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IDM2008 - Identification of Dark Matter 2008
IDM2008 - Identification of Dark Matter 2008
18-22 August 2008 AlbaNova
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Gamma-ray searches for dark matter with VERITAS and AGIS (20'+5')
Ground-based gamma-ray instruments are beginning to provide important
constraints on cold dark matter scenarios. Here, I summarize the current
observational status of gamma-ray searches for dark matter, and describe
prospects for future experiments.  While the LHC may detect evidence of new
weakly interacting particles, gamma-ray measurements provide the only means 
directly connecting these particles to the dark matter by directly measuring
the density profile of galactic halos.  Moreover, gamma-ray measurements can 
used to identify the dark matter candidate by providing detailed spectral
measurements of the line and continuum emission which are imprinted with 
branching ratios for the different annihilation channels.  Unlike direct
detection experiments, the cross-section for detection of gamma-rays is
intimately related to the decoupling cross section for a thermal relic; at high
energies there are tight constraints on the predicted gamma-ray production
cross-sections. New ground and space-based instruments such as GLAST, 
and HESS currently have the sensitivity to detect dark matter from some of the
strongest sources such as the Galactic center or spiked halos around Galactic
intermediate mass black holes.  While Whipple, HESS and MAGIC have detected
steady VHE emission from the Galactic center, a strong astrophysical 
appears to be present, and definitive observations will most likely require new
strategies such as observations of nearby dwarf galaxies, or unidentified GLAST
sources that could point to structure in the local halo.  I describe the
current status of gamma-ray measurements of the Galactic center and the 
galaxies Draco, Ursa Minor and Wilman I as well as prospects for VERITAS, HESS
and MAGIC-II in the GLAST era.  I also present detailed calculations of the
sensitivity requirements for a future gamma-ray instrument (such as AGIS or
CTA) to detect dark matter from a conservative model for the halos of nearby
Dwarf galaxies.
Id: 500
Place: AlbaNova
Room: Oskar Klein auditorium
Starting date:
18-Aug-2008   11:45
Duration: 25'
Contribution type: Talk
Primary Authors: Prof. BUCKLEY, James (Washington University)
Presenters: Prof. BUCKLEY, James
Material: slide Slides
Included in session: Indirect searches - gammas
Included in track: Indirect searches - gammas

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