Abstract
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.
| Original language | English |
|---|---|
| Pages (from-to) | 27-30 |
| Number of pages | 4 |
| Journal | Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics |
| Volume | 734 |
| DOIs | |
| Publication status | Published - Jun 27 2014 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Nuclear and High Energy Physics
Cite this
Singularity avoidance in classical gravity from four-fermion interaction. / Bambi, Cosimo; Malafarina, Daniele; Marcianò, Antonino; Modesto, Leonardo.
In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, Vol. 734, 27.06.2014, p. 27-30.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Singularity avoidance in classical gravity from four-fermion interaction
AU - Bambi, Cosimo
AU - Malafarina, Daniele
AU - Marcianò, Antonino
AU - Modesto, Leonardo
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.
UR - http://www.scopus.com/inward/record.url?scp=84901067386&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84901067386&partnerID=8YFLogxK
U2 - 10.1016/j.physletb.2014.05.013
DO - 10.1016/j.physletb.2014.05.013
M3 - Article
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 -