A test of the standard dark matter density evolution law using galaxy clusters and cosmic chronometers

TL;DR

This paper tests the standard dark matter density evolution law using galaxy clusters and cosmic chronometers, finding results consistent with the traditional model within 2 sigma confidence.

Contribution

It introduces a deformed dark matter density evolution law and constrains its deviation parameter using observational data.

Findings

Deformation parameter epsilon is consistent with zero within 2 sigma.

Results agree with previous analyses of dark matter evolution.

Supports the standard dark matter density evolution law.

Abstract

In this letter, we implement a test of the standard law for the dark matter density evolution. For this purpose, only a flat universe and the validity of the FRW metric are assumed. A deformed dark matter density evolution law is considered, given by $\rho_c(z) \propto (1+z)^{3+\epsilon}$, and constraints on $\epsilon$ are obtained by using galaxy cluster gas mass fractions, and cosmic chronometers measurements. We find that $\epsilon =0$ within 2$\sigma$ c.l., in full agreement with other recent analyses.