Singularity avoidance in classical gravity from four-fermion interaction

被引:27
作者
Bambi, Cosimo
Malafarina, Daniele
Marciano, Antonino [1 ]
Modesto, Leonardo
机构
[1] Fudan Univ, Ctr Field Theory & Particle Phys, Shanghai 200433, Peoples R China
关键词
COLLAPSE;
D O I
10.1016/j.physletb.2014.05.013
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
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
引用
收藏
页码:27 / 30
页数:4
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