Singularity-free cosmology: a simple model

Sathyaprakash, Bangalore Suryanarayana ORCID: https://orcid.org/0000-0003-3845-7586, Goswami, P. and Sinha, K. 1986. Singularity-free cosmology: a simple model. Physical Review D -Particles, Fields, Gravitation and Cosmology 33 (8) , pp. 2196-2200. 10.1103/PhysRevD.33.2196

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Abstract

The nonminimal coupling of a self-interacting complex scalar field with gravity is studied. For a Robertson-Walker open universe the stable solutions of the scalar-field equations are time dependent. As a result of this, a novel spontaneous symmetry breaking occurs which leads to a varying effective gravitational coupling coefficient. It is found that the coupling coefficient changes sign below a critical ‘‘radius’’ of the Universe implying the appearance of repulsive gravity. The occurrence of the repulsive interaction at an early epoch facilitates singularity avoidance. The model also provides a solution to the horizon problem.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Schools > Physics and Astronomy
Subjects:	Q Science > QB Astronomy
Publisher:	American Physical Society
ISSN:	0556-2821
Last Modified:	24 Oct 2022 10:52
URI:	https://orca.cardiff.ac.uk/id/eprint/46250

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