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Singularity avoidance in classical gravity from four-fermion interaction
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DOI：10.1016/j.physletb.2014.05.013.png)
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We derive the dynamics of the gravitational collapse of a homogeneous and spherically symmetric cloud in a classical set-up endowed with a topological sector of gravity and a non-minimal coupling to fermions. The effective theory consists of the Einstein-Hilbert action plus Dirac fermions interacting through a four-fermion vertex. At the classical level we obtain the same picture that has been recently studied by some of us within a wide range of effective theories inspired by a super-renormalizable and a symptotically free theory of gravity. The classical singularity is replaced by a bounce beyond which the cloud re-expands indefinitely. We thus show that even at a classical level if we allow for a non-minimal coupling of gravity to fermions event horizons may never form for a suitable choice of some parameters of the theory. (C) 2014 The Authors. Published by Elsevier B.V
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COLLAPSE
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IF:
4.5
论文数:
3.2W
被引数:
7.3W
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