Constraints On Decaying Dark Matter Models From Simulations Of Isolated Halos

Details Constraints On Decaying Dark Matter Models From Simulations Of Isolated Halos Constraints On Decaying Dark Matter Models From Simulations Of Isolated Halos

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21537501p&link_type=abstract

American Astronomical Society, AAS Meeting #215, #375.01; Bulletin of the American Astronomical Society, Vol. 42, p.583

Astronomy and Astrophysics

Astronomy

Scientific paper

We explore a dark matter model in which there are two dark matter species nearly degenerate in mass, with ɛ = δM/M << 1. The heavier particle undergoes two-body decay to the lighter dark matter particle and a massless particle with a half-life κ. Unlike previous work on decaying dark matter, we explore the regime τ > 100 Myr and non-relativistic kick speeds vk / c = ɛ. Using a set of N-body simulations of isolated dark matter halos, we show how halos change as a function of τ and vk. We show which parts of the κ-vk parameter space are already ruled out by comparing the simulations to observations of dwarf galaxy to cluster mass dark matter halos.
We acknowledge the support of the Gordon and Betty Moore Foundation and Caltech's Summer Undergraduate Research Fellowship (SURF) program.

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