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Annihilating Asymmetric Dark Matter

Authors
  • Bell, Nicole F.
  • Horiuchi, Shunsaku
  • Shoemaker, Ian M.
Type
Published Article
Publication Date
Aug 21, 2014
Submission Date
Aug 21, 2014
Identifiers
DOI: 10.1103/PhysRevD.91.023505
Source
arXiv
License
Yellow
External links

Abstract

The relic abundance of particle and antiparticle dark matter (DM) need not be vastly different in thermal asymmetric dark matter (ADM) models. By considering the effect of a primordial asymmetry on the thermal Boltzmann evolution of coupled DM and anti-DM, we derive the requisite annihilation cross section. This is used in conjunction with CMB and Fermi-LAT gamma-ray data to impose a limit on the number density of anti-DM particles surviving thermal freeze-out. When the extended gamma-ray emission from the Galactic Center is reanalyzed in a thermal ADM framework, we find that annihilation into $\tau$ leptons prefer anti-DM number densities 1-4$\%$ that of DM while the $b$-quark channel prefers 50-100$\%$.

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