Asymmetric WIMP Dark Matter in the presence of DM/anti-DM Oscillations

TL;DR

This paper investigates how particle/anti-particle oscillations affect asymmetric dark matter models, revealing that oscillations can reopen parameter space and allow for larger dark matter masses, constrained by indirect detection data.

Contribution

It introduces a calculation of dark matter relic abundance evolution considering oscillations, expanding the viable parameter space for asymmetric dark matter models.

Findings

Oscillations re-open parameter space for large WIMP-scale masses.

Constraints from indirect detection limit the model parameters.

Oscillations impact the relic abundance evolution significantly.

Abstract

The class of `Asymmetric Dark Matter' scenarios relies on the existence of a primordial particle/anti-particle asymmetry in the dark sector related to the baryon asymmetry as a way to address the observed similarity between the baryonic and dark matter energy densities today. Focusing on this framework we calculate the evolution of the dark matter relic abundance in the presence of particle/anti-particle oscillations. We show how oscillations re-open the parameter space of asymmetric dark matter models, in particular in the direction of allowing large (WIMP-scale) DM masses. Finally, we constrain the parameter space in this framework by applying up-to-date bounds from indirect detection signals on annihilating DM.