WIMP dark matter in bulk viscous non-standard cosmologies

Abstract

In this paper, we explored an extension of the classical non-standard cosmological scenario in which the new field, $\varphi$, which interacts with the radiation component in the early universe, experiences dissipative processes in the form of a bulk viscosity. Assuming an interaction term given by ${\Gamma }_{\varphi }{\rho }_{\varphi }$, where ${\Gamma }_{\varphi }$ accounts for the decay rate of the field and ${\rho }_{\varphi }$ corresponds to its energy density, and a bulk viscosity according to the expression $\xi ={\xi }_0{\rho }_{\varphi }^{1/2}$ in the framework of Eckart's theory, we apply this novel non-standard cosmology to study the parameters space for WIMPs Dark Matter candidate production. This parameter space shows deviations from the classical non-standard cosmological scenario, obtaining new regions to search for this candidate. In particular, for certain combinations of the free parameters, we found large regions in which the model can establish the DM and reproduce the current observable relic density.

15 pages and 19 figures. We added new references and comments in this new version

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Cited by in corpus (3)

• Unraveling particle dark matter with Physics-Informed Neural Networks
• FIMP Dark Matter in bulk viscous non-standard cosmologies
• Freeze-in and freeze-out production of Higgs portal Majorana fermionic dark matter during and after reheating