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Action and Entropy of Extreme and Non-Extreme Black Holes

The Hamiltonian actions for extreme and non-extreme black holes are compared and contrasted and a simple derivation of the lack of entropy of extreme black holes is given. In the non-extreme case the wave function of the black hole depends on horizon degrees of freedom which give rise to the entropy. Those additional degrees of freedom are absent in the extreme case.

preprint1994arXivOpen access
Claudio Teitelboim
gr-qchep-th
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Claudio Teitelboim

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