Another model for the regularized big bang
General Relativity and Quantum Cosmology
2020-08-14 v4 High Energy Physics - Theory
Abstract
We propose a gravitational model with a Brans-Dicke-type scalar field having, in the would-be action, a "wrong-sign" kinetic term and a quartic interaction term. In a cosmological context, we obtain, depending on the boundary conditions, either the Friedmann solution or a kink-bounce solution. The expanding-universe Friedmann solution has a big bang curvature singularity, whereas the kink-bounce solution has a nonsingular bouncing behavior of the cosmic scale factor. The bounce occurs precisely at the moment when the scalar field of the kink-type configuration goes through zero, making for a vanishing effective gravitational coupling.
Cite
@article{arxiv.2005.12157,
title = {Another model for the regularized big bang},
author = {F. R. Klinkhamer},
journal= {arXiv preprint arXiv:2005.12157},
year = {2020}
}
Comments
20 pages, v4: appendix C expanded