Gravitational four-fermion interaction and dynamics of the early Universe
I.B. Khriplovich, A.S. Rudenko
TL;DR
This paper investigates the role of gravitational four-fermion interaction in early universe cosmology, deriving analytical solutions and showing it does not cause a Big Bounce.
Contribution
It provides an explicit analytical solution for FLRW cosmology including GFFI and clarifies that GFFI does not lead to a Big Bounce scenario.
Findings
GFFI influences early universe dynamics but does not induce a Big Bounce.
Analytical solutions incorporating GFFI are derived.
GFFI's effects are explicitly characterized in the cosmological model.
Abstract
If torsion exists, it generates gravitational four-fermion interaction (GFFI), essential on the Planck scale. We analyze the influence of this interaction on the Friedmann-Lemaitre-Robertson-Walker (FLRW) cosmology. Explicit analytical solution is derived for the problem where both the energy-momentum tensor generated by GFFI and the common ultrarelativistic energy-momentum tensor are included. We demonstrate that gravitational four-fermion interaction does not result in Big Bounce.
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