Cosmological bulk viscosity, the Burnett regime, and the BGK equation

Details Cosmological bulk viscosity, the Burnett regime, and the BGK equation Cosmological bulk viscosity, the Burnett regime, and the BGK equation

2002-10-25

arxiv.org/abs/gr-qc/0210089v1

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

9 pages, submitted to CQG

Scientific paper

Einstein's field equations in FRW space-times are coupled to the BGK equation in order to derive the stress energy tensor including dissipative effects up to second order in the thermodynamical forces. The space-time is assumed to be matter-dominated, but in a low density regime for which a second order (Burnett) coefficient becomes relevant. Cosmological implications of the solutions, as well as the physical meaning of transport coefficients in an isotropic homogeneous universe are discussed.

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