Noether Currents of Charged Spherical Black Holes

Details Noether Currents of Charged Spherical Black Holes Noether Currents of Charged Spherical Black Holes

2000-04-17

arxiv.org/abs/gr-qc/0004051v1

Phys.Rev. D62 (2000) 064024

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

4 pages

Scientific paper

10.1103/PhysRevD.62.064024

We calculate the Noether currents and charges for Einstein-Maxwell theory using a version of the Wald approach. In spherical symmetry, the choice of time can be taken as the Kodama vector. For the static case, the resulting combined Einstein-Maxwell charge is just the mass of the black hole. Using either a classically defined entropy or the Iyer-Wald selection rules, the entropy is found to be just a quarter of the area of the trapping horizon. We propose identifying the combined Noether charge as an energy associated with the Kodama time. For the extremal black hole case, we discuss the problem of Wald's rescaling of the surface gravity to define the entropy.

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