Explaining the cosmological dark matter coincidence in asymmetric dark QCD

Abstract

To properly solve the coincidence problem (ωDM≃5ωVM) in a model of asymmetric dark matter, one cannot simply relate the number densities of visible and dark matter without also relating their particle masses. Following previous work, we consider a framework where the dark matter is a confined state of a dark QCD gauge group whose confinement scale is dynamically related to the QCD confinement scale by a mechanism utilizing infrared fixed points of the two gauge couplings. In this work we present a new, "zero-coupling infrared fixed point"approach, which allows a larger proportion of models in this framework to generically relate the masses of the visible and dark matter particles. Due to the..