Conveners
Particle Cosmology
- Benjamin Safdi (massachusetts institute of technology)
Particle Cosmology
- Yuhsin Tsai (UC Davis)
Particle Cosmology
- Harry Nelson
Particle Cosmology
- Matthew Kleban (New York University)
Particle Cosmology
- Jing Shu (Institute of Theoretical Physics, Chinese Academy of Science)
Particle Cosmology
- Priscilla Pani (Stockholm University (SE))
Particle Cosmology
- Raphael Flauger (The University of Texas at Austin)
Particle Cosmology
- Haipeng An (Caltech)
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Zachary Thomas24/08/2015, 14:50Particle Cosmology Theory and ExperimentWhen multiple sectors break supersymmetry, there is a corresponding multiplicity of goldstini, which may comprise some or all of the dark matter in our universe. In this talk, we identify a previously overlooked goldstino decay channel which leads to a smoking gun photon line signature. This new contribution can be interpreted as arising either from a supersymmetry-breaking Fayet-Iliopoulos...Go to contribution page
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Adam Coogan (UC Santa Cruz)24/08/2015, 15:10Particle Cosmology Theory and ExperimentWe investigate the relation between the annihilation of dark matter (DM) particles into lepton pairs and into 2-body final states including one or two photons. We parametrize the DM interactions with leptons in terms of contact interactions, and calculate the loop-level annihilation into monochromatic gamma rays, specifically computing the ratio of the DM annihilation cross sections into two...Go to contribution page
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Chiara Arina (University of Amsterdam)24/08/2015, 15:30Particle Cosmology Theory and ExperimentIn this talk we present the phenomenology of a mostly right-handed sneutrino as the lightest supersymmetric particle (LSP) and dark matter candidate. We focus our attention on indirect detection signals such as enhanced monochromatic neutrino lines in the reach of future neutrino probe. Furthermore we illustrate the complementarity between indirect and direct detection of sneutrino LSP with...Go to contribution page
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Benjamin Safdi (massachusetts institute of technology)24/08/2015, 16:30Particle Cosmology Theory and ExperimentWe present a new method to characterize unresolved point sources (PSs), which generalizes traditional template fits to account for non-Poissonian photon statistics. Using Fermi Large-Area Telescope gamma-ray data, we use the method to characterize PS populations at high latitudes and in the Inner Galaxy. We find that PSs (resolved and unresolved) account for $\sim$50% of the total...Go to contribution page
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Andrew Williams (NCBJ)24/08/2015, 16:50Particle Cosmology Theory and ExperimentWe analyse the sensitivity of the future Cherenkov Telescope Array (CTA) experiment to dark matter annihilations in the galactic centre using the most up to date instrument response functions and background simulation model provided by the CTA Collaboration. We systematically examine the different statistical methods for setting limits using CTA and provide a realistic assessment of the...Go to contribution page
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Flip Tanedo (UC Irvine)24/08/2015, 17:10Particle Cosmology Theory and ExperimentWe propose a novel search for dark matter using the directional capabilities of the AMS-02 telescope to identify dark photons coming from dark matter annihilation. Dark matter collects in the core of the Sun and annihilates into dark photons which then decay to known particles on their way to the Earth. For weak-scale dark matter, dark photons of mass MeV -- GeV, and kinematic mixing...Go to contribution page
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Mauro Valli24/08/2015, 17:30Particle Cosmology Theory and ExperimentDwarf spheroidal galaxies (dSphs) are among the faintest objects observed in our Universe, representing an ideal laboratory for Dark Matter (DM) searches. We review moment-based methods to model pressure-supported spherical systems like dSphs, and critically revisit the so called โmass-anisotropy degeneracy problemโ, plaguing the mass profile determination of these galaxies. We propose a...Go to contribution page
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Yiming Zhong (Stony Brook University)24/08/2015, 17:50Particle Cosmology Theory and ExperimentThe evolution of galactic dark matter halos would be modified if dark matter were self-interacting. The early heat conduction from the halo envelope to the core would enlarge the core size and reduce the central cusps. The late heat conduction from the core to the envelope would collapse the core into a singular state. Previous studies have focused on constraining the velocity independent...Go to contribution page
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Chris Tunnell (Nikhef)25/08/2015, 14:30Particle Cosmology Theory and ExperimentThe XENON program has helped develop the two-phase xenon time-projection-chamber technology into the most powerful means of directly detecting WIMPs. The program currently consists of the XENON100 and XENON1T experiments. The XENON100 experiment completed 225 live-days of data taking in 2012 that resulted, at the time, in the most stringent spin-independent elastic-scattering constrain on...Go to contribution page
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Prof. Matthew Szydagis (University at Albany)25/08/2015, 14:50Particle Cosmology Theory and ExperimentThe LUX collaboration has recently re-analyzed its initial WIMP search data, and it continues to lead the search for dark matter candidate particles in the *O*(10-1,000) GeV mass range since the first analysis was released. LUX performs several advanced *in situ* nuclear and electron calibrations of the light and charge yields down to 1 keV of recoil energy, avoiding the need to extrapolate...Go to contribution page
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Maria Elena Monzani (SLAC)25/08/2015, 15:10Particle Cosmology Theory and ExperimentThe nature and origin of Dark Matter is one of the most compelling mysteries of contemporary science. For over two decades, physicists have been trying to detect Dark Matter particles via collisions on target nuclei, with little success. The LZ collaboration is designing a massive Dark Matter detector, to be installed at the 4850 level of the Sanford Underground Research Facility in Lead,...Go to contribution page
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Dr Benjamin Smith (TRIUMF)25/08/2015, 15:30Particle Cosmology Theory and ExperimentDEAP-3600 is a dark matter experiment at SNOLAB in Ontario, Canada, using 3600kg of liquid argon to search for spin-independent interactions of Weakly Interacting Massive Particles (WIMPs). The experiment uses pulse shape discrimination to separate WIMP-like nuclear recoils from the electronic recoils caused by most background events. Nuclear recoils produce more prompt scintillation light...Go to contribution page
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Leonardo Senatore (Stanford University)25/08/2015, 16:30Particle Cosmology Theory and ExperimentThe Effective Field Theory of Large Scale Structures (EFTofLSS) is a novel research program that aims at developing a systematic understanding of large scale structures at long distances by expanding in the smallness of the long wavelength perturbations. This program is particular relevant given the importance of large scale structure surveys for our progress in cosmological information in the...Go to contribution page
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Aoife BHARUCHA (Universitรฉ d'Aix-Marseille), Francesco Dighera (TU Munich)25/08/2015, 16:55Particle Cosmology Theory and ExperimentWe will discuss the relic density of TeV-scale wino-like neutralino dark matter in the pMSSM. We have recently developed a framework enabling us to calculate the Sommerfeld enhanced relic density in general pMSSM scenarios. We will present the results of a thorough investigation of certain regions of parameter space, focussing in particular on departures from the well known pure wino scenario:...Go to contribution page
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Mr Sungwoo Hong (University of Maryland, College Park)25/08/2015, 17:15Particle Cosmology Theory and ExperimentWe consider theories where dark matter is composed of a thermal relic of weak scale mass, whose couplings to the Standard Model (SM) are however too small to give rise to the observed abundance. Instead, the abundance is set by annihilation to light hidden sector states that carry no charges under the SM gauge interactions. In such a scenario the constraints from direct and indirect detection,...Go to contribution page
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Dr Thomas Rizzo (SLAC)25/08/2015, 17:35Particle Cosmology Theory and ExperimentWe attempt to build a model that describes the Fermi galactic gamma-ray excess (FGCE) within a UV-complete Supersymmetric framework; we find this to be highly non-trivial. At the very least a successful Supersymmetric explanation must have several important ingredients in order to fit the data and satisfy other theoretical and experimental constraints. Under the assumption that a single...Go to contribution page
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Jason Evans (University of Minnesota)25/08/2015, 17:55Particle Cosmology Theory and ExperimentMotivated by the coincidence between the Hubble scale during inflation and the typical see-saw neutrino mass scale, we present a supergravity model where the inflaton is identified with a linear combination of right-handed sneutrino fields. The model accommodates an inflaton potential that is flatter than quadratic chaotic inflation, resulting in a measurable but not yet ruled out...Go to contribution page
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Harikrishnan Ramani (Yang Institute Of Theoretical Physics)27/08/2015, 14:00Particle Cosmology Theory and ExperimentBaryogenesis at the electroweak scale requires the EW phase transition to be first order, and the discovery of the 125 GeV Higgs confirms that it is second order in the standard model. A myriad of extensions to the Higgs sector have been proposed to still allow for EW baryogenesis. Most approaches to testing the success of these BSM extensions employ a high temperature, small coupling...Go to contribution page
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Mrs Kimiko Yamashita (Ochanomizu University)27/08/2015, 14:20Particle Cosmology Theory and ExperimentWe propose a new baryogenesis scenario, which occurs during reheating after inflation. During reheating, the oscillation of the inflaton field breaks thermal equilibrium, providing one of the necessary conditions for baryogenesis. The inflaton field is assumed to couple to a complex scalar field which carries baryon number, whose self coupling breaks B, C and CP, providing the remaining two...Go to contribution page
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Chang Sub Shin (Rutgers University)27/08/2015, 14:40Particle Cosmology Theory and ExperimentWe discuss a new mechanism for baryogenesis, in which the baryon asymmetry is generated by the lightest particle in another sector, for example the supersymmetric particle (LSP), decaying to quarks via baryonic-number-violating interactions. As a specific example, we use a supersymmetric axion model with an axino LSP and baryonic R-parity violation. This scenario predicts large R-parity...Go to contribution page
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George Zahariade (UC Davis)27/08/2015, 15:00Particle Cosmology Theory and ExperimentWe present a manifestly local, diffeomorphism invariant and locally Poincare invariant formulation of vacuum energy sequestering. In this theory, quantum vacuum energy generated by matter loops is cancelled by auxiliary fields. The auxiliary fields decouple from gravity almost completely. Their only residual effect is an *a priori* arbitrary, finite contribution to the curvature of the...Go to contribution page
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Angelo Monteux (Rutgers University)27/08/2015, 15:20Particle Cosmology Theory and ExperimentI will discuss thermal production of (pseudo-)goldstinos, the Goldstone fermions emerging from (multiple-) SUSY breaking, when the reheating temperature is well below the superpartner masses. In such a case, the production during the early matter-dominated era is more important than after reheating. Depending on the SUSY breaking scale, goldstinos are produced by freeze-in or freeze-out...Go to contribution page
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Neil Barrie27/08/2015, 15:40Particle Cosmology Theory and ExperimentWe propose a simple mechanism for generating ordinary luminous and dark matter during cosmic inflation. This scenario involves an extension of the Standard Model through the introduction of a dark matter candidate/s and an anomalous U(1)_X gauge group. The general framework developed is found to be able to replicate both the observed matter-antimatter asymmetry and the dark-to-visible matter...Go to contribution page
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Dr Yuhsin Tsai (UC Davis)27/08/2015, 16:30Particle Cosmology Theory and ExperimentI will discuss the possibility of producing DM bound states at the LHC, emphasizing on two popular scenarios that contain large DM self-couplings: the higgsinos in the lambda-SUSY model, and the DM particles in the self-interacting DM (SIDM) framework. Instead of generating missing energy signatures, these dark bound states have annihilation decays into visible particles in the detector and...Go to contribution page
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Jonathan Kozaczuk (TRIUMF)27/08/2015, 16:50Particle Cosmology Theory and ExperimentMany extensions of the Standard Model, such as the NMSSM, can predict new, relatively light pseudoscalars with Higgs-like couplings to Standard Model fermions. In particular, simple models of this type in which the pseudoscalar also couples to dark matter can explain the GeV Galactic Center excess as observed by the Fermi Large Area Telescope. In this talk, I will discuss the prospects for...Go to contribution page
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Soumya Rao (University of Adelaide, Adelaide)27/08/2015, 17:10Particle Cosmology Theory and ExperimentWe explore the possibility of detecting WIMP(Weakly Interacting Massive Particle) Dark Matter(DM) interacting via photon through its electric or magnetic dipole moments occuring at one loop, in so called Beam Dump experiments. We focus on one such experiment in particular, E613 in Fermilab, which involves a 400 GeV proton beam incident on a Tungsten target producing DM particles in this...Go to contribution page
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Dr Jing Ren (University of Toronto)27/08/2015, 17:30Particle Cosmology Theory and ExperimentWith the LHC Higgs discovery, we are strongly motivated to study gravitational interactions of the Higgs boson. In this talk, we study the unique dimension-4 operator of the Higgs with Ricci curvature in the effective field theory. This dimensionless nonminimal coupling affects weak gauge boson scattering amplitudes and yields perturbative unitarity violation in high energy. The same operator...Go to contribution page
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YUN JIANG (UC Davis)27/08/2015, 17:50Particle Cosmology Theory and ExperimentWith protection by an extra Z2 symmetry, non-SM Higgs boson could be a possible DM candidate. As an example, we consider the singlet extension of the two-Higgs-doublet model. Intriguingly, the dark matter interaction with nucleons in the model could violate isospin symmetry and thus lead to a solution to alleviating the conflict between LUX and other direct detection experiments....Go to contribution page
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Tom Rudelius (Harvard University)28/08/2015, 14:00Particle Cosmology Theory and ExperimentSince the BICEP2 detection of B-mode polarization announced in March 2014, there has been a renewal of interest in models of large-field inflation. Axions have gained popularity in this regard, as they may provide a way to realize large-field inflation consistent with the principle of naturalness. However, recent work has revealed additional challenges facing axion inflation, which are...Go to contribution page
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Prof. Qaisar Shafi (University of Delaware)28/08/2015, 14:25Particle Cosmology Theory and ExperimentWe explore the implications of a new minimal supersymmetric hybrid inflation model in which the MSSM ยต term arises from a coupling of the Higgs doublets to the inflaton sector, with |ยต| required to be greater than the gravitino mass m_G. Successful inflation with the scalar spectral index ns = 0.96โ0.97, is followed by a relatively high reheat temperature, T_RH โณ 10^12 GeV, in the presence of...Go to contribution page
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Prof. Seongchan Park (SKKU and KIAS)28/08/2015, 14:45Particle Cosmology Theory and ExperimentThe only observed elementary scalar, the Higgs, is examined as a source of cosmological inflation. I would discuss how the collider data on Higgs would imply for the cosmology and how the latest cosmological data would affect the precision measurement of particle physics, especially in the top quark mass measurement and the Higgs quartic coupling measurement, based on Higgs inflation framework.Go to contribution page
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Marcos A Garcia Garcia (University of Minnesota)28/08/2015, 15:05Particle Cosmology Theory and ExperimentSince the building-blocks of supersymmetric models include chiral superfields containing pairs of effective scalar fields, a multifield approach is particularly appropriate for models of inflation based on supergravity. We discuss two-field effects in no-scale supergravity models motivated by string compactifications, and show how they can alter the model predictions for the scalar spectral...Go to contribution page
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McCullen Sandora (CP3-Origins)28/08/2015, 15:25Particle Cosmology Theory and ExperimentWe investigate how long wavelength inflationary fluctuations can cause the background field to deviate from classical dynamics. For generic potentials, we show that, in the Hartree approximation, the long wavelength dynamics can be encapsulated by a two-field model operating in an effective potential. The latter is given by a simple Gaussian integral transformation of the original inflationary...Go to contribution page
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Anthony DiFranzo (UC Irvine / Fermilab)28/08/2015, 16:30Particle Cosmology Theory and ExperimentWe discuss options and challenges associated with building viable models of Vector Dark Matter which interact with the Standard Model via the Higgs boson. Higgs portals are often treated with an effective operator, here we instead discuss possible UV complete models to replace the effective operator. The primary focus will be a model where the portal is generated radiatively. We further...Go to contribution page
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Rebecca Leane (University of Melbourne)28/08/2015, 16:50Particle Cosmology Theory and ExperimentEffective field theory (EFT) formulations of dark matter interactions are a convenient and popular way to quantify LHC bounds on dark matter. However, some EFT operators considered do not respect the weak gauge symmetries of the Standard Model. These operators break down at the electroweak scale, rather than the energy scale of new physics, and are invalid at LHC energies. We carefully...Go to contribution page
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Matthew Dolan (SLAC National Accelerator Laboratory)28/08/2015, 17:10Particle Cosmology Theory and ExperimentWe present the prospects for the searches for DM at the LHC, future $e^+e^-$ colliders and direct detection experiments, based on our pMSSM10 analysis as presented in arXiv:1504.03260. This talk is submitted on behalf of the MasterCode collaboration. It is not clear yet who will actually give the talk.Go to contribution page
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Bohdan Grzadkowski (University of Warsaw)28/08/2015, 17:30Particle Cosmology Theory and ExperimentI will discuss an extension of the Standard Model by an additional U(1) gauge group and a complex scalar Higgs portal. As the scalar is charged under this gauge factor this simple model supplies a vector dark matter candidate satisfying LUX bounds, the observed relic abundance and limits from direct dark matter searches. An additional Higgslike state, that may be heavier or lighter than...Go to contribution page
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sonia el hedri (JGU Mainz)28/08/2015, 17:50Particle Cosmology Theory and ExperimentWe present a general classification of minimal models where the Dark Matter coannihilates with another particle X. Besides this new particle, such coannihilation processes typically require the existence of a mediator, M. Assuming tree-level and renormalizable interactions, we construct all the possible combinations of Dark Matter, X and M that respect gauge and Lorentz invariance. Our...Go to contribution page