"Understanding" cosmological bulk viscosity

Details "Understanding" cosmological bulk viscosity "Understanding" cosmological bulk viscosity

1996-02-23

arxiv.org/abs/astro-ph/9602128v1

Astronomy and Astrophysics

Astrophysics

12 pages, Latex file, to appear in MNRAS

Scientific paper

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.

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