DM particles: how warm they can be?

Abstract

One of important questions concerning particles which compose the Dark Matter (DM) is their average speed. We consider the model of relativistic weakly interacting massive particles and try to impose an upper bound on their actual and past warmness through the analysis of density perturbations and comparison with the LSS data. It is assumed that the DM can be described by the recently invented model of reduced relativistic gas (RRG). The equation of state of the RRG model is closely reproducing the one of the Maxwell distribution, while being much simpler. This advantage of the RRG model makes our analysis very efficient. As a result we arrive at the rigid and model-independent bound for the DM warmness without using the standard (much more sophisticated) approach based on the Einstein-Boltzmann system of equations.

17 pages, 12 figures, improved version accepted for publication in JCAP. Many discussions and clarifications, some figures and analysis added

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Cited by in corpus (9)

• Constraints on self-interacting Bose-Einstein condensate dark matter using large-scale observables
• Testing dark matter warmness and quantity via the reduced relativistic gas model
• On general features of warm dark matter with reduced relativistic gas
• Testing Dark Matter Clustering with Redshift Space Distortions
• Constraints from observational data for a running cosmological constant and warm dark matter with curvature
• Cosmic anisotropy with Reduced Relativistic Gas
• Too hot to handle? Analytic solutions for massive neutrino or warm dark matter cosmologies
• Theoretical foundations of the reduced relativistic gas in the cosmological perturbed context
• Analytical warm dark matter power spectrum on small scales