Relic abundance of dark matter with coannihilation in non-standard cosmological scenarios

TL;DR

This paper examines how non-standard cosmological models like quintessence with kination and brane world scenarios affect dark matter relic abundance, especially considering coannihilation effects, revealing that these models alter the relic density compared to standard cosmology.

Contribution

It introduces an analysis of dark matter relic density considering coannihilation within non-standard cosmological frameworks, highlighting differences from standard cosmology.

Findings

Enhanced Hubble rate increases relic density in non-standard models.

Coannihilation decreases relic density more slowly in non-standard scenarios.

Relic density in non-standard models differs significantly from standard cosmology.

Abstract

We investigate the relic abundance of dark matter from coannihilation in non-standard cosmological scenarios. We explore the effect of coannihilation on the relic density of dark matter and freeze out temperature in quintessence model with kination phase and brane world cosmological scenarios. Since the Hubble expansion rate is enhanced in quintessence and brane world cosmological models, it causes the larger relic density compared to that in the standard one. On the other hand, the relic density of dark matter is decreased due to the coannihilation in the standard cosmological scenario. After including coannihilation in quintessence or brane world cosmological scenarios, we find the decrease of the relic density of dark matter is slightly slower than that in the standard cosmological scenario.