Probing the dark matter density evolution law with large scale structures
Kamal Bora (Department of Physics, Indian Institute of Technology, Hyderabad, Kandi, Telangana, 502285, India); R. Holanda (Departamento de Física, Universidade Federal do Rio Grande do Norte, Natal, Rio Grande do Norte, 59072-970, Brazil, Departamento de Física, Universidade Federal de Campina Grande, Campina Grande, PB, 58429-900, Brazil, Departamento de Física, Universidade Federal de Sergipe, Aracaju, SE, 49100-000, Brazil); Shantanu Desai (Department of Physics, Indian Institute of Technology, Hyderabad, Kandi, Telangana, 502285, India)
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.
