1304.2305 (F. R. Klinkhamer)
F. R. Klinkhamer
An exact solution of the vacuum Einstein field equations over a nonsimply connected manifold is presented, which is spherically symmetric and nonsingular. This solution can be considered to be a regularization of the singular Schwarzschild--Kruskal--Szekeres solution over R^4. A heuristic discussion is of given how spherically symmetric collapse of matter in R^4 may result in this nonsingular black hole solution, if quantum gravity effects allow for topology change near the singularity.
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http://arxiv.org/abs/1304.2305
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