Sathyaprakash, B. S. ; Goswami, P. ; Sinha, K. P. (1986) Singularity-free cosmology: a simple model Physical Review D - Particles, Fields, Gravitation and Cosmology, 33 (8). pp. 2196-2200. ISSN 1550-7998
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Official URL: http://prd.aps.org/abstract/PRD/v33/i8/p2196_1
Related URL: http://dx.doi.org/10.1103/PhysRevD.33.2196
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 |
|---|---|
| Source: | Copyright of this article belongs to The American Physical Society. |
| ID Code: | 48078 |
| Deposited On: | 14 Jul 2011 10:23 |
| Last Modified: | 14 Jul 2011 10:23 |
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