Viscous Bianchi type I universes in brane cosmology

Details Viscous Bianchi type I universes in brane cosmology Viscous Bianchi type I universes in brane cosmology

2002-12-18

arxiv.org/abs/gr-qc/0212075v1

Class.Quant.Grav.20:407-422,2003

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

13 pages, 5 figures, to appear in Class. Quantum Grav

Scientific paper

10.1088/0264-9381/20/3/302

We consider the dynamics of a viscous cosmological fluid in the generalized Randall-Sundrum model for an anisotropic, Bianchi type I brane. To describe the dissipative effects we use the Israel-Hiscock-Stewart full causal thermodynamic theory. By assuming that the matter on the brane obeys a linear barotropic equation of state, and the bulk viscous pressure has a power law dependence on the energy density, the general solution of the field equations can be obtained in an exact parametric form. The obtained solutions describe generally a non-inflationary brane world. In the large time limit the brane Universe isotropizes, ending in an isotropic and homogeneous state. The evolution of the temperature and of the comoving entropy of the Universe is also considered, and it is shown that due to the viscous dissipative processes a large amount of entropy is created in the early stages of evolution of the brane world.

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