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 ${\rho }_c(z)\propto (1+z{)}^{3+\epsilon }$, 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.

arXiv comment7 pages, 4 figures, I table - Accepted in The European Physical Journal C

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