2014/02/28 by Edward Hardy, Robert Lasenby, James Unwin · 2 citations
Computer Science · Physics and Astronomy · #Computational Physics and Python Applications #Dark Matter and Cosmic Phenomena #Particle physics theoretical and experimental studies #astro-ph.HE #hep-ph
paper · pdf · doi:10.1007/jhep07(2014)049
published as JHEP 1407 (2014) 49 · 31 pages, 9 figures, v3; minor corrections, and reference added - matches version published in JHEP
openalex publication_date 2014/07/01 · arxiv created 2014/09/01 · arxiv updated 2014/09/02 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
In the simplest models of asymmetric dark matter (ADM) annihilation signals are not expected, since the DM is non-self-conjugate and the relic density of anti-DM is negligible. We investigate a new class of models in which a symmetric DM component, in the ‘low-mass’ 1-10 GeV regime favoured for linking the DM and baryon asymmetries, is repopulated through decays. We find that, in models without significant velocity dependence of the annihilation cross section, observational constraints generally force these decays to be (cosmologically) slow. These late decays can give rise to gamma-ray signal morphologies differing from usual annihilation profiles. A distinctive feature of such models is that signals may be absent from dwarf spheroidal galaxies.