Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2003-12-04
Some Topics on General Relativity and Gravitational Radiation. Proceedings of Spanish Relativity Meeting-96 (Paris: Ed. Fronti
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
7 pages, 4 figures; note added to reference [8]
Scientific paper
A criterion is presented and discussed to detect when a divergence-free perfect fluid energy tensor in the space-time describes an evolution in local thermal equilibrium. This criterion is applied to the class II Szafron-Szekeres perfect fluid space-times solutions, giving a very simple characterization of those that describe such thermal evolutions. For all of them, the significant thermodynamic variables are explicitly obtained. Also, the specific condition is given under which the divergence-free perfect fluid energy tensors may be interpreted as an ideal gas.
Coll Bartolomé
Ferrando Joan Josep
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