Testing dark matter warmness and quantity via the reduced relativistic gas model

Abstract

We use the framework of a recently proposed model of reduced relativistic gas (RRG) to obtain the bounds for $\Omega$'s of Dark Matter and Dark Energy (in the present case, a cosmological constant), taking into consideration an arbitrary warmness of Dark Matter. An equivalent equation of state has been used by Sakharov to predict the oscillations in the matter power spectrum. Two kind of tests are accounted for in what follows, namely the ones coming from the dynamics of the conformal factor of the homogeneous and isotropic metric and also the ones based on linear cosmic perturbations. The RRG model demonstrated its high effectiveness, permitting to explore a large volume in the space of mentioned parameters in a rather economic way. Taking together the results of such tests as Supernova type Ia (Union2 sample), $H(z)$, CMB ($R$ factor), BAO and LSS (2dfGRS data), we confirm that $\La$CDM is the most favored model. At the same time, for the 2dfGRS data alone we found that an alternative model with a very small quantity of a Dark Matter is also viable. This output is potentially relevant in view of the fact that the LSS is the only test which can not be affected by the possible quantum contributions to the low-energy gravitational action.

16 pages accepted for publication in PRD

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Cited by in corpus (14)

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• Vacuum stress-tensor in SSB theories
• Constraints from observational data for a running cosmological constant and warm dark matter with curvature
• Cosmic anisotropy with Reduced Relativistic Gas
• Cosmological analytic solutions with reduced relativistic gas
• Too hot to handle? Analytic solutions for massive neutrino or warm dark matter cosmologies
• Quantum corrections to gravity and their implications for cosmology and astrophysics
• Primordial universe with the running cosmological constant
• Interacting photon-baryon fluid, warm dark matter and the first acoustic peak
• Stochastic quantization of a self-interacting nonminimal scalar field in semiclassical gravity
• Analytical warm dark matter power spectrum on small scales
• Scalar field theory for warm dark matter