ACP Seminar (Astronomy - Cosmology - Particle Physics)

Speaker: Christoph Weniger (DESY)
Title: Decaying dark matter, anisotropies, lines, and the Fermi LAT gamma-ray data
Date (JST): Thu, Apr 22, 2010, 13:00 - 15:00
Place: Seminar Room A
Related File: 257.pdf
Abstract: Many theoretically well-motivated models predict the decay of dark matter with
lifetimes much longer than the age of the Universe. This can potentially lead
to peculiar features in the observed cosmic-ray fluxes, like a rise in the
positron fraction, a dipole-like anisotropy in the apparent extragalactic
gamma-ray background or sharp gamma-ray lines. In this talk, firstly I will
review the interpretation of the PAMELA positron excess in terms of decaying
dark matter, and I will discuss observational prospects for and constraints
from the recent gamma-ray observations by Fermi LAT. Secondly, I will discuss
gamma-ray lines in the context of a concrete model with decaying hidden SU(2)
vector dark matter.