Gedanken experiments on nearly extremal black holes and the Third Law

Details Gedanken experiments on nearly extremal black holes and the Third Law Gedanken experiments on nearly extremal black holes and the Third Law

2010-06-18

arxiv.org/abs/1006.3655v3

Phys.Rev.D82:104015,2010

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

v2: minor edits, references added; v3: minor edits to match published version

Scientific paper

10.1103/PhysRevD.82.104015

A gedanken experiment in which a black hole is pushed to spin at its maximal rate by tossing into it a test body is considered. After demonstrating that this is kinematically possible for a test body made of reasonable matter, we focus on its implications for black hole thermodynamics and the apparent violation of the third law (unattainability of the extremal black hole). We argue that this is not an actual violation, due to subtleties in the absorption process of the test body by the black hole, which are not captured by the purely kinematic considerations.

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