Black holes in a compactified spacetime

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Abstract
We discuss the properties of a 4-dimensional Schwarzschild black hole in a spacetime where one of the spatial dimensions is compactified. As a result of the compactification the event horizon of the black hole is distorted. We use Weyl coordinates to obtain the solution describing such a distorted black hole. This solution is a special case of the Israel-Khan metric. We study the properties of the compactified Schwarzschild black hole, and develop an approximation which allows one to find the size, shape, surface gravity, and other characteristics of the distorted horizon with a very high accuracy in a simple analytical form. We also discuss the possible instabilities of a black hole in compactified space.

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