TY - JOUR
T1 - Singularity avoidance in classical gravity from four-fermion interaction
AU - Bambi, Cosimo
AU - Malafarina, Daniele
AU - Marcianò, Antonino
AU - Modesto, Leonardo
N1 - Funding Information:
This work was supported by the NSFC grant No. 11305038 , the Shanghai Municipal Education Commission grant for Innovative Programs No. 14ZZ001 , the Thousand Young Talents Program , and Fudan University .
PY - 2014/6/27
Y1 - 2014/6/27
N2 - 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 asymptotically 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.
AB - 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 asymptotically 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.
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U2 - 10.1016/j.physletb.2014.05.013
DO - 10.1016/j.physletb.2014.05.013
M3 - Article
AN - SCOPUS:84901067386
VL - 734
SP - 27
EP - 30
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
SN - 0370-2693
ER -