Orateur
Dr
Tracy Slatyer
(Harvard University)
Description
Recently measured excesses in electron and positron cosmic rays have
motivated models of dark matter with a velocity-dependent Sommerfeld
enhancement to the annihilation rate. These models frequently feature
nearly-degenerate excited states for the dark matter; such
excited states may also furnish explanations for the DAMA/LIBRA annual
modulation and INTEGRAL 511 keV line. I will present an accurate
semi-analytic approximation for the Sommerfeld enhancement in models
with a single excited state, and discuss novel features of the
enhancement relative to the case with no excited states. I will also
show the range of annihilation cross sections that can be achieved in
the local dark matter halo, for models of this type, where the dark
matter is a thermal relic with the correct relic abundance and
constraints from the cosmic microwave background are respected.
Author
Dr
Tracy Slatyer
(Harvard University)
