Singularity-free cosmology: A simple model

B. S. Sathyaprakash, P. Goswami, K. P. Sinha

Research output: Contribution to journalArticlepeer-review

20 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)2196-2200
Number of pages5
JournalPhysical Review D
Issue number8
StatePublished - 1986

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)


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