Hubble Parameter in Bulk Viscous Cosmology
General Relativity and Quantum Cosmology
2009-12-02 v1
Abstract
We discuss influences of bulk viscosity on the Early Universe, which is modeled by Friedmann-Robertson-Walker metric and Einstein field equations. We assume that the matter filling the isotropic and homogeneous background is relativistic viscous characterized by ultra-relativistic equations of state deduced from recent lattice QCD simulations. We obtain a set of complicated differential equations, for which we suggest approximate solutions for Hubble parameter . We find that finite viscosity in Eckart and Israel-Stewart fluids would significantly modify our picture about the Early Universe.
Cite
@article{arxiv.0912.0115,
title = {Hubble Parameter in Bulk Viscous Cosmology},
author = {A. Tawfik and H. Mansour and M. Wahba},
journal= {arXiv preprint arXiv:0912.0115},
year = {2009}
}
Comments
4 pages, 2 eps figure, Talk given at 12th Marcel Grossmann Meeting on "General Relativity", Paris-France, 12-18 July 2009