UNDERSTANDING COSMOLOGICAL BULK VISCOSITY

Authors
ZIMDAHL W
Citation
W. Zimdahl, UNDERSTANDING COSMOLOGICAL BULK VISCOSITY, Monthly Notices of the Royal Astronomical Society, 280(4), 1996, pp. 1239-1243
Citations number
8
Categorie Soggetti
Astronomy & Astrophysics
Journal title
Monthly Notices of the Royal Astronomical Society → ACNP
ISSN journal
00358711
Volume
280
Issue
4
Year of publication
1996
Pages
1239 - 1243
Database
ISI
SICI code
0035-8711(1996)280:4<1239:UCBV>2.0.ZU;2-U
Abstract
A universe consisting of two interacting perfect fluids with the same LF-velocity is considered. A heuristic mean free time argument is used to show that the system as a whole cannot also be perfect, but necess arily implies a non-vanishing bulk viscosity. A new formula for the bu lk viscosity is derived and compared with corresponding results of rad iative hydrodynamics.