Annihilating Asymmetric Dark Matter

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$\%$.

7 pages, 5 figures

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Cited by in corpus (12)

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• WIMPs at the Galactic Center
• Towards a Supersymmetric Description of the Fermi Galactic Center Excess
• On the Direct Detection of Dark Matter Annihilation
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• CMB Constraints On The Thermal WIMP Mass And Annihilation Cross Section
• Confronting the Moduli-Induced LSP Problem
• Point Sources from Dissipative Dark Matter
• Tau Portal Dark Matter models at the LHC
• Minimal Asymmetric Dark Matter