On the thermodynamics of inhomogeneous perfect fluid mixtures

Details On the thermodynamics of inhomogeneous perfect fluid mixtures On the thermodynamics of inhomogeneous perfect fluid mixtures

2003-12-10

arxiv.org/abs/gr-qc/0312058v1

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

6 pages

Scientific paper

It is shown that inhomogeneous Szekeres and Stephani universes exist corresponding to non-dissipative binary mixtures of perfect fluids in local thermal equilibrium. This result contradicts a recent statement by Z\'arate and Quevedo (2004 Class. Quantum Grav. {\bf 21} 197, {\it Preprint} gr-qc/0310087), which affirms that the only Szekeres and Stephani universes compatible with these fluids are the homogeneous Friedmann-Robertson-Walker models. Thus, contrarily to their conclusion, their thermodynamic scheme do not gives new indications of incompatibility between thermodynamics and relativity. Two of the points that have generated this error are commented.

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