Testing the dark matter density evolution law with the large-scale structure
Cosmology, Standard Model, Dark matter density evolution law, Interacting models
The main purpose of this work is to propose an observational test for the dark matter density evolution law. We allow a deviation from the standard law such as
ρ_{DM}∝ (1+z)^{3+ε}, where ε = 0 recovers the canonical result. As observational sources, 40 measurements of the gas mass fraction of galaxy clusters on the
interval 0.078 ≤ z ≤ 1.063 and 18 points of measurements of Baryon Acoustic Oscillations on the interval 0.11 ≤ z ≤ 2.4 were used.
The Baryon Acoustic Oscillations data were used to infer the angular diameter distance to the galaxy clusters. From the statistical analyses,
we obtained ε =0 within 2σ c.l., in full agreement with recent results that used other observational quantities. Our results are independent of a
specific model of interaction in the dark sector.