‘Understanding’ cosmological bulk viscosity | Zendy

Winfried Zimdahl | Zendy

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‘Understanding’ cosmological bulk viscosity

Author(s) -

Winfried Zimdahl

Publication year - 1996

Publication title -

monthly notices of the royal astronomical society

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.058

H-Index - 383

eISSN - 1365-8711

pISSN - 0035-8711

DOI - 10.1093/mnras/280.4.1239

Subject(s) - physics , volume viscosity , viscosity , radiative transfer , theoretical physics , cosmology , universe , classical mechanics , perfect fluid , argument (complex analysis) , thermodynamics , astrophysics , quantum mechanics , biochemistry , chemistry

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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