Probing the dark matter density evolution law with large scale structures

TL;DR

This paper introduces a new method to test deviations from the standard dark matter density evolution law using gravitational lensing and galaxy cluster data, finding no significant deviation but leaving room for interacting dark sector models.

Contribution

It proposes a novel approach to constrain potential deviations in dark matter density evolution using diverse astrophysical datasets.

Findings

The parameter epsilon is consistent with zero within 1 sigma.

Current data cannot exclude interacting dark matter-dark energy models.

The method combines lensing and X-ray data for evolution law testing.

Abstract

We propose a new method to explore a possible departure from the standard time evolution law for the dark matter density. We looked for a violation of this law by using a deformed evolution law, given by $\rho_c(z) \propto (1+z)^{3+\epsilon}$, and then constrain $\epsilon$. The dataset used for this purpose consists of Strong Gravitational Lensing data obtained from SLOAN Lens ACS, BOSS Emission-line Lens Survey, Strong Legacy Survey SL2S, and SLACS; along with galaxy cluster X-ray gas mass fraction measurements obtained using the Chandra Telescope. Our analyses show that $\epsilon$ is consistent with zero within 1 $\sigma$ c.l., but the current dataset cannot rule out with high confidence level interacting models of dark matter and dark energy.