Quantum Mechanics of Charged Black Holes

Abstract

We quantize the spherically symmetric sector of generic charged black holes. Thermal properties are encorporated by imposing periodicity in Euclidean time, with period equal to the inverse Hawking temperature of the black hole. This leads to an exact quantization of the area (A) and charge (Q) operators. For the Reissner-Nordström black hole, $A=4\pi G\hslash (2n+p+1)$ and $Q=me$, for integers $n,p,m$. Consistency requires the fine structure constant to be quantized: $e^2/\hslash =p/m^2$. Remarkably, vacuum fluctuations exclude extremal black holes from the spectrum, while near extremal black holes are highly quantum objects. We also prove that horizon area is an adiabatic invariant.

5 pages, Latex. Minor changes. To appear in Phys. Lett. B

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• Spectrum of Charged Black Holes - The Big Fix Mechanism Revisited
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