Shear-free and homology conditions for self-gravitating dissipative fluids

Details Shear-free and homology conditions for self-gravitating dissipative fluids Shear-free and homology conditions for self-gravitating dissipative fluids

2003-05-02

arxiv.org/abs/gr-qc/0305005v2

Mon.Not.Roy.Astron.Soc. 343 (2003) 1207

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

13 pages Latex. To apppear in Month.Not.Roy.Astr.Soc. Corrected typos

Scientific paper

10.1046/j.1365-8711.2003.06764.x

The shear free condition is studied for dissipative relativistic self-gravitating fluids in the quasi-static approximation. It is shown that, in the Newtonian limit, such condition implies the linear homology law for the velocity of a fluid element, only if homology conditions are further imposed on the temperature and the emission rate. It is also shown that the shear-free plus the homogeneous expansion rate conditions are equivalent (in the Newtonian limit) to the homology conditions. Deviations from homology and their prospective applications to some astrophysical scenarios are discussed, and a model is worked out.

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