Journal article
Annihilating asymmetric dark matter
NF Bell, S Horiuchi, IM Shoemaker
Physical Review D Particles Fields Gravitation and Cosmology | Published : 2015
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 cosmic microwave background 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 τ leptons prefer anti-DM number densities 1%-4% that of DM while the b-quar..
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Grants
Awarded by Danish National Research Foundation
Funding Acknowledgements
We are very grateful to Kevork Abazajian, John Beacom, and Manoj Kaplinghat for useful comments. We would also like to thank Mikko Laine for sharing the data on g<INF>eff</INF>(T) from [63], Marco Regis for sharing the SKA projection limits from [68], and Tuomas Karavirta for very helpful computing advice. The CP<SUP>3</SUP>-Origins center is partially funded by the Danish National Research Foundation, Grant No. DNRF90.