Some Cosmological Consequences of Non Trivial PPN Parameters $β$ and $γ$

Details Some Cosmological Consequences of Non Trivial PPN Parameters $β$ and $γ$ Some Cosmological Consequences of Non Trivial PPN Parameters $β$ and $γ$

1995-05-31

arxiv.org/abs/hep-th/9506020v2

Phys.Lett. B373 (1996) 282-288

Physics

High Energy Physics

High Energy Physics - Theory

14 pages. Latex file. Results unchanged, more detailed discussion provided

Scientific paper

10.1016/0370-2693(96)00146-3

We study homogeneous isotropic universe in a graviton-dilaton theory obtained, in a previous paper, by a simple requirement that the theory be able to predict non trivial values for $\beta$ and/or $\gamma$ for a charge neutral point star, without any naked singularities. We find that in this universe the physical time can be continued indefinitely into the past or future, and that all the physical curvature invariants are always finite, showing the absence of big bang singularity. Adding a dilaton potential, we find again the same features. As a surprising bonus, there emerges naturally a Brans-Dicke function, which has precisely the kind of behaviour needed to make $\omega_{bd} ({\rm today}) > 500$ in hyperextended inflation.

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