# IDM2010

Jul 26 – 30, 2010
Montpellier 2 University
Europe/Paris timezone

## Constraints on decaying-dark-matter models from simulations of isolated halos

Jul 29, 2010, 11:45 AM
20m
Salle des Actes (Montpellier 2 University)

### Salle des Actes

#### Montpellier 2 University

Place Eugene Bataillon, 34095 Montpellier Cedex 5 FRANCE
Talk Dark Matter Candidates

### Speaker

Annika Peter (Caltech)

### Description

We explore a dark-matter model in which there are two dark-matter species nearly degenerate in mass, with $\epsilon = \delta M/M \ll 1$. The heavier particle undergoes two-body decay to the lighter dark-matter particle and a massless particle with a half-life $\tau$. Unlike previous work on decaying dark matter, we explore the regime $\tau > 100$ Myr and non-relativistic kick speeds $v_k / c = \epsilon$. Using a set of N-body simulations of isolated dark-matter halos, we show how halos change as a function of $\tau$ and $v_k$. We show which parts of the $\tau-v_k$ parameter space are already ruled out by comparing the simulations to observations of dwarf-galaxy- to cluster-mass dark matter halos.

### Primary author

Annika Peter (Caltech)

 Slides