Viscous coupled fluids in terms of a logcorrected equation of state
Abstract
We consider a class of cosmological fluids that possess properties analogous to those of crystalline solids undergoing isotropic deformations. Our research is based on a modified logcorrected powerlaw equation of state in the presence of a bulk viscosity. This formalism represents a class of socalled logotropic fluids, and allows explaining an accelerating latetime universe. In order to obtain a more detailed picture of its evolution, we add in our model a coupling of the logcorrected powerlaw fluid to dark matter, and study various interacting forms between them. We solve the system of equations for a modified logpowerlaw fluid coupled to dark matter, and obtain expressions for the logcorrected powerlaw energy density, and the energy density for dark matter. A comparative analysis is made with the model of a nonviscous logcorrected powerlaw fluid without interaction with dark matter.
 Publication:

arXiv eprints
 Pub Date:
 July 2021
 arXiv:
 arXiv:2107.10341
 Bibcode:
 2021arXiv210710341B
 Keywords:

 General Relativity and Quantum Cosmology
 EPrint:
 15 pages latex, author list corrected. To appear in Int. J. Geom. Meth. Mod. Phys