Repulsive gravity induced by a conformally coupled scalar field implies a bouncing radiation-dominated universe
arXiv:1703.03060 · doi:10.1007/s10714-017-2219-6
Abstract
In the present work we revisit a model consisting of a scalar field with a quartic self-interaction potential non-minimally (conformally) coupled to gravity [1]. When the scalar field vacuum is in a broken symmetry state, an effective gravitational constant emerges which, in certain regimes, can lead to gravitational repulsive effects when only ordinary radiation is coupled to gravity. In this case, a bouncing universe is shown to be the only cosmological solution admissible by the field equations when the scalar field is in such a broken symmetry state.
10 pages, 1 figure
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