Dr
Kalliopi Petraki
(University of Melbourne (AU))
07/07/2012, 09:00
Track 11. Particle Astrophysics and Cosmology
Parallel Sessions
The similarity of the visible and the dark matter relic abundances suggests related production mechanisms. This is possible if the dark matter density is -analogously to the visible matter- due to an asymmetry in a dark particle number which is conserved at low energies. In pangenesis, the visible and dark asymmetries are produced jointly via Affleck-Dine dynamics, and they compensate each...
Dr
Benedict von Harling
(University of Melbourne (AU))
07/07/2012, 09:15
Track 11. Particle Astrophysics and Cosmology
Parallel Sessions
In pangenesis, the baryon asymmetry of the universe and the dark
matter abundance are generated simultaneously via the Affleck-Dine
mechanism. This talk will discuss the Affleck-Dine dynamics, both for the case of gravity- and gauge-mediated supersymmetry breaking. Cosmological constraints on the scenario, in particular arising from the production of gravitinos and the formation of Q-balls,...
Prof.
Keith Dienes
(NSF & University of Arizona & University of Maryland (US))
07/07/2012, 09:30
Track 11. Particle Astrophysics and Cosmology
Parallel Sessions
In this talk, we introduce a new framework for dark-matter physics which we call "Dynamical Dark Matter". Rather than focus on one or more stable dark-matter particles, we instead consider a multi-component framework in which the dark matter of the universe comprises a vast ensemble of interacting fields with a variety of different masses, mixings, and abundances. Moreover, rather than...
Dr
Brooks Thomas
(University of Hawaii (US))
07/07/2012, 09:45
Track 11. Particle Astrophysics and Cosmology
Parallel Sessions
In this talk, we provide an explicit realization of the DDM framework in which the constituent fields of the dark-matter ensemble are the mixed KK excitations of an axion propagating in the bulk of large extra spacetime dimensions. Mixing between these KK excitations, induced by a brane mass term, leads to a suppression of the interactions between the light mass eigenstates in the KK tower and...
Dr
Russell Neilson
(University of Chicago (US))
07/07/2012, 10:00
Track 11. Particle Astrophysics and Cosmology
Parallel Sessions
Data will be reported from the operation of a 4.0 kg CF3I bubble chamber in the 6800 foot deep SNOLAB underground laboratory. The effectiveness of ultrasound analysis in discriminating alpha decay background events from single nuclear recoils has been confirmed. The total exposure was 553 kg-days distributed over three different bubble nucleation thresholds. This observation provides world...
Dr
Hau-Bin Li
(Academia Sinica (TW))
07/07/2012, 10:15
Track 11. Particle Astrophysics and Cosmology
Parallel Sessions
Germanium detectors with sub-keV sensitivities offer a unique opportunity to probe low-mass WIMP Dark Matter, where there is an intense interest inspired by possible allowed regions indicated by the CoGeNT experiment. The TEXONO-CDEX Collaboration has been pursuing such research program at the Kuo-Sheng Neutrino Laboratory (KSNL) in Taiwan and in the China Jinping Underground Laboratory (CJPL)...
Dr
Lauren Hsu
(Fermi National Accelerator Laboratory (US))
07/07/2012, 10:30
Track 11. Particle Astrophysics and Cosmology
Parallel Sessions
Direct searches for dark matter are one of the most promising ways to discover new particles and fields. For over a decade, the Cryogenic Dark Matter Search has been a leader in searches for dark matter. CDMS has pioneered the use of athermal phonon and ionization sensors to achieve world-leading sensitivity to a theoretically-favored dark matter candidate, the Weakly Interacting Massive...
Dr
Robert Foot
(University of Melbourne (AU))
07/07/2012, 11:00
Track 11. Particle Astrophysics and Cosmology
Parallel Sessions
The DAMA, CoGeNT and CRESST-II experiments have announced evidence for the direct detection of dark matter.
We discuss these results in the context of the mirror dark matter framework. We show that all three experiments can be simultaneously explained via kinetic mixing induced elastic scattering of a mirror metal component off target nuclei. This metal component can be as heavy as Fe$'$ if...
Prof.
Richard Hill
(University of Chicago (US))
07/07/2012, 11:15
Track 11. Particle Astrophysics and Cosmology
Parallel Sessions
We introduce heavy particle effective field theory techniques to isolate universal properties and to systematically study the QCD anatomy of dark matter direct detection.
In particular: Particles that are heavy compared to the electroweak scale ($M \gg m_W$), and that are charged under electroweak SU(2) gauge interactions display universal properties such as a characteristic fine structure...
Dr
Nazila Mahmoudi
(CERN (CH) & Clermont Ferrand University (FR))
07/07/2012, 11:30
Track 11. Particle Astrophysics and Cosmology
Parallel Sessions
Three dark matter direct detection experiments (DAMA, COGENT and CRESST) have reported a possible signal of WIMP interaction corresponding to very light particles, close to the edge of the XENON-100 and CDMS sensitivity. Imposing the latest constraints from colliders, flavour physics, electroweak precision tests and dark matter searches, we show that viable MSSM scenarios with a light...
Dr
Ho-Chin Tsai
(Chung Yuan Christian University (TW))
07/07/2012, 11:45
Track 11. Particle Astrophysics and Cosmology
Parallel Sessions
Dark matter (DM) search is one of the major goals in the modern physics. An eligible dark matter candidate may reproduce the correct relic inferred from astrophysical observations, e.g. WMAP experiment. It may also be compatible with the null results on dark matter direct detection performed in the underground laboratories by measuring events of nuclei recoil as scattered by the halo dark...
Mr
Galea Ahmad
(University of Melbourne (AU))
07/07/2012, 12:00
Track 11. Particle Astrophysics and Cosmology
Parallel Sessions
We investigate electroweak bremsstrahlung as a potential search channel for dark matter at the LHC. For illustrative purposes we consider a typical quarkphilic model with a Majorana dark matter candidate. We focus on the emission of a $Z$ boson from either the initial state particles or the internal propagator during annihilation of quarks into dark matter. Among the signatures of such...
Dr
Tracy Slatyer
(Institute for Advanced Study (US))
07/07/2012, 12:15
Track 11. Particle Astrophysics and Cosmology
Parallel Sessions
The annihilation or decay of dark matter (DM), or other new physics, could inject high-energy electrons and photons into the universe during the cosmic dark ages. The resulting modification to the cosmic ionization history induces a characteristic perturbation to the anisotropies of the cosmic microwave background (CMB) radiation. I will show how to describe an arbitrary energy injection...
Prof.
Csaba Balazs
(Monash University (AU))
07/07/2012, 12:30
Track 11. Particle Astrophysics and Cosmology
Parallel Sessions
The anomalous part of the cosmic electron-positron flux can be isolated within a Bayesian likelihood analysis. From the cosmic ray data the values of relevant cosmic ray propagation parameters can be also be inferred. I show how a tension arises between various cosmic ray datasets indicating an e+/e- anomaly. Then I show how to calculate the anomalous part of the PAMELA and Fermi-LAT...
Aldo Morselli
(INFN Roma Tor Vergata)
07/07/2012, 12:45
Track 11. Particle Astrophysics and Cosmology
Parallel Sessions
Can we learn about New Physics with astronomical and astro-particle data?
Since its launch in the 2008, the Large Area Telescope, onboard of the Fermi Gamma-ray Space Telescope, has detected the largest amount of gamma rays in the 20MeV 300GeV energy range and electrons + positrons in the 7 GeV- 1 TeV range. This impressive statistics allows one to perform a very sensitive indirect...
Prof.
Kameshwar Wali
(Syracuse University (US))
07/07/2012, 13:45
Track 12. Formal Theory Developments
Parallel Sessions
Present a theory of gravity with an extra-dimension and metric-dependent torsion. A set of constraints imposed on the geometry confine torsion components to the extra-dimension and determine all the connection coefficients in terms of the metric. At the kinematic level, the theory maps on to 4D General Relativity. keeping the extra-dimension hidden. But the dynamical field equations that...
Dr
Jose Bellido
(University of Adelaide (AU))
07/07/2012, 14:00
Track 11. Particle Astrophysics and Cosmology
Parallel Sessions
The Pierre Auger Observatory is a cosmic ray detector optimized for the detection of air showers (particle cascades in the atmosphere) created by particles with energies ranging from 10^17 eV to about 10^20 eV. The Pierre Auger Observatory is a hybrid detector. It uses a ground array of water Cherenkov tanks (deployed over an area of 3000 square kilometers), and a set of fluorescence...
Prof.
Roger Clay
(University of Adelaide (AU))
07/07/2012, 14:15
Track 11. Particle Astrophysics and Cosmology
Parallel Sessions
The observation of ultra-high energy netrinos (UHEฯ
s) is a priority in experimental astroparticle physics. This follows from the expectation that energetic cosmic ray particles are likely to be produced with an associated flux of neutrinos, and the belief that UHE cosmic ray interactions will produce neutrinos as the parent particles travel to us through various astrophysical radiation...
Dr
Hisao Tokuno
(Tokyo Institute of Technology (JP))
07/07/2012, 14:30
Track 11. Particle Astrophysics and Cosmology
Parallel Sessions
The Telescope Array (TA) experiment is the largest experiment in the northern hemisphere studying ultra high energy cosmic rays (UHECRs). The Telescope Array is a hybrid detector consists of a surface detector (SD) array and air fluorescence detectors (FDs). This hybrid detector is observing extensive air showers to measure the energy spectrum, anisotropy and composition of ultra high energy...
Dr
Paolo Camarri
(University of Roma Tor Vergata)
07/07/2012, 14:45
Track 11. Particle Astrophysics and Cosmology
Parallel Sessions
The ARGO-YBJ experiment is an unconventional air-shower array designed for studying astronomical gamma-ray sources at energy greater than few hundred GeV and cosmic-ray physics at energy greater than about 1 TeV. The detector fulfils the requirements to achieve such goals thanks to its high-altitude location, 4300 meters a.s.l. on the Tibet plateau, and to its structure: a full-coverage layer...
Prof.
Yoshitaka Ito
(Nagoya University (JP))
07/07/2012, 15:00
Track 11. Particle Astrophysics and Cosmology
Parallel Sessions
The LHCf experiment has performed dedicated measurement of neutral particles in the very forward of LHC p-p collisions. The results in inclusive single photon spectra at 7TeV and 900GeV p-p collisions, and the pi0 transverse spectra at 7TeV p-p are presented with comparison of various hadron interaction models used for UHECR shower simulations. Also prospects in the 2012 p-Pb runs at LHC and...
Dr
Paul Doll
(KIT (DE))
07/07/2012, 15:15
Track 11. Particle Astrophysics and Cosmology
Parallel Sessions
(KASCADE-Grande Collaboration).
Muons have never been used up to now to reconstruct the hadron longitudinal development
of Extensive-Air-Showers (EAS) induced by Cosmic Rays (CR) with sufficient accuracy, due to the difficulty of building large area ground-based muon telescopes. The Muon Tracking Detector (MTD) in the KASCADE-Grande experiment (128 mยฒ, Eยต>0.8 GeV) allows to study the angular...
Dr
Paul Doll
(KIT (DE))
07/07/2012, 15:30
Track 11. Particle Astrophysics and Cosmology
Parallel Sessions
(KASCADE-Grande Collaboration).
High energy gamma rays produce muons in the Earth's atmosphere that can be detected and reconstructed in relatively shallow underground muon detectors such as ICECUBE and MILAGRO. Although muons of such low energy are mostly produced by charged Cosmic Ray (CR) particles, gamma produced muons (via photo-pion production) can be identified provided the detector...
Prof.
Mark Trodden
(University of Pennsylvania (US))
07/07/2012, 16:00
Track 11. Particle Astrophysics and Cosmology
Parallel Sessions
I describe how to construct new scalar field theories in four dimensions with attractive properties such as nonrenormalization theorems and interesting nonlinear classical dynamics. These generalized galileons are related to extra dimensional gravity models, and have a tight relationship to massive gravity models. Their properties suggest applications in inflation, late-time cosmic...
Prof.
Stefan Antusch
(University of Basel (CH))
07/07/2012, 16:15
Track 11. Particle Astrophysics and Cosmology
Parallel Sessions
We discuss inflation models in supergravity, where the inflaton resides in the matter sector of the theory. These models, referred to as matter inflation, are based on a tribrid structure in the superpotential and allow for a Heisenberg symmetry or a shift symmetry for solving the eta-problem. Possible close connections to particle physics theories are discussed, such as sneutrino hybrid...
Dr
Carlo Gustavino
(INFN (IT))
07/07/2012, 16:30
Track 11. Particle Astrophysics and Cosmology
Parallel Sessions
LUNA (Laboratory for Underground Nuclear Astrophysics) is devoted to measure nuclear cross sections relevant in astroparticle physics. The LUNA measurements are performed at the "Laboratori Nazionali del Gran Sasso" (LNGS), with the unique accelerator in the world operating underground. Here, the background induced by cosmic rays is orders of magnitude lower than outside. As a consequence,...
Dr
Masaya Hasegawa
(KEK (JP))
07/07/2012, 16:45
Track 11. Particle Astrophysics and Cosmology
Parallel Sessions
QUIET is a ground-based CMB Polarization experiment, which aims to detect the degree-scale B-modes (curl components) induced by primordial gravitational waves. The existence of the primordial gravitational wave is a generic prediction of inflationary universe, therefore the detection of the B-modes is a "smoking-gun" signature of the inflation. The B-mode signal is expected to be orders of...
Dr
Masaya Hasegawa
(KEK (JP))
07/07/2012, 17:00
Track 11. Particle Astrophysics and Cosmology
Parallel Sessions
Cosmic inflation predicts that primordial gravitational waves were created during the inflationary era. Measurements of polarization of the Cosmic Microwave Background (CMB) radiation are known as the best probe to detect the primordial gravitational waves.
POLARBEAR is a telescope designed to detect the CMB B-mode with very sensitive polarimeters based on superconductive transition edge...
Dr
Eric Charles
(SLAC (US))
07/07/2012, 17:15
Track 11. Particle Astrophysics and Cosmology
Parallel Sessions
The Fermi Large Area Telescope (LAT) has been operating since June 2008 and observes the gamma-ray sky from 20 MeV to over 300 GeV. The first four years of the LAT era have seen numerous exciting scientific results, some expected and others unexpected. In this talk I will discuss the current state of our understanding of the gamma-ray sky. In particular, I will describe how the Fermi-LAT...
Prof.
Veronica Bindi
(University of Hawaii at Manoa (US))
07/07/2012, 17:30
Track 11. Particle Astrophysics and Cosmology
Parallel Sessions
The Alpha Magnetic Spectrometer AMS-02 has been installed in May 19th 2011 on the International Space Station where it will detect cosmic rays for the next decades. AMS-02 with its accurate measurements up to the TeV scale will contribute to our knowledge of the Universe providing the most sensitive search for the existence of primordial anti matter and indirect search for dark matter.
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