What prevents gravitational collapse in string theory?

DOI10.1142/S0218271816440181zbMATH Open1351.83060arXiv1609.05222OpenAlexW3105915664MaRDI QIDQ3179590

Author name not available (Why is that?)

Publication date: 19 December 2016

Published in: (Search for Journal in Brave)

Abstract: It is conventionally believed that if a ball of matter of mass $M$ has a radius close to $2GM$ then it must collapse to a black hole. But string theory microstates (fuzzballs) have no horizon or singularity, and they do {it not} collapse. We consider two simple examples from classical gravity to illustrate how this violation of our intuition happens. In each case the `matter' arises from an extra compact dimension, but the topology of this extra dimension is not trivial. The pressure and density of this matter diverge at various points, but this is only an artifact of dimensional reduction; thus we bypass results like Buchadahl's theorem. Such microstates give the entropy of black holes, so these topologically nontrivial constructions dominate the state space of quantum gravity.

Full work available at URL: https://arxiv.org/abs/1609.05222

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