFT correspondence.\n\nhttp://indico.cern.ch/conferenceDisplay. py?confId=46857 LOCATION: EPFL\, Salle 727 du BSP\, EPFL URL:http://indico.cern.ch/conferenceDisplay.py?confId=46857 END:VEVENT BEGIN:VEVENT SUMMARY:Composite fermions in Electroweak Symmetry Breaking DTSTART;VALUE=DATE-TIME:20081208T130000Z DTEND;VALUE=DATE-TIME:20081208T140000Z DTSTAMP;VALUE=DATE-TIME:20130618T054626Z UID:indico-event-46890@cern.ch DESCRIPTION:If the electroweak symmetry is broken by some unspecified stro ng dynamics\, composite fermions may exist with definite transformation pr operties under $SU(2)_L\\times SU(2)_R/SU(2)_{L+R}$ and may play a role in giving masses by mixing to all the standard quarks and leptons. Assuming this to be the case\, we analyze the role of Singlets\, Doublets and Tripl ets in the ElectroWeak Precision Tests and in Flavour Physics.\nDoublets a nd Triplets are generically disfavoured. In the Singlet case\, we specify the breaking patterns of the flavour group that allow to keep the CKM pict ure of flavour physics and we discuss the effects of the mixing between co mposite and elementary fermions. These mixings affect in particular the LH C phenomenology of the composite fermions.\n\nhttp://indico.cern.ch/confer enceDisplay.py?confId=46890 LOCATION: EPFL\, Salle 727 du BSP\, EPFL URL:http://indico.cern.ch/conferenceDisplay.py?confId=46890 END:VEVENT BEGIN:VEVENT SUMMARY:Probabilistic fine-graining for anomalous scaling: the case of fin ance DTSTART;VALUE=DATE-TIME:20090127T101500Z DTEND;VALUE=DATE-TIME:20090127T111500Z DTSTAMP;VALUE=DATE-TIME:20130618T054626Z UID:indico-event-50957@cern.ch DESCRIPTION:http://indico.cern.ch/conferenceDisplay.py?confId=50957 LOCATION:EPFL\, Salle 727 du BSP EPFL\, Salle 727 du BSP\, EPFL URL:http://indico.cern.ch/conferenceDisplay.py?confId=50957 END:VEVENT BEGIN:VEVENT SUMMARY:Quarkyonic Matter and the Phase Diagram of QCD at Large Nc DTSTART;VALUE=DATE-TIME:20090316T130000Z DTEND;VALUE=DATE-TIME:20090316T140000Z DTSTAMP;VALUE=DATE-TIME:20130618T054626Z UID:indico-event-54596@cern.ch DESCRIPTION:I argue that in the large N-c limit of QCD\, there are three d istinct phases of QCD\nin the temperature-baryon chemical potential plane. One is confined mesonic matter with an energy density of order 1\, and ze ro baryon density. The second deconfined matter with an energy density of order Nc^2\, and finite baryon density.\nThe third is quarkyonic matter wi th an energy density of order N_c\, that is confined and has finite baryon density. I discuss such matter\, its relation with chiral symmetry breaki ng\, and its relation with matter for N_c = 3.\n\nhttp://indico.cern.ch/co nferenceDisplay.py?confId=54596 LOCATION:EPFL\, Salle 727 du BSP EPFL\, Salle 727 du BSP\, EPFL URL:http://indico.cern.ch/conferenceDisplay.py?confId=54596 END:VEVENT BEGIN:VEVENT SUMMARY:SUSY without Little Hierarchy DTSTART;VALUE=DATE-TIME:20090420T120000Z DTEND;VALUE=DATE-TIME:20090420T133000Z DTSTAMP;VALUE=DATE-TIME:20130618T054626Z UID:indico-event-57003@cern.ch DESCRIPTION:I discuss a simple gauge extension of the minimal supersymmetr ic standard model (MSSM)\, where the fine tuning in the Higgs mass paramet ers is highly reduced. The Higgs boson is insensitive to high energies be cause of supersymmetry and also because it is a pseudo-Goldstone boson of a global symmetry (referred to as "double protection" or 'super-liittle Hi ggs" mechanism). A large shift in the Higgs quartic self coupling is obta ined via a non-decoupling D-term coming from an extra gauge group\, result ing in a Higgs that can be as heavy as 135 GeV with a tuning milder than 1 0%. With an appropriate choice of quantum numbers one can achieve that th e additional quartic is generated without corresponding shift in the Higgs mass\, thus preserving the double protection of the Higgs.\n\nhttp://indi co.cern.ch/conferenceDisplay.py?confId=57003 LOCATION: EPFL\, Salle 727 du BSP URL:http://indico.cern.ch/conferenceDisplay.py?confId=57003 END:VEVENT BEGIN:VEVENT SUMMARY:Interfaces in bicontinuous surfactant phases DTSTART;VALUE=DATE-TIME:20090420T133000Z DTEND;VALUE=DATE-TIME:20090420T143000Z DTSTAMP;VALUE=DATE-TIME:20130618T054626Z UID:indico-event-57083@cern.ch DESCRIPTION:http://indico.cern.ch/conferenceDisplay.py?confId=57083 LOCATION:EPFL\, Salle 626 du BSP EPFL\, Salle 626 du BSP URL:http://indico.cern.ch/conferenceDisplay.py?confId=57083 END:VEVENT BEGIN:VEVENT SUMMARY:Modeling gels and glasses: What can we learn from jammed\, thick and slow materials? DTSTART;VALUE=DATE-TIME:20090428T100000Z DTEND;VALUE=DATE-TIME:20090428T110000Z DTSTAMP;VALUE=DATE-TIME:20130618T054626Z UID:indico-event-57659@cern.ch DESCRIPTION:http://indico.cern.ch/conferenceDisplay.py?confId=57659 LOCATION:CERN 1-1-025 URL:http://indico.cern.ch/conferenceDisplay.py?confId=57659 END:VEVENT BEGIN:VEVENT SUMMARY:A new approach to the Hubbard model DTSTART;VALUE=DATE-TIME:20090623T091500Z DTEND;VALUE=DATE-TIME:20090623T103000Z DTSTAMP;VALUE=DATE-TIME:20130618T054626Z UID:indico-event-58832@cern.ch DESCRIPTION:In this talk\, I will describe a new representation for electr ons\, in which\, an electron is envisaged as a composite of a spinless fer mion and the Pauli spin-1/2. Interestingly\, this representation simplifie s the Hubbard interaction. On a biparite lattice\, at half filling\, the A nderson superexchange correctly emerges within a simple decouppling of the Pauli spins from the spinless fermions. In the infinite U limit\, the Hub bard model reduces to a particularly elegant form (reminiscent of the Ande rson-Hasegawa double exchange problem) which so manifestly reveals the pos sibility of metallic magnetism (this is otherwise a very non-trivial probl em as initiated by Nagaoka). I will further describe some exact calculatio ns in 1d\, and conclude with an over-view of the current work based on thi s representation.\n \nReferences: B. Kumar\, Phys. Rev. B 77\, 205115 (200 8)\n B. Kumar\, Phys. Rev. B 79\, 155121 (2009)\n\nhttp: //indico.cern.ch/conferenceDisplay.py?confId=58832 LOCATION:Lausanne EPFL\, Salle 727 du BSP (Cubotron) URL:http://indico.cern.ch/conferenceDisplay.py?confId=58832 END:VEVENT BEGIN:VEVENT SUMMARY:String Gas Cosmology and Structure Formation DTSTART;VALUE=DATE-TIME:20090629T120000Z DTEND;VALUE=DATE-TIME:20090629T130000Z DTSTAMP;VALUE=DATE-TIME:20130618T054626Z UID:indico-event-63045@cern.ch DESCRIPTION:I will present a toy model of early universe cosmology - strin g gas cosmology- which is based on some fundamental principles of string t heory. This model yields a mechanism for producing primordial cosmologica l perturbations which reproduces the successes of the inflationary scenari o\, and at the same time makes specific predictions with which it can be d istinguished observationally.\n\nhttp://indico.cern.ch/conferenceDisplay.p y?confId=63045 LOCATION: EPFL\, Salle 727 du BSP\, EPFL URL:http://indico.cern.ch/conferenceDisplay.py?confId=63045 END:VEVENT BEGIN:VEVENT SUMMARY:Three-loop Hard Thermal Loop Free Energy for QED DTSTART;VALUE=DATE-TIME:20090817T120000Z DTEND;VALUE=DATE-TIME:20090817T130000Z DTSTAMP;VALUE=DATE-TIME:20130618T054626Z UID:indico-event-66284@cern.ch DESCRIPTION:We calculate the free energy of a hot gas of electrons and pho tons to three loops using the hard-thermal-loop perturbation theory reorga nization of finite temperature perturbation theory. We demonstrate that th e hard-thermal-loop perturbation reorganization improves the convergence o f successive approximations to the QED free energy at large coupling\, e i s about 2. The reorganization is gauge invariant by construction and formu lated in Minkowski space-time. We obtain a completely analytic result for the resumed thermodynamic potential at three loops\, which is in good agre ement with that obtained from other methods\, such as the Phi-derivable ap proach. The result sets the stage for the corresponding three-loop resumed calculation in QCD. Once obtained\, this will represent the state-of-the- art calculation of the hightemperature QCD free energy. The talk is design ed for general audiences with mostly plots explaining physical pictures\, (almost) no technical details involved.\n\nhttp://indico.cern.ch/conferenc eDisplay.py?confId=66284 LOCATION: EPFL\, Salle 727\, BSP (Cubotron) URL:http://indico.cern.ch/conferenceDisplay.py?confId=66284 END:VEVENT BEGIN:VEVENT SUMMARY:The Schwinger boson mean-field theory: application to the Dzyalos hinskii-Moriya interaction on the Kagomé lattice DTSTART;VALUE=DATE-TIME:20091028T101500Z DTEND;VALUE=DATE-TIME:20091028T111500Z DTSTAMP;VALUE=DATE-TIME:20130618T054626Z UID:indico-event-71032@cern.ch DESCRIPTION:Few theoretical tools are able to describe strong quantum fluc tuations. Among them\, the Schwinger boson mean-field theory (SBMFT) is kn own to possibly describe resonating valence bond spin liquids as well as m agnetically ordered states. After a presentation of the method\, I will sh ow the phase diagram of the Heisenberg antiferromagnet on the Kagomé latt ice perturbed by a DM interaction. The influence of the spin value will be analysed. We will show the results of dynamical structure factor calculat ions in different regions of the phase diagram.\n\nhttp://indico.cern.ch/c onferenceDisplay.py?confId=71032 LOCATION:EPFL\, Salle 727 du BSP URL:http://indico.cern.ch/conferenceDisplay.py?confId=71032 END:VEVENT BEGIN:VEVENT SUMMARY:Dark Matter Interpretations of the Electron/Positron Excesses afte r FERMI DTSTART;VALUE=DATE-TIME:20091116T160000Z DTEND;VALUE=DATE-TIME:20091116T170000Z DTSTAMP;VALUE=DATE-TIME:20130618T054626Z UID:indico-event-74375@cern.ch DESCRIPTION:The cosmic-ray excess observed by PAMELA in the positron fract ion and by\nFERMI and HESS in the electron + positron flux can be interpre ted in terms of DM annihilations or decays into leptonic final states. Fin al states into tau's or 4mu give the best fit to the excess. However\, in the annihilation scenario\, they are incompatible with photon and neutrino constraints\, unless DM has a quasiconstant density profile. Final states involving electrons are less constrained but poorly fit the excess\, unle ss hidden sector radiation makes their energy spectrum smoother\, allowing a fit to all the data with a combination of leptonic modes. In general\, DM lighter than about a TeV cannot fit the excesses\, so PAMELA should fin d a greater positron fraction at higher energies. The DM interpretation ca n be tested by FERMI gamma observations above 10 GeV: if the electronic ex cess is everywhere in the DM halo\, inverse Compton scattering on ambient light produces a well-predicted gamma excess that FERMI should soon detect .\n\nhttp://indico.cern.ch/conferenceDisplay.py?confId=74375 LOCATION: EPFL\, Salle N. 727 BSP URL:http://indico.cern.ch/conferenceDisplay.py?confId=74375 END:VEVENT BEGIN:VEVENT SUMMARY:Folding Proteins and Assembling Viruses. Insights in the Bioscienc es using Ultrasenstive Fluorescence Methods DTSTART;VALUE=DATE-TIME:20091130T100000Z DTEND;VALUE=DATE-TIME:20091130T110000Z DTSTAMP;VALUE=DATE-TIME:20130618T054626Z UID:indico-event-74740@cern.ch DESCRIPTION:Heat Shock Proteins are involved in numerous processes in the cell including protein folding\,\nprevention of protein aggregation and tr anslocation of proteins across membranes. In this talk\, I will summarize results from measurements on two types of heat shock proteins\, GroEL\, a\ nChaperonin and the class of HSP70 proteins. Using burst analysis with pul sed interleaved\nexcitation\, we have performed single-pair Förster reson ance energy transfer (FRET) experiments to monitor the conformation of a p rotein substrate at different time points during the folding cycle of GroE L or the conformation of HSP70 upon interactions with nucleotides\, co-cha perones and substrates. Many proteins require the assistance of molecular chaperones to fold rapidly and efficiently. Chaperone proteins are believe d to aid protein folding by isolating the nascent polypeptide chain from d eleterious interactions within the cell. Our results suggest a much more a ctive involvement of GroEL in the folding of nascent proteins. HSP70 consi sts of two functional domains: the N-terminal ATPase domain where ATP and ADP can bind and the C-terminal substrate binding domain which can bind sh ort peptides. Binding of ATP/ADP drives conformational changes in this pro tein though the nature of these changes remains elusive. We have investiga ted the conformation of HSP70 by cloning a number of mutants that allowed specific labeling of the different domains. These mutants make it possible to follow lid closure and interdomain separation in the presence of ATP o r ADP as well as in the absence or presence of peptide substrates or co-ch aperones. With the aid of single-particle tracking\, we have investigated the assembly of HI-viruses. The main structural protein of HIV (GAG) has b een fluorescently labeled with GFP. As a virus assembles\, GAG proteins ar e delivered to the budding site. We have investigated the dynamics of the virus assembly process\, visualizing whether GAG is delivered from the mem brane or directly from the cytosol and determined the size of the budding sites. By monitoring the mobility of the budding sites\, we have also been able to visualize virus release.\n\nhttp://indico.cern.ch/conferenceDispl ay.py?confId=74740 LOCATION: EPFL\, Auditoire II du BSP URL:http://indico.cern.ch/conferenceDisplay.py?confId=74740 END:VEVENT BEGIN:VEVENT SUMMARY:Modelling cellular metabolism old laces\, new pieces and open prob lems DTSTART;VALUE=DATE-TIME:20091209T100000Z DTEND;VALUE=DATE-TIME:20091209T110000Z DTSTAMP;VALUE=DATE-TIME:20130618T054626Z UID:indico-event-75206@cern.ch DESCRIPTION:Metabolic networks control some of the most basic tasks living cells must perform\, from energy transduction to growth and reproduction. While relatively hard to access experimentally\, they are very well chara cterized at the biochemical and genetic levels. Still\, their overall dyna mical organization poses challenging problems of huge practical relevance\ , ranging from the identification of potential drug targets to the predict ion of a cell's response to enzymopathies or environmental shifts. We revi ew the standard computational approaches to modeling metabolism and their limitations. Then we discuss a recently‐introduced theoretical framework that overcomes some of them by allowing to (a) infer cellular objectives and (b) predict reaction fluxes correctly in E.coli. Recent developments r egarding human red blood cells are also considered\, together with the mai n open issues. The outlook of the talk is that improving our understanding of the emergence of cellular functions from the metabolic activity requir es a better grasp of the *physical* properties of metabolism.\nRef.: PNAS 106 2607 (2009)\n\nhttp://indico.cern.ch/conferenceDisplay.py?confId=75206 LOCATION: EPFL\, Salle N. 727 BSP URL:http://indico.cern.ch/conferenceDisplay.py?confId=75206 END:VEVENT BEGIN:VEVENT SUMMARY:Getting ready to define jets at the LHC DTSTART;VALUE=DATE-TIME:20100111T130000Z DTEND;VALUE=DATE-TIME:20100111T140000Z DTSTAMP;VALUE=DATE-TIME:20130618T054626Z UID:indico-event-79642@cern.ch DESCRIPTION:"Jets"\, ie collimated bunches of particles\, are used in coll ider physics since decades. Over this\nperiod\, many different recipes hav e been introduced to define the jets from the particles in an event. The main body of this talk reviews these various "jet definitions" putting a p articular emphasis on new algorithms that have been introduced recently to cure issues with the ones used at the Tevatron. I will then discuss thei r implications on LHC physics. In the last part of the talk\, I will compa re the performances of the different jet definitions for kinematic reconst ructions at the LHC.\n\nhttp://indico.cern.ch/conferenceDisplay.py?confId= 79642 LOCATION: EPFL\, Salle N. 727 BSP URL:http://indico.cern.ch/conferenceDisplay.py?confId=79642 END:VEVENT BEGIN:VEVENT SUMMARY:Light Higgs Scenario in BMSSM and LEP Precision Data DTSTART;VALUE=DATE-TIME:20100215T130000Z DTEND;VALUE=DATE-TIME:20100215T140000Z DTSTAMP;VALUE=DATE-TIME:20130618T054626Z UID:indico-event-85051@cern.ch DESCRIPTION:In this Letter we consider very light Higgs fields in BMSSM(Be yond MSSM). The spectrum\nbelow TeV scale is the same as the MSSM but the Higgs potential is modified and is well\ndescribed in terms of effective d imension five and six operators. A correction from the\nBMSSM operators al lows us to consider new parameter space of Higgs sector which is\nnot allo wed in the MSSM. It can be regarded as a constrained version of general 2 Higgs doublet model (2HDM) as long as Higgs sector is concerned. We focus on the possibility that CP odd Higgs (A) mass is about 7 or 8 GeV and char ged Higgs mass is comparable to W mass. At the same time one of the CP eve n Higgs (h) is light enough such that h and A production at the Z pole is kinematically allowed. The tension between forward backward asymmetry of b ottom quark Ab_FB measured at LEP and the Standard Model prediction can be ameliorated if bottom quark pair produced from light CP even Higgs is tak en into account.\n\nhttp://indico.cern.ch/conferenceDisplay.py?confId=8505 1 LOCATION: EPFL\, Salle N. 727 BSP URL:http://indico.cern.ch/conferenceDisplay.py?confId=85051 END:VEVENT BEGIN:VEVENT SUMMARY:Simulation of fermionic lattice models in two dimensions with tens or network algorithms ? DTSTART;VALUE=DATE-TIME:20100217T101500Z DTEND;VALUE=DATE-TIME:20100217T111500Z DTSTAMP;VALUE=DATE-TIME:20130618T054626Z UID:indico-event-85052@cern.ch DESCRIPTION:The simulation of strongly correlated fermionic systems in two dimensions is\none of the biggest challenges in computational physics. Qu antum Monte\nCarlo is very powerful for solving bosonic models\, but it fa ils for fermionic\nsystems because of the negative sign problem. In this t alk I will present an\napproach to efficiently simulate fermionic systems in two dimensions\, based\non tensor network algorithms such as the multi- scale entanglement\nrenormalization ansatz (MERA) and infinite projected p air-entangled states (iPEPS). These algorithms have been successfully appl ied to bosonic systems in past years\, but not to fermionic systems until recently. I will introduce a particularly simple formalism to account for the statistics of fermionic degrees of freedom in a tensor network. Benchm ark results for free and interacting fermions confirm the validity of this approach\, and show that the computational cost of simulations does not d epend a priori on the particle statistics\, but on the amount of entanglem ent in the system.\n\nhttp://indico.cern.ch/conferenceDisplay.py?confId=85 052 LOCATION: EPFL\, Salle N. 727 BSP URL:http://indico.cern.ch/conferenceDisplay.py?confId=85052 END:VEVENT BEGIN:VEVENT SUMMARY:The Complex Structure of Scattering Amplitudes DTSTART;VALUE=DATE-TIME:20100301T130000Z DTEND;VALUE=DATE-TIME:20100301T140000Z DTSTAMP;VALUE=DATE-TIME:20130618T054626Z UID:indico-event-86650@cern.ch DESCRIPTION:Unitarity and Analyticity of scattering amplitudes\, when comb ined with Cauchy's Residue Theorem and its multivariate generalizations vi a Stokes' Theorem\, turn into powerful techniques for evaluating radiative corrections. In the context of the by-now known as unitarity-based method s\, I shall review how the simple implementation of complex momenta for pr opagating particles enable us to carry out the calculation of tree-level a nd one-loop amplitudes very efficiently\, and to provide\, as well\, the O ptical Theorem with a geometrical interpretation as a Berry's phase.\n\nht tp://indico.cern.ch/conferenceDisplay.py?confId=86650 LOCATION:EPFL Salle 727\, BSP\, EPFL URL:http://indico.cern.ch/conferenceDisplay.py?confId=86650 END:VEVENT BEGIN:VEVENT SUMMARY:Superconducting non-Abelian vortices in Weinberg --Salam theory -- electroweak thunderbolts DTSTART;VALUE=DATE-TIME:20100308T130000Z DTEND;VALUE=DATE-TIME:20100308T140000Z DTSTAMP;VALUE=DATE-TIME:20130618T054626Z UID:indico-event-87512@cern.ch DESCRIPTION:We present a detailed analysis of classical solutions in the b osonic sector of the electroweak theory which describe vortices carrying a constant electric current I.\nThese vortices exist for any value of the H iggs boson mass and for any weak mixing angle\, and in the zero current li mit they reduce to Z strings. Their current is produced by the condensate of vector W bosons and typically it can attain billions of amperes. It see ms that the current can be arbitrarily large\, due to the scale invariance of the vector boson condensate. Finite vortex segments can be perturbativ ely stable. This suggests that they can transfer electric charge between d ifferent regions of space\, similarly to thunderbolts. It is also possible that they can form loops stabilized by the centrifugal force --electrowea k vortons.\n\nhttp://indico.cern.ch/conferenceDisplay.py?confId=87512 LOCATION:EPFL Salle 727\, BSP URL:http://indico.cern.ch/conferenceDisplay.py?confId=87512 END:VEVENT BEGIN:VEVENT SUMMARY:The Dawn of Quantum Leptogenesis DTSTART;VALUE=DATE-TIME:20100315T130000Z DTEND;VALUE=DATE-TIME:20100315T140000Z DTSTAMP;VALUE=DATE-TIME:20130618T054626Z UID:indico-event-87589@cern.ch DESCRIPTION:Thermal leptogenesis explains the observed matter-antimatter a symmetry of the universe in terms of neutrino masses\, consistent with neu trino oscillation experiments. Almost all leptogenesis computations are ba sed on Boltzmann equations. As classical Markovian equations for phase spa ce distribution functions\, these suffer from basic conceptual problems wh en quantum effects like coherent oscillations or memory effects are releva nt. Hence\, it is important to understand the range of validity of the Bol tzmann equations\nand estimate the size of the corrections. We present a f ull quantum mechanical calculation of the generated lepton asymmetry based on Kadanoff-Baym equations. Origin of the asymmetry is the departure of the statistical propagator of the heavy Majorana neutrino from the equilib rium propagator\, together with CP violating couplings.\nThe lepton asymme try is calculated directly in terms of Green's functions without referring to `number densities'. A detailed comparis! on with Boltzmann equations s hows that conventional leptogenesis calculations have an uncertainty of at least one order of magnitude. Particularly important is the inclusion of thermal damping rates in the full quantum mechanical computation.\n\nhttp: //indico.cern.ch/conferenceDisplay.py?confId=87589 LOCATION:EPFL Salle 727 BSP URL:http://indico.cern.ch/conferenceDisplay.py?confId=87589 END:VEVENT BEGIN:VEVENT SUMMARY:The all-order structure of long-distance singularities for massles s gauge theories DTSTART;VALUE=DATE-TIME:20100322T130000Z DTEND;VALUE=DATE-TIME:20100322T140000Z DTSTAMP;VALUE=DATE-TIME:20130618T054626Z UID:indico-event-88676@cern.ch DESCRIPTION:Infrared and collinear singularities in perturbation theory en code information on the long-range interactions of gauge fields\, and are responsible for large corrections to physical cross sections that are impo rtant for collider phenomenology. I will review recent significant progres s in our understanding of these singularities. For planar amplitudes\, we now know that all singularities are generated by just three anomalous dime nsions\, which can be defined non-perturbatively in terms of Wilson lines and local operators. For N=4 Super Yang-Mills theory\, the resulting expon entiation matches strong coupling calculations performed using the AdS/CFT correspondence\, and points to possible exact results. Beyond the planar limit\, the special properties of light-like Wilson lines severely constra in the form of the soft anomalous dimension matrices that govern exponenti ation. A simple sum-over-dipoles formula emerges\, which is conjectured to encode all soft singularities for any massless gauge theory.\nSuggested i ntroductory readings: Phys. Rev. D42 p. 4222 (1990)\,\narXiv:0901.1091\, a rXiv:0910.3653\n\nhttp://indico.cern.ch/conferenceDisplay.py?confId=88676 LOCATION:EPFL Cubotron 727 URL:http://indico.cern.ch/conferenceDisplay.py?confId=88676 END:VEVENT BEGIN:VEVENT SUMMARY:The Trace Anomaly and Effective Action of Low Energy Gravity DTSTART;VALUE=DATE-TIME:20100329T120000Z DTEND;VALUE=DATE-TIME:20100329T130000Z DTSTAMP;VALUE=DATE-TIME:20130618T054626Z UID:indico-event-88675@cern.ch DESCRIPTION:This work identifies how the trace anomaly leads to terms in t he effective action which are relevant in the infrared and can have macros copic effects near black hole horizons and for cosmological dark energy. B ased on the papers :\nPhys.Rev.D79:045014\, 2009\nPhys.Rev.D80:084005\, 20 09\n\nhttp://indico.cern.ch/conferenceDisplay.py?confId=88675 LOCATION:EPFL Salle 727\, BSP\, EPFL URL:http://indico.cern.ch/conferenceDisplay.py?confId=88675 END:VEVENT BEGIN:VEVENT SUMMARY:Microscopic gravity DTSTART;VALUE=DATE-TIME:20100419T120000Z DTEND;VALUE=DATE-TIME:20100419T130000Z DTSTAMP;VALUE=DATE-TIME:20130618T054626Z UID:indico-event-90896@cern.ch DESCRIPTION:We shall review our understanding of microscopic gravity and t he role of Standard\nModel type particle species and their symmetries in i t. Physics of macroscopic and\nmicroscopic black holes will play an import ant role in our considerations. Some experimental\nconsequences will also be discussed.\n\nhttp://indico.cern.ch/conferenceDisplay.py?confId=90896 LOCATION:EPFL Cubotron 727 URL:http://indico.cern.ch/conferenceDisplay.py?confId=90896 END:VEVENT BEGIN:VEVENT SUMMARY:Monopoles\, Anomalies\, and Electroweak Symmetry Breaking DTSTART;VALUE=DATE-TIME:20100426T120000Z DTEND;VALUE=DATE-TIME:20100426T133000Z DTSTAMP;VALUE=DATE-TIME:20130618T054626Z UID:indico-event-92031@cern.ch DESCRIPTION:I will discuss how massless fermionic monopoles can condense a nd break the electroweak\ngauge symmetry and give a large top quark mass.\ n\n\nReferences: Preskill: Magnetic Monopoles Ann.Rev.Nucl.Part.Sci.34:461 -530\,1984\;\nElectroweak Symmetry Breaking From Monopole Condensation. Cs aba Csaki\, Yuri\nShirman\, John Terning e-Print: arXiv:1003.1718\; Anomal y Constraints on Monopoles\nand Dyons. Csaba Csaki\, John Terning\, Yuri S hirman 14pp. e-Print: arXiv:1003.0448\n\nhttp://indico.cern.ch/conferenceD isplay.py?confId=92031 LOCATION:EPFL\, Lausanne Cubotron 727 URL:http://indico.cern.ch/conferenceDisplay.py?confId=92031 END:VEVENT BEGIN:VEVENT SUMMARY:Effective field theory at colliders: top and squark pair productio n DTSTART;VALUE=DATE-TIME:20100621T120000Z DTEND;VALUE=DATE-TIME:20100621T130000Z DTSTAMP;VALUE=DATE-TIME:20130618T054626Z UID:indico-event-98680@cern.ch DESCRIPTION:Standard perturbative calculations of heavy-particle pair prod uction may break down due to enhanced QCD corrections from soft gluon and Coulomb corrections. This talk provides a brief introduction to the modern (soft-collinear and non-relativistic) effective field theory perspective on the problem and shows how resummation is accomplished in this framework . Results are presented for top and squark pair production at the LHC and tops at the ILC and LHC. Suggested readings: M. Beneke et al. - Nucl.Phys. B643:431-476\,2002\; M. Beneke et al. - arXiv:1001.4621\, arXiv:1001.4627\ n\nhttp://indico.cern.ch/conferenceDisplay.py?confId=98680 LOCATION:EPFL Cubotron 727 URL:http://indico.cern.ch/conferenceDisplay.py?confId=98680 END:VEVENT BEGIN:VEVENT SUMMARY:Holographic flavor: constraints\, models\, and implications for th e LHC DTSTART;VALUE=DATE-TIME:20100622T120000Z DTEND;VALUE=DATE-TIME:20100622T130000Z DTSTAMP;VALUE=DATE-TIME:20130618T054626Z UID:indico-event-98679@cern.ch DESCRIPTION:I will discuss various ways on how to avoid the flavor problem in strong electroweak symmetry breaking with special emphasis on holograp hic models. I will introduce a full GIM mechanism (0709.1714)\, partial co mpositeness and its tension with the data (0804.1954)\, and realizing 5D M FV via shining (0907.0474). LHC signatures will be mentioned if time allow s.\n\nhttp://indico.cern.ch/conferenceDisplay.py?confId=98679 LOCATION:EPFL Cubotron 727 URL:http://indico.cern.ch/conferenceDisplay.py?confId=98679 END:VEVENT BEGIN:VEVENT SUMMARY:Effective models for spin liquid phases in Hubbard models DTSTART;VALUE=DATE-TIME:20101027T091500Z DTEND;VALUE=DATE-TIME:20101027T101500Z DTSTAMP;VALUE=DATE-TIME:20130618T054626Z UID:indico-event-111514@cern.ch DESCRIPTION:\nThe Hubbard model is one of the most studied microscopic mod els in condensed matter physics. Generically\, one expects at half filling a metallic phase for large kinetics while a long-range ordered Mott insul ator is present for large interactions.\nA direct transition between the m etal and the longrange ordered Mott insulator was considered to be the sta ndard case for a long time. But in recent years there are more and more ev idences that there is the possibility of exotic and insulating intermediat e phases. It is therefore an obviously relevant question what kind of effe ctive low-energy theory describes such Mott phases and how to derive them. In this talk we discuss these issues for the Mott phase of the Hubbard mo del on the triangular and on the honeycomb lattice. To this end a novel sc heme to derive effective models non-perturbatively is introduced.\n\nhttp: //indico.cern.ch/conferenceDisplay.py?confId=111514 LOCATION:Lausanne Salle 727 du BSP URL:http://indico.cern.ch/conferenceDisplay.py?confId=111514 END:VEVENT BEGIN:VEVENT SUMMARY:Space-Time\, Quantum Mechanics and Scattering Amplitudes DTSTART;VALUE=DATE-TIME:20101104T133000Z DTEND;VALUE=DATE-TIME:20101104T143000Z DTSTAMP;VALUE=DATE-TIME:20130618T054626Z UID:indico-event-111842@cern.ch DESCRIPTION:\nScattering amplitudes in gauge theories and gravity have ext raordinary properties that are completely invisible in the textbook formul ation of quantum field theory.\nThe standard way of computing these amplit udes\, using Feynman diagrams\, make space-time locality and quantum-mecha nical unitarity manifest. However In the last twenty years\, it has become clear that apart from the very simplest processes\, Feynman diagrams are exceedingly complicated\, and furthermore completely hide remarkable featu res of the final result. This strongly suggests that there is a new way of thinking about quantum field theory where the unitary description of a sc attering process in space-time will not play a central role\, but other hi dden physical principles will be made more manifest. The past few years ha ve seen very rapid developments towards uncovering this new picture\, espe cially for the maximally supersymmetric gauge theory in four dimensions\, combining a remarkable collection of ideas from string theory\, integrable systems\, twistor theory as well as new mathematical structures in algebr aic\ngeometry and the theory of motives. In this talk I will review these ideas and discuss the various current directions of research.\n\nhttp://in dico.cern.ch/conferenceDisplay.py?confId=111842 LOCATION:EPFL Auditoire 1 du BSP Cubotron URL:http://indico.cern.ch/conferenceDisplay.py?confId=111842 END:VEVENT BEGIN:VEVENT SUMMARY:Non-Gaussianity - How much can we learn? DTSTART;VALUE=DATE-TIME:20101105T130000Z DTEND;VALUE=DATE-TIME:20101105T140000Z DTSTAMP;VALUE=DATE-TIME:20130618T054626Z UID:indico-event-111843@cern.ch DESCRIPTION:\nThe model of local non-Gaussianity\, parameterised by the co nstant non-linearity parameter fNL\, is an extremely popular description o f non-Gaussianity. However\, a mild scale-dependence of fNL is natural. Th is scale dependence is a new observable\, potentially detectable with the Planck satellite\, which helps to further discriminate between models of i nflation. It is sensitive to properties of the early universe which are no t probed by the standard observables. In a complementary way\, the trispec trum also contain important information about non-Gaussianity which the bi spectrum does not capture. We explicitly calculate the scale dependence an d trispectrum in several models including one with a very large infrared-l oop contribution to the bispectrum and in various realisations of the curv aton scenario.\n\nhttp://indico.cern.ch/conferenceDisplay.py?confId=111843 LOCATION:EPFL Cubotron 727 URL:http://indico.cern.ch/conferenceDisplay.py?confId=111843 END:VEVENT BEGIN:VEVENT SUMMARY:Kinetic Gravity Braiding DTSTART;VALUE=DATE-TIME:20101108T130000Z DTEND;VALUE=DATE-TIME:20101108T143000Z DTSTAMP;VALUE=DATE-TIME:20130618T054626Z UID:indico-event-112936@cern.ch DESCRIPTION:In this talk I will consider scalar field theories with kineti c mixing (which we called braiding) of the scalar and the metric. The most well studied example of these models corresponds to the decoupling limit of DGP\, or to the simplest of the Galileon theories. In particular I will discuss an intriguing connection between these field theories and imperfe ct fluids.\n\nhttp://indico.cern.ch/conferenceDisplay.py?confId=112936 LOCATION:EPFL URL:http://indico.cern.ch/conferenceDisplay.py?confId=112936 END:VEVENT BEGIN:VEVENT SUMMARY:Single molecule spectroscopy of protein folding in a chaperonin ca ge DTSTART;VALUE=DATE-TIME:20101109T130000Z DTEND;VALUE=DATE-TIME:20101109T140000Z DTSTAMP;VALUE=DATE-TIME:20130618T054626Z UID:indico-event-112805@cern.ch DESCRIPTION:Molecular chaperones are known to be essential for avoiding pr otein aggregation in vivo\, but it is still unclear how they affect protei n folding mechanisms. We use single-molecule spectroscopy to probe the sta bility of\nproteins and follow the folding of a protein inside the GroEL/G roES chaperonin cavity over a time range from milliseconds to hours. Our r esults show that confinement in the chaperonin decelerates the folding of the Cterminal domain in the substrate protein rhodanese\, but leaves the f olding rate of the N-terminal domain unaffected. Microfluidic mixing exper iments indicate that strong interactions of the substrate with the cavity walls impede the folding process\, but the folding hierarchy is preserved. Our results imply that no universal chaperonin mechanism exists. Rather\, a competition between intra- and intermolecular interactions determines t he folding rates and mechanisms of a substrate inside the GroEL/GroES cage .\n\nhttp://indico.cern.ch/conferenceDisplay.py?confId=112805 LOCATION:EPFL Cubotron/BSP 727 URL:http://indico.cern.ch/conferenceDisplay.py?confId=112805 END:VEVENT BEGIN:VEVENT SUMMARY:Introduction to tensor network algorithms DTSTART;VALUE=DATE-TIME:20101110T101500Z DTEND;VALUE=DATE-TIME:20101110T111500Z DTSTAMP;VALUE=DATE-TIME:20130618T054626Z UID:indico-event-113162@cern.ch DESCRIPTION:One of the biggest challenges in computational physics is the simulation of strongly correlated systems\, in particular frustrated and f ermionic systems. Borrowing ideas and tools from quantum information and c ondensed matter physics\, a new generation of simulation techniques for ma ny-body systems\, the so-called tensor network algorithms (e.g. PEPS\, MER A)\, have been proposed in the last few years. These tensor networks enabl e an efficient representation of ground states of Hamiltonians with local interactions\, which (usually) obey the so-called "area law" of the entang lement entropy. In this (informal) lecture I will give an introduction to the basic concepts of tensor network (TN) algorithms\, including details a bout the structure\, optimization and evaluation of tensor networks.\n\nht tp://indico.cern.ch/conferenceDisplay.py?confId=113162 LOCATION:EPFL URL:http://indico.cern.ch/conferenceDisplay.py?confId=113162 END:VEVENT BEGIN:VEVENT SUMMARY:Weak Corrections of infrared origin and Dark Matter Indirect Detec tion DTSTART;VALUE=DATE-TIME:20101115T130000Z DTEND;VALUE=DATE-TIME:20101115T140000Z DTSTAMP;VALUE=DATE-TIME:20130618T054626Z UID:indico-event-113163@cern.ch DESCRIPTION:The computation of the energy spectra of Standard Model partic les originated from the annihilation/decay of dark matter particles is of primary importance in indirect searches of dark matter. Recently it was fo und that the inclusion of electroweak corrections significantly alter such spectra when the mass M of dark matter particles is larger than the elect roweak scale: soft electroweak gauge bosons are copiously radiated opening new channels in the final states which otherwise would be forbidden if su ch corrections are neglected. All stable particles are therefore present i n the final spectrum\, independently of the primary channel of dark matter annihilation/decay.\nI present the results of the calculation and discuss more general features of radiative electroweak corrections at the TeV sca le and beyond.\n\nhttp://indico.cern.ch/conferenceDisplay.py?confId=113163 LOCATION:EPFL URL:http://indico.cern.ch/conferenceDisplay.py?confId=113163 END:VEVENT BEGIN:VEVENT SUMMARY:GENEZISS STRING THEORY MEETING DTSTART;VALUE=DATE-TIME:20101126T100000Z DTEND;VALUE=DATE-TIME:20101126T110000Z DTSTAMP;VALUE=DATE-TIME:20130618T054626Z UID:indico-event-114257@cern.ch DESCRIPTION:http://indico.cern.ch/conferenceDisplay.py?confId=114257 LOCATION:EPFL\, Lausanne CM1105 URL:http://indico.cern.ch/conferenceDisplay.py?confId=114257 END:VEVENT BEGIN:VEVENT SUMMARY:Modified gravity as unification of inflation with dark energy: fro m conventional theory to Horava-Lifshitz gravity DTSTART;VALUE=DATE-TIME:20101129T130000Z DTEND;VALUE=DATE-TIME:20101129T140000Z DTSTAMP;VALUE=DATE-TIME:20130618T054626Z UID:indico-event-114968@cern.ch DESCRIPTION:We give a general review of several 4-dimensional models of mo dified gravity: F(R) theory\, Gauss-Bonnet gravity\, non-local gravity and Horava-Lifshitz F(R) theory. Qualitatively\, the possibility to unify the inflation with dark energy in such an approach\, through cosmological rec onstruction procedure\, is demonstrated. The models may pass the local and cosmological tests and have a very rich cosmological structure.\n\nhttp:/ /indico.cern.ch/conferenceDisplay.py?confId=114968 LOCATION:Lausanne URL:http://indico.cern.ch/conferenceDisplay.py?confId=114968 END:VEVENT BEGIN:VEVENT SUMMARY:Pairing in population imbalanced Fermion systems in one and two di mensions DTSTART;VALUE=DATE-TIME:20101208T101500Z DTEND;VALUE=DATE-TIME:20101208T111500Z DTSTAMP;VALUE=DATE-TIME:20130618T054626Z UID:indico-event-113732@cern.ch DESCRIPTION:We use Quantum Monte Carlo simulations to study pairing in one - and two-dimensional fermionic systems governed by the Hubbard model with attractive contact interaction and with imbalanced spin populations. We d etermine the phase diagram as a function of temperature and polarization a nd find that the "Fulde-Ferrell-Larkin-Ovchinnikov'' (FFLO) phase is quite robust and persists to higher temperature for higher polarization. We com pare with experiments on one-dimensional systems currently underway.\n\nht tp://indico.cern.ch/conferenceDisplay.py?confId=113732 LOCATION:EPFL Salle 727 du BSP (Cubotron) URL:http://indico.cern.ch/conferenceDisplay.py?confId=113732 END:VEVENT BEGIN:VEVENT SUMMARY:From Cosmology to Beyond the Standard Model of particle physics: t wo paths to encourage adventurers DTSTART;VALUE=DATE-TIME:20101213T130000Z DTEND;VALUE=DATE-TIME:20101213T140000Z DTSTAMP;VALUE=DATE-TIME:20130618T054626Z UID:indico-event-116551@cern.ch DESCRIPTION:Cosmology asks for modification of the Standard Model of parti cle physics (SM): one has to explain the baryon asymmetry of the Universe\ , the dark matter phenomenon\, the flatness and homogeneity of the Univers e\, the origin of primordial matter perturbations.\nThe only direct eviden ce for incompleteness of the SM is neutrino oscillations\,\nwhich true ext ension of the SM also have to be capable of explaining. We suggest two sim ple examples of such extensions following two different guide lines: one a voiding new physical scales\, another avoiding new interactions. Quite rem arkable\, the first model can be fully explored in particle physics experi ments\, the best place being B-factories.\n\nhttp://indico.cern.ch/confere nceDisplay.py?confId=116551 LOCATION:EPFL Cubotron 727 URL:http://indico.cern.ch/conferenceDisplay.py?confId=116551 END:VEVENT BEGIN:VEVENT SUMMARY:Universality and scale invariance in quasi-two-dimensional trapped Bose gases DTSTART;VALUE=DATE-TIME:20110114T070000Z DTEND;VALUE=DATE-TIME:20110114T080000Z DTSTAMP;VALUE=DATE-TIME:20130618T054626Z UID:indico-event-121631@cern.ch DESCRIPTION:I discuss quasi-two-dimensional Bose gases in harmonic traps a t temperatures\nclose to the Kosterlitz-Thouless transition. Using Quantum Monte Carlo calculations we have studied density profiles\, superfluid an d condensate fractions\, single-particle coherence\, and pair correlations . From the density profile we obtain the equation of state which we compar e directly with experimental measurements.\nQuantitative comparisons with mean-field\, and effective (classical) field theory allows us to study uni versal two-dimensional correlations in the fluctuation region\, and to cha racterize the cross-over from Kosterlitz-Thouless to Bose-Einstein behavio r for small particle numbers.\n\nhttp://indico.cern.ch/conferenceDisplay.p y?confId=121631 LOCATION:EPFL Salle 727 du BSP (Cubotron) URL:http://indico.cern.ch/conferenceDisplay.py?confId=121631 END:VEVENT BEGIN:VEVENT SUMMARY:Puzzles of Dark Matter Searches in the Light of Dark Atoms DTSTART;VALUE=DATE-TIME:20110207T130000Z DTEND;VALUE=DATE-TIME:20110207T140000Z DTSTAMP;VALUE=DATE-TIME:20130618T054626Z UID:indico-event-126350@cern.ch DESCRIPTION:Direct and indirect searches for dark matter lead to serious p roblems for simple models with stable neutral Weakly Interacting Massive P articles (WIMPs) as candidates for dark matter. A possibility is discussed that new stable quarks and charged leptons are bound in neutral dark atom s of composite dark matter. Stable -2 charged particles O−− are bound with primordial helium in O-helium atoms\, being specific nuclear interact ing form of composite dark matter. The positive results of DAMA experiment s are explained as annual modulation of radiative capture of O-helium by s odium nuclei.\nIn the framework of this approach test of DAMA results in d etectors with other chemical content becomes a nontrivial task.\n\nhttp:// indico.cern.ch/conferenceDisplay.py?confId=126350 LOCATION:EPFL Cubotron 727 URL:http://indico.cern.ch/conferenceDisplay.py?confId=126350 END:VEVENT BEGIN:VEVENT SUMMARY:The Higgs: status and perspectives DTSTART;VALUE=DATE-TIME:20110214T130000Z DTEND;VALUE=DATE-TIME:20110214T140000Z DTSTAMP;VALUE=DATE-TIME:20130618T054626Z UID:indico-event-127301@cern.ch DESCRIPTION:\nI will summarize the status of the Higgs boson in the Standa rd Model and its supersymmetric extension with a focus on Higgs production at hadron colliders and the associated theoretical uncertainties. In part icular\, I will address (and question) the exclusion limits that have been recently set on its mass at the Tevatron. The prospects for Higgs product ion at the lHC (with 7 TeV c.m. energy and 1/fb data) will be summarized.\ n\nhttp://indico.cern.ch/conferenceDisplay.py?confId=127301 LOCATION:EPFL Cubotron 727 URL:http://indico.cern.ch/conferenceDisplay.py?confId=127301 END:VEVENT BEGIN:VEVENT SUMMARY:Emulating Quantum Magnetism and t--J Models in Systems of Ultracol d Polar Molecules DTSTART;VALUE=DATE-TIME:20110309T101500Z DTEND;VALUE=DATE-TIME:20110309T111500Z DTSTAMP;VALUE=DATE-TIME:20130618T054626Z UID:indico-event-130106@cern.ch DESCRIPTION:In contrast to atomic systems\, strong electric dipole-dipole interactions in systems of ultracold polar molecules open the way to direc tly emulate spin Hamiltonians at temperatures of the order of nK\, realiza ble in current experiments. At unit filling of the lattice\, this leads to $S=1/2$ XXZ-type of Hamiltonians\, while below unit filling a highly tuna ble generalization of the $t-J$ model is obtained which we refer to as the $t-J-V-W$ model. In addition to the long-range dipolar interactions of XX Z type ($J_z$ and $J_\\perp$) present at unit filling\, density-density in teractions $V$ and a novel density-spin interaction\n$W$ are obtained. The se interaction terms can all be tuned independently of the tunneling $t$ i n magnitude as well as in sign. The "spin" degrees of freedom are realized by addressing two rotational degrees of freedom of the molecules\, while the interactions are controlled by applying static electric and continuous -wave microwave fields. Using the DMRG we obtain the phase diagram for the experimentally relevant case $J_z=V=W=0$ in 1D and find that at low filli ng superconductivity is enhanced compared to the usual $t-J$ model. At int ermediate filling\, the numerical results indicate the presence of a new p hase with finite spin-gap\, dominant superconducting correlation functions \, but Luttinger parameter K<1 resembling repulsive interactions. We discu ss the possibility to use Bloch oscillations for the characterization of t he different ground states in non-equilibrium experiments on optical latti ces.\n\nhttp://indico.cern.ch/conferenceDisplay.py?confId=130106 LOCATION:EPFL Salle 727 du BSP URL:http://indico.cern.ch/conferenceDisplay.py?confId=130106 END:VEVENT BEGIN:VEVENT SUMMARY:Lattice studies of the conformal window DTSTART;VALUE=DATE-TIME:20110314T130000Z DTEND;VALUE=DATE-TIME:20110314T140000Z DTSTAMP;VALUE=DATE-TIME:20130618T054626Z UID:indico-event-131026@cern.ch DESCRIPTION:\nInfrared (IR) fixed points play an important role in buildin g models of strongly interacting BSM physics. We study the possibility of identifying IR fixed points\nusing numerical simulations of gauge theories . We discuss the tools that can be\nused\, the expected signals and the so urces of systematic errors.\n\nhttp://indico.cern.ch/conferenceDisplay.py? confId=131026 LOCATION:EPFL 727 du BSP URL:http://indico.cern.ch/conferenceDisplay.py?confId=131026 END:VEVENT BEGIN:VEVENT SUMMARY:“Strong coupling limit of interacting electrons in bi-layer grap hen. Joint cond-mat/hept-th seminar” DTSTART;VALUE=DATE-TIME:20110321T130000Z DTEND;VALUE=DATE-TIME:20110321T140000Z DTSTAMP;VALUE=DATE-TIME:20130618T054626Z UID:indico-event-131994@cern.ch DESCRIPTION:http://indico.cern.ch/conferenceDisplay.py?confId=131994 LOCATION:EPFL Cubotron 727 URL:http://indico.cern.ch/conferenceDisplay.py?confId=131994 END:VEVENT BEGIN:VEVENT SUMMARY:Thermal production of relativistic Majorana neutrinos: Strong enha ncement by multiple soft scattering DTSTART;VALUE=DATE-TIME:20110328T120000Z DTEND;VALUE=DATE-TIME:20110328T130000Z DTSTAMP;VALUE=DATE-TIME:20130618T054626Z UID:indico-event-132762@cern.ch DESCRIPTION:The production rate of heavy Majorana neutrinos is relevant fo r models of thermal leptogenesis in the early Universe. In the high temper ature limit the production can proceed via the 1 lt\;-gt\; 2 (inverse) dec ays which are allowed by the thermal masses.\nWe consider new production m echanisms which are obtained by including additional soft gauge interactio ns with the plasma. We show that an arbitrary number of such interactions gives leading order contributions\, and we sum all of them. The rate turns out to be smooth in the region where the 1 lt\;-gt\; 2 processes are kine matically forbidden. At higher temperature it is enhanced by a factor 3 co mpared to the 1 lt\;-gt\; 2 rate.\n\nhttp://indico.cern.ch/conferenceDispl ay.py?confId=132762 LOCATION:EPFL Cubotron 727 URL:http://indico.cern.ch/conferenceDisplay.py?confId=132762 END:VEVENT BEGIN:VEVENT SUMMARY:Lepton asymmetry and the cosmic QCD transition DTSTART;VALUE=DATE-TIME:20110516T120000Z DTEND;VALUE=DATE-TIME:20110516T130000Z DTSTAMP;VALUE=DATE-TIME:20130618T054626Z UID:indico-event-138517@cern.ch DESCRIPTION:We study the influence of lepton asymmetry on the evolution of the early Universe.  The lepton asymmetry l is poorly constrained by obs ervations and might be orders of magnitude larger than the baryon asymmetr y b\, |l|/b \n\nhttp://indico.cern.ch/conferenceDisplay.py?confId=138517 LOCATION:EPFL Cubotron 727\, EPFL URL:http://indico.cern.ch/conferenceDisplay.py?confId=138517 END:VEVENT BEGIN:VEVENT SUMMARY:A Motivated Non-Standard Supersymmetric Spectrum DTSTART;VALUE=DATE-TIME:20110620T120000Z DTEND;VALUE=DATE-TIME:20110620T130000Z DTSTAMP;VALUE=DATE-TIME:20130618T054626Z UID:indico-event-144019@cern.ch DESCRIPTION:In the context of Supersymmetry Phenomenology\, adopting a bot tom-up point of view and focussing on the lack of signals so far in the Hi ggs and in the flavour sectors\, we argue in favour of giving consideratio n to supersymmetric extensions of the Standard Model where the lightest Hi ggs boson has a mass between 200 and 300 GeV and the first two generations of s-fermions are in the range of several TeV. This\, in association with a pattern of flavour symmetry breaking centered on the special role of th e top and up-type Yukawa couplings\, leads to effective Minimal Flavour Vi olation of the Flavour Changing Neutral Current amplitudes. Moreover all t he phases allowed by the flavour symmetry can be sizable without violating existing Electric Dipole Moment constraints\, thus solving the SUSY CP pr oblem. We believe that this view strengthens the case for hierarchical sfe rmions.\n\nhttp://indico.cern.ch/conferenceDisplay.py?confId=144019 LOCATION:EPFL Cubotron 727 URL:http://indico.cern.ch/conferenceDisplay.py?confId=144019 END:VEVENT BEGIN:VEVENT SUMMARY:Dangerous Skyrmions in Little Higgs Models DTSTART;VALUE=DATE-TIME:20111003T120000Z DTEND;VALUE=DATE-TIME:20111003T130000Z DTSTAMP;VALUE=DATE-TIME:20130618T054626Z UID:indico-event-157258@cern.ch DESCRIPTION:Skyrmions are present in many models where the Higgs is a pseu do-Goldstone boson of a new global symmetry\, depending on the symmetry br eaking pattern. They are very heavy objects\, in the mass range 10-100 TeV \, and are stable over time. By performing the quantization of skyrmions i n the presence of gauge fields\, we show that the lightest skyrmion states tend to be electrically charged. On the other hand\, their small annihila tion cross-section make them long-lived\, which poses a serious problem fo r cosmology. This issue is present in most of the existing little Higgs mo dels. On the contrary\, composite Higgs models are typically free of this problem because of a trivial homotopy or due to the fact that the new ferm ions share the same quantum numbers as the standard model quarks.\n\nhttp: //indico.cern.ch/conferenceDisplay.py?confId=157258 LOCATION:EPFL\, Lausanne Cubotron 727\, EPFL URL:http://indico.cern.ch/conferenceDisplay.py?confId=157258 END:VEVENT BEGIN:VEVENT SUMMARY:Lattice-regularized spinor quantum gravity DTSTART;VALUE=DATE-TIME:20111017T120000Z DTEND;VALUE=DATE-TIME:20111017T130000Z DTSTAMP;VALUE=DATE-TIME:20130618T054626Z UID:indico-event-159140@cern.ch DESCRIPTION:If Cartan formulation of General Relativity is used\, as the p resence of fermions seems to force us to do\, none of the possible diffeom orphism-invariant terms in the action are sign-definite. This prevents one from defining quantum gravity in a nonperturbative sense when all quantum fluctuations of the metrics and of the connection\, including sign-changi ng ones are in principle allowed. A way out is to use a composite frame fi eld\, built as a bilinear "current" of more fundamental fermion (spinor) f ields. Path integrals over Grassmannian variables are well defined for wha tever sign of the fermion action. Thus in the ultraviolet limit quantum gr avity possesses only spinor and gauge field degrees of freedom\, like in t he Standard Model. The theory can be easily regularized by putting it on a space lattice. It is explicitly invariant under local Lorentz transformat ions and\, in the continuum limit\, under diffeomorphisms. It is a theory that is wellbehaved at small distances\, and quantum fluctuations are well defined. I discuss how to check if Newton's law is reproduced in the infr ared limit. Also\, this formulation of quantum gravity allows its unificat ion with the Standard Model\, and that will be also briefly discussed.\n\n http://indico.cern.ch/conferenceDisplay.py?confId=159140 LOCATION:EPFL Salle 727 BSP Cubotron URL:http://indico.cern.ch/conferenceDisplay.py?confId=159140 END:VEVENT BEGIN:VEVENT SUMMARY:Ground-State Phase Diagram of an Anisotropic S=2 Antiferromagnetic Quantum Spin Chain: Existence of Intermediate-D phase DTSTART;VALUE=DATE-TIME:20111018T141500Z DTEND;VALUE=DATE-TIME:20111018T151500Z DTSTAMP;VALUE=DATE-TIME:20130618T054626Z UID:indico-event-158131@cern.ch DESCRIPTION:http://indico.cern.ch/conferenceDisplay.py?confId=158131 LOCATION:CERN URL:http://indico.cern.ch/conferenceDisplay.py?confId=158131 END:VEVENT BEGIN:VEVENT SUMMARY:Exact studies of hybrid latticestatistical models of localized Isi ng spins and delocalized electrons DTSTART;VALUE=DATE-TIME:20111026T091500Z DTEND;VALUE=DATE-TIME:20111026T101500Z DTSTAMP;VALUE=DATE-TIME:20130618T054626Z UID:indico-event-159981@cern.ch DESCRIPTION:Two-dimensional lattice-statistical model\, which describes th e hybrid system of localized Ising spins and delocalized electrons\, is ex actly solved using the generalized decoration-iteration transformation whe n fixing the number of delocalized electrons per each couple of decorating sites. The ground state of the model with one electron delocalized over e ach couple of the decorating sites exhibits either a classical ferromagnet ic or ferrimagnetic spontaneous long-range ordering\, while the model with two delocalized electrons per each pair of the decorating sites displays a more striking four-sublattice quantum antiferromagnetic ordering with th e obvious quantum reduction of the staggered magnetization. The ground sta te\, critical behavior\, order parameter and basic thermodynamic quantitie s will be calculated and analyzed in dependence on a relative strength of the hopping term and the Ising-type exchange interaction.\n\nhttp://indico .cern.ch/conferenceDisplay.py?confId=159981 LOCATION:EPFL\, Lausanne 727 du BSP Cuotron URL:http://indico.cern.ch/conferenceDisplay.py?confId=159981 END:VEVENT BEGIN:VEVENT SUMMARY:Radiation Problem in Transplanckian Scattering DTSTART;VALUE=DATE-TIME:20111031T130000Z DTEND;VALUE=DATE-TIME:20111031T140000Z DTSTAMP;VALUE=DATE-TIME:20130618T054626Z UID:indico-event-160908@cern.ch DESCRIPTION:We investigate hard radiation emission in small-angle transpla nckian scattering. We show how to reduce this problem to a quantum field t heory computation in a classical background (gravitational shock wave). In momentum space\, the formalism is similar to the flat-space light cone pe rturbation theory\, with shock wave crossing vertices added. In the impact parameter representation\, the radiating particle splits into a multi-par ticle virtual state\, whose wavefunction is then multiplied by individual eikonal factors. As a phenomenological application\, we study QCD radiatio n in transplanckian collisions of TeV-scale gravity models. We derive the distribution of initial state radiation gluons\, and find a suppression at large transverse momenta with respect to the standard QCD result. This is due to rescattering events\, in which the quark and the emitted gluon sca tter coherently. Interestingly\, the suppression factor depends on the num ber of extra dimensions and thus in principle provides a new experimental handle to measure this number. We evaluate the leading-log corrections to partonic cross-sections due to the initial state radiation\, and prove tha t they can be absorbed into the hadronic PDF\, with a characteristic facto rization scale.\n\nhttp://indico.cern.ch/conferenceDisplay.py?confId=16090 8 LOCATION:EPFL Lausanne Cubotron 727 URL:http://indico.cern.ch/conferenceDisplay.py?confId=160908 END:VEVENT BEGIN:VEVENT SUMMARY:Ultrastrong Coupling Circuit QED Systems DTSTART;VALUE=DATE-TIME:20120118T131500Z DTEND;VALUE=DATE-TIME:20120118T141500Z DTSTAMP;VALUE=DATE-TIME:20130618T054626Z UID:indico-event-172371@cern.ch DESCRIPTION:In cavity quantum electrodynamics (QED)\, the interaction betw een an atomic transition and the cavity field is measured by the vacuum Ra bi frequency Ω0. The analogous term circuit QED has been introduced for J osephson junctions\, because superconducting circuits can behave as artifi cial atoms coupled to the bosonic field of a resonator. In the regime with Ω0 comparable to the two-level transition frequency\, superradiant quant um phase transitions for the cavity vacuum have been predicted\, e.g. with in the Dicke model. In this seminar\, possible implementations of the Dick e model in circuit QED systems will be theoretically investigated for diff erent kind of Josephson atoms\, both in the case of capacitive [1] and ind uctive [2] coupling. In the thermodynamic limit of a large number of artif icial atoms\, predictions and constraints are explored for the occurrence of the quantum phase\ntransition\, with a doubly degenerate vacuum (ground state) and a spontaneous photonic coherence above a quantum critical coup ling. In the finite-size case\, the robustness and protection of the vacuu m degeneracy in the ultrastrong coupling regime are studied [2]\, leading to possible applications for Quantum Computation using multiple resonators [3]. Finally\, a generalized Dicke model is proposed for which a doubly s uperradiant phase with four degenerate vacua is predicted [4].\n\nhttp://i ndico.cern.ch/conferenceDisplay.py?confId=172371 LOCATION:CERN URL:http://indico.cern.ch/conferenceDisplay.py?confId=172371 END:VEVENT BEGIN:VEVENT SUMMARY:Magnetic frustration : between micro and macro levels DTSTART;VALUE=DATE-TIME:20120208T101500Z DTEND;VALUE=DATE-TIME:20120208T111500Z DTSTAMP;VALUE=DATE-TIME:20130618T054626Z UID:indico-event-176557@cern.ch DESCRIPTION:I will discuss theoretically two recent examples of frustrated magnetic systems. The first example concerns an XY pyrochlore antiferroma gnet Er2Ti2O7. This frustrated magnet orders into an unusual noncoplanar m agnetic structure. I show how such a spin state is stabilized by quantum o rder from disorder mechanism. An interesting signature of the above mechan ism is presence of an "acoustic" mode in this strongly anisotropic antifer romagnet. In the second example I consider ferro- antiferromagnetic bilaye rs\, which are widely used in the field of Spintronics. In the case of a c ompensated antiferromagnetic interface the coupling between the two layers vanishes in the mean-field approximation. I discuss how the canting of th e antiferromagnetic structure lifts the degeneracy and how the mutual orie ntation of the antiferromagnetic order parameter and the ferromagnetic mag netization changes with temperature.\n\nhttp://indico.cern.ch/conferenceDi splay.py?confId=176557 LOCATION:EPFL Salle 727 Cubotron URL:http://indico.cern.ch/conferenceDisplay.py?confId=176557 END:VEVENT BEGIN:VEVENT SUMMARY:Cosmological neutrino mass constraint from the WiggleZ Dark Eergy Durvey DTSTART;VALUE=DATE-TIME:20120308T130000Z DTEND;VALUE=DATE-TIME:20120308T140000Z DTSTAMP;VALUE=DATE-TIME:20130618T054626Z UID:indico-event-180734@cern.ch DESCRIPTION:http://indico.cern.ch/conferenceDisplay.py?confId=180734 LOCATION:EPFL URL:http://indico.cern.ch/conferenceDisplay.py?confId=180734 END:VEVENT BEGIN:VEVENT SUMMARY:On loop corrections in thermal paticle production DTSTART;VALUE=DATE-TIME:20120319T130000Z DTEND;VALUE=DATE-TIME:20120319T140000Z DTSTAMP;VALUE=DATE-TIME:20130618T054626Z UID:indico-event-182503@cern.ch DESCRIPTION:http://indico.cern.ch/conferenceDisplay.py?confId=182503 LOCATION:EPFL\, Lausanne Cubotron 727 URL:http://indico.cern.ch/conferenceDisplay.py?confId=182503 END:VEVENT BEGIN:VEVENT SUMMARY:Inflationary magnetic fields spoil the homogeneity and isotropy of the Universe DTSTART;VALUE=DATE-TIME:20120326T120000Z DTEND;VALUE=DATE-TIME:20120326T130000Z DTSTAMP;VALUE=DATE-TIME:20130618T054626Z UID:indico-event-183696@cern.ch DESCRIPTION:I shall show that magnetic fields generated during inflation\, if they are sufficient to provide the seeds for the observed large scale fields in galaxies\, clusters and voids\, generically lead to large metric fluctuations during the subsequent radiation era. The ratio of the Weyl t ensor generated from magnetic fields during inflation to the Ricci\ntensor grows in the radiation dominated era to become larger than unity. This is in flagrant contradiction with the homogeneity and isotropy of the observ ed Universe\n\nhttp://indico.cern.ch/conferenceDisplay.py?confId=183696 LOCATION:EPFL Cubotron 727 URL:http://indico.cern.ch/conferenceDisplay.py?confId=183696 END:VEVENT BEGIN:VEVENT SUMMARY:Light Custodians and Higgs Physics in Composite Models DTSTART;VALUE=DATE-TIME:20120402T120000Z DTEND;VALUE=DATE-TIME:20120402T130000Z DTSTAMP;VALUE=DATE-TIME:20130618T054626Z UID:indico-event-184800@cern.ch DESCRIPTION:\n Composite Higgs models involving partial compositeness of S tandard Model fermions typically require the introduction of fermionic pa rtners which are relatively light in realistic scenarios. In this paper\, we analyze the role of these light custodian fermions in the phenomenolo gy of the composite Higgs models and show that they significantly modify couplings of the Higgs field. We focus on the coupling to gluons in partic ular\, which is of central importance for Higgs production at the LHC. We show that this coupling can be increased as well as decreased depending on the SM fermion embedding in the composite multiplets. We also discuss modification of the Higgs couplings to bottom and top quarks and show tha t modifications to all these three couplings Hgg\, Htt\, and Hbb are gene rically independent parameters.\n\nhttp://indico.cern.ch/conferenceDisplay .py?confId=184800 LOCATION:EPFL\, Lausanne Cubotron 727 EPFL URL:http://indico.cern.ch/conferenceDisplay.py?confId=184800 END:VEVENT BEGIN:VEVENT SUMMARY:Neutrino oscillation phenomenology with large 013 DTSTART;VALUE=DATE-TIME:20120416T120000Z DTEND;VALUE=DATE-TIME:20120416T130000Z DTSTAMP;VALUE=DATE-TIME:20130618T054626Z UID:indico-event-186697@cern.ch DESCRIPTION:I will review the present status and future prospects of neutr ino oscillation experiments.  The large value of \n\nhttp://indico.cern.c h/conferenceDisplay.py?confId=186697 LOCATION:EPFL Cubotron 727 URL:http://indico.cern.ch/conferenceDisplay.py?confId=186697 END:VEVENT BEGIN:VEVENT SUMMARY:Field-induced p-wave Superconductivity in Mesoscopic Superconducti vity DTSTART;VALUE=DATE-TIME:20120502T091500Z DTEND;VALUE=DATE-TIME:20120502T101500Z DTSTAMP;VALUE=DATE-TIME:20130618T054626Z UID:indico-event-187496@cern.ch DESCRIPTION:http://indico.cern.ch/conferenceDisplay.py?confId=187496 LOCATION:EPFL Salle 727 du BSP\, EPFL URL:http://indico.cern.ch/conferenceDisplay.py?confId=187496 END:VEVENT BEGIN:VEVENT SUMMARY:Genomic challenges and computational answers in evolutionary biolo gy DTSTART;VALUE=DATE-TIME:20120507T120000Z DTEND;VALUE=DATE-TIME:20120507T130000Z DTSTAMP;VALUE=DATE-TIME:20130618T054626Z UID:indico-event-189819@cern.ch DESCRIPTION:Genomic data is accumulating exponentially. This presents both a major challenge\, to make sense of these data\, and a major opportunity \, to learn more about biology.\nEvolutionary biology plays a key role in this endeavor\, because of the traditional importance of comparative appro aches. By comparing many genomes\, we can learn more about each genome\, a s well as about broad evolutionary patterns at the genomic level. Scaling up this approach presents computational challenges from ontology usage to distributed computing. I will focus on the detection of Darwinian selectio n\, and on the role of gene duplication.\n\nhttp://indico.cern.ch/conferen ceDisplay.py?confId=189819 LOCATION:EPFL Cubotron 727 URL:http://indico.cern.ch/conferenceDisplay.py?confId=189819 END:VEVENT BEGIN:VEVENT SUMMARY:Higgs Hunter's Digest DTSTART;VALUE=DATE-TIME:20120514T120000Z DTEND;VALUE=DATE-TIME:20120514T130000Z DTSTAMP;VALUE=DATE-TIME:20130618T054626Z UID:indico-event-191200@cern.ch DESCRIPTION:I’ll review recent Higgs data from the LHC and discuss ways in which modelindependent conclusions can be drawn. The bottom-up thinking that goes into this can help to determine what other new physics we might anticipate finding at accessible scales\, while allowing us to assess eme rging proposals for the origins of the hinted Higgs-like state at 125 GeV. Using composite Higgs and the MSSM as two case studies\, I’ll discuss t he benefits of constructing these generalized exclusions and describe some very general conclusions that they will help to illuminate with current a nd future data.\n\nhttp://indico.cern.ch/conferenceDisplay.py?confId=19120 0 LOCATION:EPFL\, Lausanne Cubotron 727 URL:http://indico.cern.ch/conferenceDisplay.py?confId=191200 END:VEVENT BEGIN:VEVENT SUMMARY:Exploring the Higgs portal with the first LHC data DTSTART;VALUE=DATE-TIME:20120605T120000Z DTEND;VALUE=DATE-TIME:20120605T130000Z DTSTAMP;VALUE=DATE-TIME:20130618T054626Z UID:indico-event-194188@cern.ch DESCRIPTION:In light of the LHC Higgs boson data presented at Moriond\, we analyse the impact of new exotic colored and charged matter fields intera cting through the Higgs portal with the Standard Model Higgs boson. This a dditional matter can induce New Physics (NP) effects in the LHC Higgs gold en channel in the low mass range: a Higgs produced in gluon-gluon fusion a nd decaying to two photons. We determine the parameter space that is best fitting the current LHC Higgs data (both for a Higgs at around 125 GeV and for a heavy underproduced Higgs)\, and compare with complementary LHC sea rches that are sensitive to the direct production of the NP colored states . The effects of the additional matter in the global fit of the electrowea k observables are also discussed.\n\nhttp://indico.cern.ch/conferenceDispl ay.py?confId=194188 LOCATION:EPFL\, Lausanne Cubotron 727 URL:http://indico.cern.ch/conferenceDisplay.py?confId=194188 END:VEVENT BEGIN:VEVENT SUMMARY:Field-induced thermal transport in BEC antiferromagnets DTSTART;VALUE=DATE-TIME:20120611T091500Z DTEND;VALUE=DATE-TIME:20120611T101500Z DTSTAMP;VALUE=DATE-TIME:20130618T054626Z UID:indico-event-195133@cern.ch DESCRIPTION:Recent experiments in BEC quantum magnets exhibit a dramatic e volution of the thermal conductivity of these materials in magnetic field. By considering various relaxation mechanisms of bosonic excitations in th e vicinity of the BEC quantum-critical point at finite temperature we prov ide a detailed explanation of several unusual features of the data. We ide ntify the leading impurity-scattering interaction and demonstrate that its renormalization due to quantum fluctuations of the paramagnetic state com pensates the related mass renormalization effect. This explains the enigma tic absence of the asymmetry between the two critical points in the low-T thermal conductivity data\, while such an asymmetry is prominent in many o ther physical quantities. The observed characteristic "migration'' of the peak in thermal conductivity away from the transition points as a function of temperature is explained as due to a competition between an increase i n the number of heat carriers and an enhancement of their mutual scatterin g. An important role of the three-boson scattering processes within the or dered phase of these systems is also discussed. Other qualitative and quan titative features of the experiment are clarified and the future direction s are sketched.\n\nhttp://indico.cern.ch/conferenceDisplay.py?confId=19513 3 LOCATION:EPFL EPFL\, Salle 727 URL:http://indico.cern.ch/conferenceDisplay.py?confId=195133 END:VEVENT BEGIN:VEVENT SUMMARY:Quantum Phase Transitions and Hidden Orders in Low-Dimensional Spi n Systems DTSTART;VALUE=DATE-TIME:20120613T091500Z DTEND;VALUE=DATE-TIME:20120613T101500Z DTSTAMP;VALUE=DATE-TIME:20130618T054626Z UID:indico-event-195134@cern.ch DESCRIPTION:According to the conventional Landau theory\, phases are disti nct due to their different symmetries\, and a phase transition is always r elated to a symmetry breaking of the Hamiltonian. The order is described b y appropriately chosen local long-range order parameter(s). However\, ther e is a mounting number of examples where the phases and transitions cannot be described by the explicit symmetry breaking and/or local order paramet er(s). I will review several known examples of the classical and quantum s ystems of such type. Then I will discuss our work on the transitions and h idden orders in the dimerized two- and three-leg spin-1/2 ladders. The res ults of both the mean-field theory and the exact diagonalization technique will be presented. It is shown that the columnar\ndimerization pattern is never critical\, whereas the staggered configuration possesses a\nquantum critical point. Various gapped phases cannot be distinguished by the loca l Landau\norder parameter\, but they possess non-local topological string order parameters. We\ncalculate energies\, gaps\, string order parameters\ , and yield estimates of the critical\nexponents ν and β. Directions of the future work will be also discussed.\n\nhttp://indico.cern.ch/conferenc eDisplay.py?confId=195134 LOCATION:EPFL EPFL\, Salle 727 du BSP URL:http://indico.cern.ch/conferenceDisplay.py?confId=195134 END:VEVENT BEGIN:VEVENT SUMMARY:Sterile neutrino\, hidden warm dark matter and their cosmological signatures DTSTART;VALUE=DATE-TIME:20120619T120000Z DTEND;VALUE=DATE-TIME:20120619T130000Z DTSTAMP;VALUE=DATE-TIME:20130618T054626Z UID:indico-event-196267@cern.ch DESCRIPTION:We explore the model-independent constraints from cosmology on a dark-matter particle with no prominent standard model interactions that interacts and thermalizes with other particles in a hidden sector. We cha racterize the relevant physics by the annihilation cross section\, mass\, and temperature ratio of the hidden to visible sectors.\nWhile encompassin g the standard cold WIMP scenario\, we do not require the freeze-out proce ss to be nonrelativistic. Rather\, freeze-out may also occur when dark mat ter particles are semirelativistic. This gives a possibility of warm dark matter as thermal relic in hidden sector. A keV sterile neutrino which is not in thermal contact with stanard model but thermalized in a dark sector \, is a good example for this. We consider different cosmological constrai nts on such scenario and show that for warm dark matter masses \n\nhttp:// indico.cern.ch/conferenceDisplay.py?confId=196267 LOCATION:EPFL EPFL\, Cubotron 727 URL:http://indico.cern.ch/conferenceDisplay.py?confId=196267 END:VEVENT BEGIN:VEVENT SUMMARY:“Conformal mechanisms of generation of cosmological density pert urbations” DTSTART;VALUE=DATE-TIME:20120706T120000Z DTEND;VALUE=DATE-TIME:20120706T130000Z DTSTAMP;VALUE=DATE-TIME:20130618T054626Z UID:indico-event-198184@cern.ch DESCRIPTION:In inflationary models\, the approximate flatness of the pow er spectrum of primordial scalar perturbations is a consequence of the app roximate de Sitter symmetry. We discuss an alternative possibility that th e relevant symmetry is (approximate) conformal invariance. We illustrate t he conformal scenario by toy model examples\, and then\ndiscuss its featur es arising at non-linear level. These are specific to the whole class of conformal models and give rise to potentially observable properties of the scalar perturbations\, such as statistical anisotropy and particular form of non-Gaussianity.\n\nhttp://indico.cern.ch/conferenceDisplay.py?confId= 198184 LOCATION:EPFL EPFL\, Cubotron 727 URL:http://indico.cern.ch/conferenceDisplay.py?confId=198184 END:VEVENT BEGIN:VEVENT SUMMARY:Exact Kohn-Sham eigenstates versus quasi-particles in simple model s of strongly correlatedelectrons DTSTART;VALUE=DATE-TIME:20121017T091500Z DTEND;VALUE=DATE-TIME:20121017T101500Z DTSTAMP;VALUE=DATE-TIME:20130618T054626Z UID:indico-event-212737@cern.ch DESCRIPTION:We present analytic expressions for the exact density function al and Kohn-Sham Hamiltonian of simple tight-binding models of correlated electrons. These are the single- and double-site versions of the Anderson\ , Hubbard and spinless fermion models. The exact exchange and correlation potentials are fully non-local. The analytic expressions allow to compare the Kohn-Sham eigenstates of exact density functional theory with the many -body quasi-particle states of these correlated-electron systems. The exac t Kohn-Sham spectrum describes correctly many of the non-trivial features of the many-body quasi-particle spectrum\, as for example the precursors o f the Kondo peak. However\, we find that some pieces of the quasi-particle spectrum are missing because the many-body phase-space for electron and h ole excitations is richer.\n\nhttp://indico.cern.ch/conferenceDisplay.py?c onfId=212737 LOCATION:EPFL 727 du BSP\, EPFL URL:http://indico.cern.ch/conferenceDisplay.py?confId=212737 END:VEVENT BEGIN:VEVENT SUMMARY:The Universe at Planck scale – An attempt to formulate a theory of quantum gravity DTSTART;VALUE=DATE-TIME:20121029T130000Z DTEND;VALUE=DATE-TIME:20121029T140000Z DTSTAMP;VALUE=DATE-TIME:20130618T054626Z UID:indico-event-215007@cern.ch DESCRIPTION:Following the Wilsonian approach to quantum field theory\, we try to formulate a lattice quantum field theory of gravity\, where short d istance physics should be associated with an ultraviolet fixed point and a flow away from such a fixed point should lead to a universe like the one we observe today. You will get a status report.\n\nhttp://indico.cern.ch/c onferenceDisplay.py?confId=215007 LOCATION:EPFL Cubotron 727 URL:http://indico.cern.ch/conferenceDisplay.py?confId=215007 END:VEVENT BEGIN:VEVENT SUMMARY:The Hottest\, and most Liquid\, Liquid in the Universe DTSTART;VALUE=DATE-TIME:20121102T070000Z DTEND;VALUE=DATE-TIME:20121102T080000Z DTSTAMP;VALUE=DATE-TIME:20130618T054626Z UID:indico-event-216185@cern.ch DESCRIPTION:Before experiments at the Relativistic Heavy Ion Collider star ted recreating little droplets of the matter that filled the microseconds- old universe\, this stuff was thought to be a tenuous gas-like plasma. Now we know from experiments at RHIC and at the Large Hadron Collider that at these extreme temperatures nature serves up hot quark soup — the hottes t liquid in the universe and the liquid that flows with the\nleast dissipa tion. The only other comparably liquid liquid is the coldest liquid in the universe\, namely the fluid made of trapped fermionic atoms at microKelvi n rather than TeraKelvin temperatures. These are two examples of strongly coupled fluids without any apparent quasiparticle description. I will desc ribe how physicists are using RHIC and LHC experiments — as well as calc ulations done using dualities between liquids and black holes discovered i n string theory — to discern the properties of hot quark soup. In this d omain\, string theory is answering questions posed by laboratory experimen ts. I will describe the opportunities and challenges for coming experiment s\nat RHIC and the LHC\, among them understanding how a liquid with no app arent particulate description emerges from quarks and gluons\, searching f or a critical point in the QCD phase diagram and\, maybe\, taking snapshot s of QCD sphalerons.\n\nhttp://indico.cern.ch/conferenceDisplay.py?confId= 216185 LOCATION:EPFL EPFL\, Cubotron 727 URL:http://indico.cern.ch/conferenceDisplay.py?confId=216185 END:VEVENT BEGIN:VEVENT SUMMARY:Instabilities of the Landau-Fermi liquid in lattice systems DTSTART;VALUE=DATE-TIME:20121121T101500Z DTEND;VALUE=DATE-TIME:20121121T111500Z DTSTAMP;VALUE=DATE-TIME:20130618T054626Z UID:indico-event-218147@cern.ch DESCRIPTION:We present a new method to detect Fermi surface instabilities for interacting systems at finite temperature. We first apply it to a list of toy-models\, recovering already known results in a very economic way\, and obtaining most of the information on the phase diagram analytically. As an example\, in the continuum limit we obtain the critical temperature as an implicit function of the magnetic field and the chemical potential T c(mu\, h). By applying the method to a model proposed to describe reentran t behavior in Sr3Ru2O7\, we reproduce the phase diagram obtained experimen tally and show the presence of a non-Fermi Liquid region at temperatures a bove the nematic phase.\n\nhttp://indico.cern.ch/conferenceDisplay.py?conf Id=218147 LOCATION:EPFL EPFL\, Room 727\, BSP URL:http://indico.cern.ch/conferenceDisplay.py?confId=218147 END:VEVENT BEGIN:VEVENT SUMMARY:Signatures of Naturalness at the LHC DTSTART;VALUE=DATE-TIME:20121203T130000Z DTEND;VALUE=DATE-TIME:20121203T140000Z DTSTAMP;VALUE=DATE-TIME:20130618T054626Z UID:indico-event-220440@cern.ch DESCRIPTION:After the Higgs discovery\, the next target for the LHC is Nat uralness: its flagships being composite Higgs and supersymmetric models. I will show that\, albeit for different reasons\, characteristic features o f both scenarios include new states below the TeV and modifications of the Higgs couplings to Standard Model fields\, both of which can be observed at the LHC.\n\nhttp://indico.cern.ch/conferenceDisplay.py?confId=220440 LOCATION:EPFL EPFL\, Cubotron 727 URL:http://indico.cern.ch/conferenceDisplay.py?confId=220440 END:VEVENT BEGIN:VEVENT SUMMARY:Possible many-body localization in the dynamics of correlated syst ems DTSTART;VALUE=DATE-TIME:20130213T101500Z DTEND;VALUE=DATE-TIME:20130213T111500Z DTSTAMP;VALUE=DATE-TIME:20130618T054626Z UID:indico-event-235281@cern.ch DESCRIPTION:When classical systems fail to explore their entire configurat ional space\, intriguing macroscopic phenomena like aging and glass format ion may emerge. Also closed quanto-mechanical systems may stop wandering f reely around the whole Hilbert space\, even if they are initially prepared into a macroscopically large combination of eigenstates. Here\, we report numerical evidences that the dynamics of strongly interacting lattice bos ons driven sufficiently far from equilibrium can be trapped into extremely long-lived inhomogeneous metastable states. The slowing down of incoheren t density excitations above a threshold energy\, much reminiscent of a dyn amical arrest on the verge of a glass transition\, is identified as the ke y feature of this phenomenon.\nWe argue that the resulting long-lived inho mogeneous pattern is in turn responsible for the lack of thermalization ob served in large finite size systems. Such a rich phenomenology could be ex perimentally uncovered upon probing the out-ofequilibrium dynamics of conv eniently prepared quantum states of trapped cold atoms which we hereby sug gest.[1]\n\nhttp://indico.cern.ch/conferenceDisplay.py?confId=235281 LOCATION:EPFL EPFL\, 727 du BSP URL:http://indico.cern.ch/conferenceDisplay.py?confId=235281 END:VEVENT BEGIN:VEVENT SUMMARY:Standard Model Higgs and Inflationary Cosmology DTSTART;VALUE=DATE-TIME:20130311T130000Z DTEND;VALUE=DATE-TIME:20130311T140000Z DTSTAMP;VALUE=DATE-TIME:20130618T054626Z UID:indico-event-239561@cern.ch DESCRIPTION:The discovery of the standard model Higgs-like boson at LHC gi ves us an opportunity for the first time to discuss how far the birth and evolution of the Universe can be explained by the known physics. In partic ular\, the possibility that the SM Higgs field itself drives the primordia l inflation has not been ruled out yet\, although it becomes\nimpossible i n many parameter region due to the negative Higgs quartic coupling at high er energy scales. In this talk\, I discuss the variations of the ”Higgs inflation models” in the context of the generalized Galileons. I also di scuss how to avoid the Electroweak vacuum instability problem in the case of negative Higgs quartic coupling in high scale inflation that may be fav ored by the forthcoming data release of Planck.\n\nhttp://indico.cern.ch/c onferenceDisplay.py?confId=239561 LOCATION:EPFL EPFL\, Cubotron 727 URL:http://indico.cern.ch/conferenceDisplay.py?confId=239561 END:VEVENT BEGIN:VEVENT SUMMARY:Strongly interacting fermions in one-dimensional confinement DTSTART;VALUE=DATE-TIME:20130408T121500Z DTEND;VALUE=DATE-TIME:20130408T131500Z DTSTAMP;VALUE=DATE-TIME:20130618T054626Z UID:indico-event-245533@cern.ch DESCRIPTION:In one dimension\, strongly interacting quantum particles have attracted a lot of attention for over than 50 years. Some celebrated resu lts are the Tonks-Girardeau gas and the Lieb-Liniger models. Recent advanc es in cold atoms have enabled the study of one-dimensional bosons with str ong repulsive or attractive interactions allowing the exploration of these models in more detail. I will consider the case of fermionic particles in one dimension with strong short-range interactions in an external potenti al and describe a way to approach the general solution from a few-body poi nt of view.\n\nhttp://indico.cern.ch/conferenceDisplay.py?confId=245533 LOCATION:EPFL Auditoire 1\, EPFL URL:http://indico.cern.ch/conferenceDisplay.py?confId=245533 END:VEVENT BEGIN:VEVENT SUMMARY:Cold atoms\, the Efimov effect and limit cycles DTSTART;VALUE=DATE-TIME:20130415T120000Z DTEND;VALUE=DATE-TIME:20130415T130000Z DTSTAMP;VALUE=DATE-TIME:20130618T054626Z UID:indico-event-247073@cern.ch DESCRIPTION:I discuss a quantum field theoretic description of strongly in teracting cold atoms based on the non-perturbative renormalization group. For identical bosons or fermionic atoms with three components one finds an infinite set of three-body bound states (Efimov effect). It arises from a periodic scale-dependence of the running couplings. I also comment on rec ent experimental tests using ultracold atoms. Extending the calculation to nonzero density and temperature one finds that a “trion phase” separa tes a “Color superfluid”-BCS and a -BEC phase with interesting quantum phase transitions for T=0.\n\nhttp://indico.cern.ch/conferenceDisplay.py? confId=247073 LOCATION:EPFL EPFL\, Cubotron 727 URL:http://indico.cern.ch/conferenceDisplay.py?confId=247073 END:VEVENT BEGIN:VEVENT SUMMARY:Symmetry-protected topological phases of alkaline-earth cold fermi onic atoms in one dimension DTSTART;VALUE=DATE-TIME:20130419T060000Z DTEND;VALUE=DATE-TIME:20130419T070000Z DTSTAMP;VALUE=DATE-TIME:20130618T054626Z UID:indico-event-248199@cern.ch DESCRIPTION:Topological ordered phases have attracted much interest over t he years. In one dimension (1D)\, the concept of topological phases is not so well defined since all gapful 1D phase have short-range entanglement. However\, in presence of a symmetry\, a gapful phase might be different fr om a trivial phase. In this respect\, one defines the class of symmetry-pr otected topological (SPT) phase introduced by Wen et al. In this talk\, we will discuss the possible stabilization of 1D SPT phases in the context o f cold fermions based on alkaline-earth or ytterbium atoms loaded into 1D optical lattice. By means of complementary techniques\, we will show that new SPT phases\, with higher SU(N) symmetry\, emerge. Such phases turn out to be the generalization of the famous Haldane phase of the spin-1 SU(2) Heisenberg chain.\n\nhttp://indico.cern.ch/conferenceDisplay.py?confId=248 199 LOCATION:EPFL\, Auditoire du BSP Cubotron URL:http://indico.cern.ch/conferenceDisplay.py?confId=248199 END:VEVENT BEGIN:VEVENT SUMMARY:Quantum Ising dynamics and Majorana-like edge modes in the Rabi la ttice model DTSTART;VALUE=DATE-TIME:20130606T091500Z DTEND;VALUE=DATE-TIME:20130606T101500Z DTSTAMP;VALUE=DATE-TIME:20130618T054626Z UID:indico-event-255458@cern.ch DESCRIPTION:We present a case for the realization of Majorana-like fermion modes\, through the quantum Ising (QI) dynamics\, in the Rabi lattice. A Rabi lattice is an array of the Rabi quantum cavities where each cavity ha s a two-level atom (or a spin-1/2) coupled via dipole interaction to a sin gle photon (bosonic) mode\, and the inter-cavity coupling causes photon ho pping. We show that the Rabi lattice model rigorously tends to the QI mode l in the limit of strong atom-photon coupling. This QI dynamics drives the para- to ferro-electric quantum phase transition in the Rabi lattice\, an d also guarantees two Majorana-like edge fermions in the ordered phase in one dimension (on an open chain). We identify an observable signature of t hese modes\, and check their stability against the detrimental perturbatio ns such as a stray electric field. We find that the QI Majorana modes are not as fragile as one believed\, despite no topological protection.\n\nhtt p://indico.cern.ch/conferenceDisplay.py?confId=255458 LOCATION:EPFL. SAlle 727 du BSP EPFL. SAlle 727 du BSP URL:http://indico.cern.ch/conferenceDisplay.py?confId=255458 END:VEVENT END:VCALENDAR