Physics
Scientific paper
Apr 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986phrvd..33.2196s&link_type=abstract
Physical Review D (Particles and Fields), Volume 33, Issue 8, 15 April 1986, pp.2196-2200
Physics
16
Origin And Formation Of The Universe
Scientific paper
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.
Goswami Pallab
Sathyaprakash Bangalore S.
Sinha K. P.
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