Singularity-free cosmology: A simple model

Sathyaprakash, BS and Goswami, P and Sinha, KP (1986) Singularity-free cosmology: A simple model. In: Physical Review D – Particles and Fields, 33 (8). pp. 2196-2200.

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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:	Journal Article
Publication:	Physical Review D – Particles and Fields
Publisher:	The American Physical Society
Additional Information:	Copyright of this article belongs to The American Physical Society.
Department/Centre:	Division of Physical & Mathematical Sciences Division of Physical & Mathematical Sciences > Astronomy and Astrophysics Programme Division of Physical & Mathematical Sciences > Physics
Date Deposited:	01 Feb 2010 07:41
Last Modified:	19 Sep 2010 05:40
URI:	http://eprints.iisc.ac.in/id/eprint/22176

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