Determining Reheating Temperature at LHC with Axino or Gravitino Dark Matter

TL;DR

This paper explores how LHC measurements can help determine the reheating temperature of the universe by analyzing axino or gravitino dark matter within supersymmetric models, providing bounds on their masses.

Contribution

It demonstrates a method to infer the reheating temperature from collider data assuming dark matter is an axino or gravitino, linking cosmology and particle physics.

Findings

Reheating temperature can be constrained using LHC data.

Upper bounds on axino and gravitino masses are derived.

Reheating temperature bounds depend on dark matter particle assumptions.

Abstract

After a period of inflationary expansion, the Universe reheated and reached full thermal equilibrium at the reheating temperature. In this talk, based on the paper, arXiv:0710.3349, we point out that, in the context of effective low-energy supersymmetric models, LHC measurements may allow one to determine reheating temperature as a function of the mass of the dark matter particle assumed to be either an axino or a gravitino. An upper bound on their mass and on the reheating temperature may also be derived.