Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
1997-07-02
Phys.Rev. D56 (1997) 2188-2191; Erratum-ibid. D59 (1999) 069901
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
10 pages, Revtex 3.0. To be published in Phys.Rev.D
Scientific paper
10.1103/PhysRevD.56.2188
Nonextreme black hole in a cavity can achieve the extreme state with a zero surface gravity at a finite temperature on a boundary, the proper distance between the boundary and the horizon being finite. The classical geometry in this state is found explicitly for four-dimensional spherically-symmetrical and 2+1 rotating holes. In the first case the limiting geometry depends only on one scale factor and the whole Euclidean manifold is described by the Bertotti-Robinson spacetime. The general structure of a metric in the limit under consideration is also found with quantum corrections taken into account. Its angular part represents two-sphere of a constant radius. In all cases the Lorentzian counterparts of the metrics are free from singularities.
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