Relic Density of Asymmetric Dark Matter with Sommerfeld enhancement

TL;DR

This paper studies how Sommerfeld enhancement affects the relic density of asymmetric thermal dark matter, providing detailed numerical and analytical analysis and observational constraints.

Contribution

It offers a comprehensive analysis of Sommerfeld-enhanced annihilation effects on asymmetric dark matter relic abundance, including new analytical and numerical methods.

Findings

Sommerfeld enhancement significantly impacts dark matter relic density.

Constraints on coupling and asymmetry factor derived from observational data.

Both s-wave and p-wave enhancements are analyzed in detail.

Abstract

We investigate the evolution of the abundance of the asymmetric thermal Dark Matter when its annihilation rate at chemical decoupling is boosted by the Sommerfeld enhancement. We perform the detailed analysis of the effect of $s$-- and $p$--wave Sommerfeld enhanced annihilation cross section on the relic abundances of asymmetric Dark Matter particle and anti--particle both in numerical and analytical way. The constraints on the coupling and asymmetric factor are given by using the observational data of the relic density of Dark Matter.