Fate of Three-Dimensional Black Holes Coupled to a Scalar Field and the Bekenstein-Hawking Entropy
Abstract
Three-dimensional black holes coupled to a self-interacting scalar field is considered. It is known that its statistical entropy a' la Strominger does not agree with the Bekenstein-Hawking (BH) entropy. However I show that, by a careful treatment of the vacuum state in the canonical ensemble with a fixed temperature, which is the same as that of the BTZ black hole without the scalar field, the BH entropy is exactly produced by the Cardy's formula. I discuss its several implications, including the fate of black holes, no-scalar-hair theorems, stability, mirror black holes, and one-loop corrections.
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