Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2011-09-13
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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