"Understanding" cosmological bulk viscosity
Astrophysics
2015-06-24 v1 General Relativity and Quantum Cosmology
Abstract
A universe consisting of two interacting perfect fluids with the same 4-velocity is considered. A heuristic mean free time argument is used to show that the system as a whole cannot be perfect as well but neccessarily implies a nonvanishing bulk viscosity. A new formula for the latter is derived and compared with corresponding results of radiative hydrodynamics.
Cite
@article{arxiv.astro-ph/9602128,
title = {"Understanding" cosmological bulk viscosity},
author = {Winfried Zimdahl},
journal= {arXiv preprint arXiv:astro-ph/9602128},
year = {2015}
}
Comments
12 pages, Latex file, to appear in MNRAS