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Singularity-free cosmology: a simple model

Sathyaprakash, Bangalore Suryanarayana, 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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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: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Publisher: American Physical Society
ISSN: 0556-2821
Last Modified: 04 Jun 2017 04:53

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