A note on the gravitational dark matter production

TL;DR

This paper investigates how dark matter could be produced through gravitational mechanisms during the early universe's reheating phase, linking reheating temperature to dark matter mass and identifying viable mass ranges.

Contribution

It introduces a detailed analysis of gravitational dark matter production during reheating, connecting reheating temperature with dark matter mass, and constraining viable mass ranges.

Findings

Reheating temperature influences dark matter mass range.

Gravitational production mechanisms can account for dark matter.

Constraints on dark matter mass based on reheating bounds.

Abstract

Dark matter, one of the fundamental components of the universe, has remained mysterious in modern cosmology and particle physics, and hence, this field is of utmost importance at present moment. One of the foundational questions in this direction is the origin of dark matter which directly links with its creation. In the present article we study the gravitational production of dark matter in two distinct contexts: firstly, when reheating occurs through the gravitational particle production, and secondly, when it is driven by the inflaton's decay. We establish a connection between the reheating temperature and the mass of dark matter, and from the reheating bounds, we determine the range of viable dark matter mass values.