Local thermal equilibrium and ideal gas Stephani universes

Details Local thermal equilibrium and ideal gas Stephani universes Local thermal equilibrium and ideal gas Stephani universes

2004-06-30

arxiv.org/abs/gr-qc/0406122v1

Gen.Rel.Grav. 37 (2005) 557-573

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

20 pages

Scientific paper

10.1007/s10714-005-0042-y

The Stephani universes that can be interpreted as an ideal gas evolving in local thermal equilibrium are determined. Five classes of thermodynamic schemes are admissible, which give rise to five classes of regular models and three classes of singular models. No Stephani universes exist representing an exact solution to a classical ideal gas (one for which the internal energy is proportional to the temperature). But some Stephani universes may approximate a classical ideal gas at first order in the temperature: all of them are obtained. Finally, some features about the physical behavior of the models are pointed out.

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