The effect of thermal radiation on singularities in the dark universe

Abstract

Cosmological models with an inhomogeneous viscous dark fluid, coupled with dark matter in the Friedmann- Robertson-Walker (FRW) flat universe, are considered. The influence of thermal effects caused by Hawking radiation on the visible horizon is studied, in connection with the classified type I and type III singularities which are known to occur within a finite amount of time. Allowance of thermal effects implies that a transition to a type II singularity can take place, in a finite time. We take into account a bulk viscosity of the dark fluid, observing the equation of state in the case of radiation, and find that there is a qualitative change in the singular universe of type I: it may pass into a singularity of type III, or it may avoid the singularity at all.

8 pages, to appear in Int. J. Geom. Meth. Mod. Phys

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• Singular behavior of the dark universe under the effect of thermal radiation in curved spacetime
• Thermodynamics and energy condition analysis for Van-Der-Waals EOS without viscous cosmology
• Viscous coupled fluids in terms of a log-corrected equation of state
• On rips and cosmological singularities in a universe merging with baby universes
• Singularity softening and avoidance by the action of thermal radiation in a generalized entropic cosmology