Annihilating Asymmetric Dark Matter
Nicole F. Bell, Shunsaku Horiuchi, Ian M. Shoemaker

TL;DR
This paper investigates the relic abundance and annihilation processes of asymmetric dark matter, deriving constraints from cosmic microwave background and gamma-ray data, and analyzing gamma-ray emissions from the Galactic Center.
Contribution
It introduces a method to determine the annihilation cross section in asymmetric dark matter models considering primordial asymmetry effects.
Findings
Anti-DM number density is 1-4% of DM for tau lepton channels.
Anti-DM can be 50-100% of DM for b-quark channels.
Constraints are derived from CMB and Fermi-LAT gamma-ray observations.
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 leptons prefer anti-DM number densities 1-4 that of DM while the -quark channel prefers 50-100.
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