23/07/2015, 09:00
Astroparticle Physics, Cosmology, Gravitation
talk
Since the commissioning of the fifth, large telescope in December 2012, H.E.S.S. II is the only array of Imaging Atmospheric Cherenkov Telescopes operating telescope of different sizes. Recent years have seen a tremendous effort in the design, implementation and optimisation of analysis techniques as well as improvements to the entire data acquisition scheme to allow for a very fast response...
Andres Sandoval
(Instituto de Fisica, UNAM)
23/07/2015, 09:30
Astroparticle Physics, Cosmology, Gravitation
talk
The High Altitude Water Cherenkov (HAWC) Gamma-Ray Observatory was completed this year at a 4100-meter site on the flank of the Sierra Negra volcano in Mexico. HAWC is a water Cherenkov ground array with the capability to distinguish 100 GeV - 100 TeV gamma rays from the hadronic cosmic-ray background. HAWC is uniquely suited to study extremely high energy cosmic-ray sources, search for...
Martin Erdmann
(Rheinisch-Westfaelische Tech. Hoch. (DE))
23/07/2015, 09:45
Astroparticle Physics, Cosmology, Gravitation
talk
We present a new method of investigating the galactic magnetic field
using public data of ultra-high energy cosmic rays. In comparisons of
expected and measured arrival directions of the cosmic rays we evaluate
the directional characteristics and magnitude of the field. Our analysis
provides first experimental verification of the deflection of ultra-high
cosmic rays in the galactic...
Collaboration H1
(DESY)
23/07/2015, 10:00
Astroparticle Physics, Cosmology, Gravitation
talk
Measurements of normalised cross sections for the production of photons and neutrons at
very small angles with respect to the proton beam direction in deep-inelastic ep scattering at HERA are presented as a function of the Feynman variable $x_F$ and of the centre-of-mass energy of the virtual photon-proton system $W$. The data are taken with the H1 detector in the years 2006 and 2007 and...
Dr
Antonio Surdo
(INFN - Sezione di Lecce (IT))
23/07/2015, 10:15
Astroparticle Physics, Cosmology, Gravitation
talk
The CR spectrum has been studied by the ARGO-YBJ experiment in a wide energy range (TeV โ PeV). This study is particularly interesting since it allows a better understanding of the so called "knee" of the energy spectrum and its origin, and also provides a powerful cross-check among very different experimental techniques. The unique detector features (full coverage, time resolution, large...
Ruben Mauricio Da Silva Conceicao
(LIP Laboratorio de Instrumentacao e Fisica Experimental de Part)
23/07/2015, 10:30
Astroparticle Physics, Cosmology, Gravitation
talk
The interaction of Ultra High Energy Cosmic Rays with the atoms of the atmosphere can occur at center-of-mass energies that surpass the 100 TeV, while present man made accelerators go up to 13 TeV. Therefore it provides a unique opportunity to explore hadronic interactions at the highest energies. However, the extraction of hadronic interaction properties from the Extensive Air Showers (EAS)...
Javier Rico
(IFAE)
23/07/2015, 10:45
Astroparticle Physics, Cosmology, Gravitation
talk
Gamma-ray instruments like the Fermi-LAT (in space) and the MAGIC telescopes (on the ground) are sensitive to overlapping and complementary ranges of dark matter particle mass, and have dedicated programs to look for dark matter signals coming from the Galactic Center, galaxy clusters, dwarf satellite galaxies and others. The universality of dark matter properties allows the combination of...
Nicolas Arnaud
(LAL (CNRS-IN2P3))
23/07/2015, 11:30
Astroparticle Physics, Cosmology, Gravitation
talk
Since fall 2011 the Virgo collaboration has undertaken a major detector upgrade aiming to make the sensitivity of the Advanced Virgo gravitational-wave interferometer a factor 10 better than that of initial Virgo. 2015 should mark the completion of the Advanced Virgo construction and the restart of an intense commissioning activity. This talk will present the status and outlook of Advanced Virgo.
Tobias JENKE
(Atominstitut TU Wien)
23/07/2015, 12:00
Astroparticle Physics, Cosmology, Gravitation
talk
This talk focuses on two different kinds of gravity tests at short distances using ultracold neutrons within the qBounce experiments.
One class of gravity experiments focuses on the realization of a Quantum Bouncing Ball, i.e. a measurement of the time evolution of a neutron bouncing above a horizontal plane. In 2014, the spatial probability distribution of this Schrรถdinger wave packet has...
Dr
carlos yaguna
(MPIK, Heidelberg)
23/07/2015, 12:15
Astroparticle Physics, Cosmology, Gravitation
talk
We study the impact that future lepton flavor violating experiments will have on the viable parameter space of the scotogenic model. Within this model, the dark matter particle is assumed to be the lightest singlet fermion and two cases are considered depending on how its relic density is obtained: via self-annihilations or via coannihilations with the scalars. For each case, a scan over the...
Emanuele Angelo Bagnaschi
(DESY Hamburg)
23/07/2015, 12:30
Astroparticle Physics, Cosmology, Gravitation
talk
We present the prospects for searches for dark matter after Run 1 of the LHC, based on a global fit in the phenomenological MSSM with 10 parameters (pMSSM10). Particular care has been taken regarding the implementation of the most important limits obtained from the SUSY searches at Run 1 of the LHC. The information from the observed Higgs signal, limits from Higgs searches, as well as...
Julia Harz
(University College London)
23/07/2015, 14:30
Astroparticle Physics, Cosmology, Gravitation
talk
With the latest Planck results the dark matter relic density is determined to an unprecedented precision. In order to reduce current theoretical uncertainties in the dark matter relic density prediction, we have calculated next-to-leading order SUSY-QCD corrections to neutralino (co)annihilation processes including Coulomb enhancement effects. We demonstrate that these corrections can have...
Osamu Seto
(Hokkai-Gakuen University)
23/07/2015, 14:45
Astroparticle Physics, Cosmology, Gravitation
talk
Coherently generated PQ scalar fields could dominate the energy density in the early
Universe and decay into relativistic axions, which would confront with the current
dark radiation constraints. We study the condition that a thermal inflation driven
by a U(1) gauged Higgs field dilutes such axions, in particular, for the case of
gauged B-L symetry.
Sebastian Trojanowski
(National Centre for Nuclear Research, Poland)
23/07/2015, 15:00
Astroparticle Physics, Cosmology, Gravitation
talk
Possible discovery of supersymmetric particles in the second run of the LHC accompanied by lack of observation of a dark matter particle in direct searches may point towards dark matter candidates being extremely weakly interacting particles with supersymmetric origin. In this talk I will focus on two such candidates that are well motivated theoretically, namely the axino and the gravitino. In...
Michele Lucente
(LPT Orsay)
23/07/2015, 15:15
Astroparticle Physics, Cosmology, Gravitation
talk
We consider the possibility of simultaneously explaining Dark Matter and the Baryon Asymmetry of the Universe using different low-scale seesaw realisations involving sterile fermion states (such as right-handed neutrinos), among them minimal realisations of the Inverse seesaw and/or the Linear seesaw. In particular, we discuss the possibility of obtaining a successful leptogenesis in the...
Christian Spethmann
23/07/2015, 15:30
Astroparticle Physics, Cosmology, Gravitation
talk
While dark matter self-interactions may solve several problems with structure formation, so far only the effects of two-body scatterings of dark matter particles have been considered. We show that, if a subdominant component of dark matter is charged under an unbroken U(1) gauge group, collective dark plasma effects need to be taken into account to understand its dynamics. Plasma instabilities...
Maxim Eingorn
(urn:Facebook)
23/07/2015, 15:45
Astroparticle Physics, Cosmology, Gravitation
talk
The background evolution problem is resolved for the Universe endowed with relic colored objects โ quarks and gluons โ that survived hadronization either as isolated islands of quark-gluon โnuggetsโ (QNs), or as a uniform fluid. In the first scenario, QNs can play the role of dark matter. In the second scenario, uniform colored objects can play the role of dark energy providing the late-time...
Jelena Aleksic
(IFAE)
23/07/2015, 16:30
Astroparticle Physics, Cosmology, Gravitation
talk
The Dark Energy Survey (DES) is a next-generation large galaxy survey designed to study the origin of the accelerating Universe and the nature of dark energy. These goals are to be achieved through combination of four distinct probes: baryon acoustic oscillations, abundance and spatial distribution of clusters, weak gravitational lensing, and Type Ia supernovae. The main instrument of the...
Alain Blanchard
(IRAP)
23/07/2015, 16:45
Astroparticle Physics, Cosmology, Gravitation
talk
The acceleration of the expansion of the universe is now a well demonstrated feature of the universe which is almost impossible to bypassed. This leads to a very surprising question: why is gravity repulsive on large scales. By now, it is fair to say that we have no hint about the very reason for the origin of this phenomena (named hereafter dark energy) which can be regarded as one of the...
Dr
Surajit Chattopadhyay
(Pailan College of Management and Technology, Kolkata)
23/07/2015, 17:00
Astroparticle Physics, Cosmology, Gravitation
talk
Motivated by the work of Yang et al., *Mod. Phys. Lett. A*, **26**, 191 (2011), the present paper reports a study on reconstruction of scalar field dark energy models, namely, quintessence, DBI-essence and tachyon in the framework of chameleon Brans-Dicke cosmology. Firstly, we have reconstructed the Hubble parameter and consequently the density of the new holographic dark energy...
Kristjan Kannike
(Nat. Inst. of Chem.Phys. & Biophys. (EE))
23/07/2015, 17:15
Astroparticle Physics, Cosmology, Gravitation
talk
We present a minimal model of inflation where the Planck scale is dynamically generated from dimensionless interactions. The inflaton field $\phi$ gets a vacuum expectation value via dimensional transmutation. The Planck scale is generated via its non-minimal coupling to gravity $\xi\phi^2 R$. To generate the minimum of the inflaton potential, one needs a singlet scalar and new fermion(s)...
Dr
Roman Nevzorov
(University of Adelaide & ITEP)
23/07/2015, 17:30
Astroparticle Physics, Cosmology, Gravitation
talk
In $N=1$ supergravity (SUGRA) supersymmetric (SUSY) and non-supersymmetric
Minkowski vacua originating in the hidden sector can be degenerate. This allows for
consistent implementation of the multiple point principle (MPP) assumption.
We present no--scale inspired SUGRA model where the MPP assumption is realised
at the tree--level without extra fine-tuning. In the supersymmetric phase in...
Simone Biagi
(INFN)
24/07/2015, 09:00
Astroparticle Physics, Cosmology, Gravitation
talk
Neutrinos constitute an alternative to photons and cosmic rays to explore the high-energy sky, as they can emerge from dense media and travel across cosmological distances without being deflected by magnetic fields nor absorbed by ambient matter and radiation. The recent results by IceCube have given a great boost to the efforts towards the detection of high energy astrophysical neutrinos. If...
Vittorio Paolone
(University of Pittsburgh)
24/07/2015, 09:30
Astroparticle Physics, Cosmology, Gravitation
talk
DUNE - Deep Underground Neutrino Experiment - plans on using a 34-kton (fiducial mass) liquid argon time projection chamber to be sited at 4850 ft depth at the Sanford Underground Research Facility in South Dakota. The significant overburden at this site gives DUNE significant physics reach for several non-beam physics topics. These include neutrino oscillation studies with atmospheric...
Olga Suvorova
(Russian Academy of Sciences (RU))
24/07/2015, 09:50
Astroparticle Physics, Cosmology, Gravitation
talk
In April 2015 the deep underwater neutrino telescope Dubna was deployed
and started to take data in Lake Baikal. This array is a first cluster of
the cubic kilometer scale Gigaton Volume Detector (Baikal-GVD), which is
constructed in Lake Baikal. In this contribution we will review the design
and status of the neutrino telescope Dubna.
Dr
Tomasz Palczewski
(The University of Alabama)
24/07/2015, 10:05
Astroparticle Physics, Cosmology, Gravitation
talk
Neutrinos are expected to be produced in hadronic acceleration processes at the sources of extremely high-energy cosmic rays. These high-energy neutrinos should be produced in astrophysical sources like the Gamma Ray Bursts (GRBs), type I b/c supernovae, and Active Galactic Nuclei (AGNs). The expectation for the neutrino flavor ratio at the source is 1: 2: 0 (nu e : nu mu : nu tau). The flavor...
Markus Vehring
24/07/2015, 10:20
Astroparticle Physics, Cosmology, Gravitation
talk
With its low-energy extension DeepCore, the IceCube Neutrino Observatory, located at the geographic South Pole, measures neutrinos with energies above about 10 GeV. With this low energy threshold high statistics of about 150000 triggered atmospheric muon neutrinos are recorded per year. This enables the measurement of neutrino oscillations. The oscillation probability depends on the energy and...
Prof.
George W.S. Hou
(National Taiwan University)
24/07/2015, 10:35
Astroparticle Physics, Cosmology, Gravitation
talk
The recent IceCube astrophysical PeV neutrino events motivate the
planning of the Neutrino Telescope Array (NTA) observatory, which
will have three site stations watching the air mass surrounded by
Mauna Loa, Mauna Kea, and Hualalai on Hawaii Big Island, plus a
site station at the center watching the lower night sky.
By separating nu_tau -> tau conversion from tau-shower...
Francesca Calore
(University of Amsterdam)
24/07/2015, 11:30
Astroparticle Physics, Cosmology, Gravitation
talk
Unveiling the nature of dark matter is one of the biggest challenges of particle physics and cosmology. Beside direct detection and collider experiments, it is possible to look for a dark matter signal through indirect searches whose goal is to disentangle the signal from particle dark matter annihilation or decay from the large astrophysical background. I will discuss messengers and targets...
Regina Caputo
(University of California, Santa Cruz)
24/07/2015, 11:45
Astroparticle Physics, Cosmology, Gravitation
talk
The era of precision cosmology has revealed that ~80% of the total amount of matter in the universe is dark. Cosmic microwave background measurements, galactic rotation curves, and gravitational lensing each provide strong evidence for the existence of dark matter. One promising candidate, motivated by both Particle Physics and Astrophysics, is the Weakly Interacting Massive Particle (WIMP)....
Nikolas Zimmermann
(Rheinisch-Westfaelische Tech. Hoch. (DE))
24/07/2015, 12:00
Astroparticle Physics, Cosmology, Gravitation
talk
Precision measurements by the Alpha Magnetic Spectrometer on the
International Space Station of the primary cosmic-ray electron flux in
the range 0.5 to 700 GeV and the positron flux in the range 0.5 to 500
GeV are presented. The electron flux and the positron flux each require
a description beyond a single power-law spectrum. Both the electron flux
and the positron flux change their...
Mr
Yen-Hsun Lin
(Institute of Physics, National Chiao Tung University, Taiwan)
24/07/2015, 12:15
Astroparticle Physics, Cosmology, Gravitation
talk
We study the thermal transport occurring in the system of solar captured dark matter (DM) and explore its impact on the DM indirect search signal.
We particularly focus on the scenario of self-interacting DM (SIDM). The energy flows in and out of the system include the gravitational capture via DM-nucleon and DM-DM scatterings, the energy dissipation via DM annihilation, and the heat...
Sascha Caron
(Nikhef National institute for subatomic physics (NL))
24/07/2015, 12:30
Astroparticle Physics, Cosmology, Gravitation
talk
Observations with the Fermi Large Area Telescope (LAT) indicate an excess in gamma rays originating from the center of our Galaxy. A possible explanation for this excess is the annihilation of Dark Matter particles. We have investigated the annihilation of neutralinos as Dark Matter candidates within the phenomenological Minimal Supersymmetric Standard Model (pMSSM). An iterative particle...
Enrico Maria Sessolo
(NCBJ, Warsaw)
24/07/2015, 12:45
Astroparticle Physics, Cosmology, Gravitation
talk
We present prospects for detection of WIMP dark matter at the Cherenkov Telescope Array (CTA). We derive a realistic assessment of the sensitivity of CTA to photon fluxes from dark matter annihilation by means of a binned likelihood analysis for the Einasto and Navarro-Frenk-White halo profiles. We use the most up to date instrument response functions and background simulation model provided...
Florian Reindl
(Max-Planck-Insitute for Physics Munich)
24/07/2015, 14:30
Astroparticle Physics, Cosmology, Gravitation
talk
While the presence of dark matter in the universe was verified by observations on various astronomical scales, the nature of dark matter still remains a puzzling question. The most favored solution is the existence of Weakly Interacting Massive Particles (WIMPs). Experiments around the globe search for WIMPs; one of them is CRESST aiming to directly detect WIMPs scattering off nuclei in...
antoine cazes
(Universitรฉ Claude Bernard Lyon I)
24/07/2015, 15:00
Astroparticle Physics, Cosmology, Gravitation
talk
The EDELWEISS experiment is dedicated to the direct detection of Dark Matter. The current setup โ EDELWEISS-III โ aims at exploring a spin-independent WIMP-nucleon cross section down to the $10^{-9}$pb range, and extend the coverage for masses below 20 GeV. Since July 2014, the collaboration is taking data with 24 state-of-the-art cryogenic FID800 Germanium detectors installed in the radio...
Alexander Kish
(Physik-Institut UZH)
24/07/2015, 15:15
Astroparticle Physics, Cosmology, Gravitation
talk
Detectors based on noble gases are a very efficient and promising technology which leads the active field of dark matter searches.
The XENON collaboration aims at a direct detection of dark matter with experiments based on liquid xenon. The XENON100 detector, which is being operated at the Gran Sasso Underground Laboratory in Italy, is a dual-phase time-projection chamber with a 62 kg target...
Josef Pradler
(Austrian Academy of Sciences (AT))
24/07/2015, 15:30
Astroparticle Physics, Cosmology, Gravitation
talk
Dark matter detectors built primarily to probe elastic scattering of WIMPs on nuclei are also precise probes of light, weakly coupled particles that may be absorbed by the detector material. Ensuing constraints on the minimal model of dark matter comprised of long-lived vector states V (dark photons) in the 0.01-100 keV mass range are presented. The absence of an ionization signal in direct...
Monika Blanke
(CERN)
24/07/2015, 15:45
Astroparticle Physics, Cosmology, Gravitation
talk
Flavour symmetries in the dark sector are a theoretically motivated and phenomenologically appealing possibility. The dark matter particle can be stabilised with the help of flavour symmetries, without the need to introduce an additional discrete symmetry by hand. Apart from the usual searches in direct and indirect detection experiments and high energy colliders, flavoured dark matter...
Chun-Khiang Chua,
Gwo-Guang Wong
(Chung Yuan Christian University)
24/07/2015, 16:30
Astroparticle Physics, Cosmology, Gravitation
talk
We construct a generic model of Majorana fermion dark matter (DM). Starting with two Weyl spinor multiplets $\eta_{1,2}$ having quantum numbers $(I,\mp Y)$ coupled to the standard model (SM) Higgs, six additional Weyl spinor multiplets with $(I\pm 1/2, \pm(Y\pm 1/2))$ are needed in general. It has 13 parameters in total, five mass parameters and eight Yukawa couplings.
The DM sector of the...
Giorgio Arcadi
24/07/2015, 16:45
Astroparticle Physics, Cosmology, Gravitation
talk
We will analyze simple extensions of the Standard Model featuring a (fermionic) stable DM candidate and a mediator, a Z' or a scalar/pseudoscalar state, of its interactions with SM states. These kind of models result particulary manageable, because of the limited number of free-parameters, and offer a broad LHC phenomenology, ranging from mono-object sources to resonances in dileptons/dijets...
Juan Herrero Garcia
(KTH)
24/07/2015, 17:00
Astroparticle Physics, Cosmology, Gravitation
talk
I will discuss halo-independent tests of direct detection signals that we have derived in two recent works. In the first part [based on 1502.03342], I will discuss a halo-independent lower bound on the DM capture rate in the Sun from a direct detection signal, with which one can set limits on the branching ratios into different channels from the absence of a high-energy neutrino flux in...
Alfredo Davide Ferella
(Stockholm University)
24/07/2015, 17:15
Astroparticle Physics, Cosmology, Gravitation
talk
XENON1T has a design sensitivity for spin-independent WIMP-nucleon cross section a factor 100 below the XENON100 best limit, reachable by early 2018. Another order of magnitude can be achieved in a very cost effective and rapid realization building and installing in the same XENON1T vacuum cryostat a new detector with more than twice the liquid xenon mass and with even lower background:...
