Gravitational pressure on event horizons and thermodynamics in the teleparallel framework

Details Gravitational pressure on event horizons and thermodynamics in the teleparallel framework Gravitational pressure on event horizons and thermodynamics in the teleparallel framework

2012-02-22

arxiv.org/abs/1202.4995v1

Phys. Rev. D 85, 044050 (2012)

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

17 pages, 6 figures

Scientific paper

10.1103/PhysRevD.85.044050

The concept of gravitational pressure is naturally defined in the context of the teleparallel equivalent of general relativity. Together with the definition of gravitational energy, we investigate the thermodynamics of rotating black holes in the teleparallel framework. We obtain the value of the gravitational pressure over the external event horizon of the Kerr black hole, and write an expression for the thermodynamic relation $TdS =dE + pdV$, where the variations refer to the Penrose process for the Kerr black hole. We employ only the notions of gravitational energy and pressure that arise in teleparallel gravity, and do not make any consideration of the area or the variation of the area of the event horizon. However, our results are qualitatively similar to the standard expression of the literature.

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