Probing the dark matter density evolution law with large scale structures

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 ρc(z) ∝ (1 + z) 3+ϵ, and then constrain ϵ. 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 ϵ is consistent with zero within 1 σ c.l., but the current dataset cannot rule out with high confidence level interacting models of dark matter and dark energy.