Abstract
I present two examples in which the curvature singularity of a radiation-dominated Universe is regularized by (a) the repulsive effects of spin interactions, and (b) the repulsive effects arising from a breaking of the local gravitational gauge symmetry. In both cases the collapse of an initial, asymptotically flat state is stopped, and the Universe bounces towards a state of decelerated expansion. The emerging picture is typical of the pre-big bang scenario, with the main difference that the string cosmology dilaton is replaced by a classical radiation fluid, and the solutions are not duality-invariant.
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Gasperini, M. Repulsive Gravity in the Very Early Universe. General Relativity and Gravitation 30, 1703–1709 (1998). https://doi.org/10.1023/A:1026606925857
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DOI: https://doi.org/10.1023/A:1026606925857