Singularity avoidance in classical gravity from four-fermion interaction
Open accessAbstract
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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The nonsingular bounce scenario solves the flatness and horizon problems in cosmology.
“In addition to eliminating the initial singularity, this scenario solves the flatness and horizon problems in cosmology (Popławski 2010c(Popławski , 2011a(Popławski , 2012a(Popławski , 2012b(Popławski , 2013b;;Magueijo et al. 2013;Alexander et al. 2014;Bambi et al. 2014).”
From UNIVERSE IN A BLACK HOLE IN EINSTEIN–CARTAN GRAVITY (2016) · cites this paper as Bambi et al. 2014
The Abstract describes a nonsingular bounce in a collapsing cloud, supporting that part of the attribution. The passages on apparent horizons concern trapped surfaces and black-hole formation, not the cosmological horizon problem; our copy does not show that the bounce solves either the flatness or cosmological horizon problem. (LLM, conf=0.86)
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UNIVERSE IN A BLACK HOLE IN EINSTEIN–CARTAN GRAVITY
Popławski, N. (2016) · The Astrophysical Journal · doi:10.3847/0004-637x/832/2/96 · Cited by 91 · see citing works
- Authors
- Bambi, C., Malafarina, D., Marcianò, A., & Modesto, L.
- Affiliations
- Fudan University (CN)
- Corresponding author
- Marcianò, Antonino
- Venue
- Physics Letters B
- Publisher
- Elsevier BV
- Published
- 2014-06
- Volume
- 734
- Pages
- 27-30
- ISSN
- 0370-2693 (ISSN-L)
- OpenAlex
- W2049412986
- Cited by
- 31
- References
- 0
- Citations by year
- 2026: 1 · 2025: 5 · 2024: 2 · 2021: 3 · 2020: 2 · 2019: 1 · 2018: 1 · 2017: 4 · 2016: 6 · 2015: 3 · 2014: 3
- FWCI
- 2.87
- Type
- journal article
- Language
- en
- Open access
- diamond
- doi.org
- Locations
- Physics Letters B (publishedVersion, cc-by)
- arXiv (Cornell University) (submittedVersion)
- Nazarbayev University Repository (Nazarbayev University) (submittedVersion)
- arXiv (Cornell University)
- Funders
- NSFC (11305038)
- Shanghai Municipal Education Commission (14ZZ001)
- Thousand Young Talents Program
- Fudan University
- Topics
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Cosmology and Gravitation Theories
- Physical Sciences › Physics and Astronomy › Nuclear and High Energy Physics › Black Holes and Theoretical Physics
- Physical Sciences › Physics and Astronomy › Statistical and Nonlinear Physics › Noncommutative and Quantum Gravity Theories
- Keywords
- singularity avoidance, gravitational collapse, four-fermion interaction, non-minimal coupling, Dirac fermions, bounce, event horizon, topological gravity, classical gravity
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