A general maximum entropy principle for self-gravitating perfect fluid

Details A general maximum entropy principle for self-gravitating perfect fluid A general maximum entropy principle for self-gravitating perfect fluid

2011-09-13

arxiv.org/abs/1109.2804v3

Phys.Rev.D 84, 104023 (2011); Phys. Rev. D 85, 027503 (2012)

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

13 pages, no figure. The arguments have been improved so that the assumption p=p(\rho) is no longer needed

Scientific paper

We consider a self-gravitating system consisting of perfect fluid with spherical symmetry. Using the general expression of entropy density, we extremize the total entropy $S$ under the constraint that the total number of particles is fixed. We show that extrema of $S$ coincides precisely with the relativistic Tolman-Oppenheimer-Volkoff (TOV) equation of hydrostatic equilibrium. Furthermore, we apply the maximum entropy principle to a charged perfect fluid and derive the generalized TOV equation. Our work provides a strong evidence for the fundamental relationship between general relativity and ordinary thermodynamics.

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