Exploring the cosmological dark matter coincidence using infrared fixed points

Abstract

The asymmetric dark matter (ADM) paradigm is motivated by the apparent coincidence between the cosmological mass densities of visible and dark matter, ωDM≃5ωVM. However, most ADM models only relate the number densities of visible and dark matter, and do not motivate the similarity in their particle masses. One exception is a framework introduced by Bai and Schwaller, where the dark matter is a confined state of a dark QCD-like gauge group, and the confinement scales of visible and dark QCD are related by a dynamical mechanism utilizing infrared fixed points of the two gauge couplings. We build upon this framework by properly implementing the dependence of the results on the initial condition..