Dark matter in a bouncing universe

TL;DR

This paper proposes a novel dark matter production scenario in a bouncing universe, where dark matter is generated out of equilibrium during contraction and expansion, offering potential insights into the universe's bounce through dark matter relic abundance.

Contribution

It introduces a new model of dark matter production in bouncing cosmology, linking relic abundance to the universe's critical temperature, which is a novel approach.

Findings

Dark matter can be produced out of equilibrium in both phases of a bouncing universe.

The relic abundance of dark matter is related to the critical temperature of the bounce.

Dark matter properties can serve as probes of the bouncing universe scenario.

Abstract

We investigate a new scenario of dark matter production in a bouncing universe, in which dark matter was produced completely out of equilibrium in the contracting as well as expanding phase. We explore possibilities of using dark matter as a probe of the bouncing universe, focusing on the relationship between a critical temperature of the bouncing universe and the present relic abundance of dark matter.