Expanding the Area of Gravitational Entropy

Details Expanding the Area of Gravitational Entropy Expanding the Area of Gravitational Entropy

2002-11-12

arxiv.org/abs/gr-qc/0211047v1

Found.Phys. 33 (2003) 65-86

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

Latex, 19 pgs., To appear in "Bekenstein Issues" of Foundations of Physics

Scientific paper

I describe how gravitational entropy is intimately connected with the concept of gravitational heat, expressed as the difference between the total and free energies of a given gravitational system. From this perspective one can compute these thermodyanmic quantities in settings that go considerably beyond Bekenstein's original insight that the area of a black hole event horizon can be identified with thermodynamic entropy. The settings include the outsides of cosmological horizons and spacetimes with NUT charge. However the interpretation of gravitational entropy in these broader contexts remains to be understood.

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