Singularity avoidance in classical gravity from four-fermion interaction

Cosimo Bambi, Daniele Malafarina, Antonino Marcianò, Leonardo Modesto

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)


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 languageEnglish
Pages (from-to)27-30
Number of pages4
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Publication statusPublished - Jun 27 2014

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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