On the quartic curvature gravity in the context of FRW cosmology

Details On the quartic curvature gravity in the context of FRW cosmology On the quartic curvature gravity in the context of FRW cosmology

2008-03-18

arxiv.org/abs/0803.2577v1

Int.J.Mod.Phys.A23:2153-2160,2008

Physics

High Energy Physics

High Energy Physics - Theory

8 pages, LaTeX, contribution to the Proceedings of Osaka Workshop `Progress of String Theory and Quantum Field Theory', Decemb

Scientific paper

10.1142/S0217751X0804069X

We consider the purely gravitational fourth-order (in the spacetime curvature) quantum corrections to the Einstein-Hilbert gravity action, coming from superstrings in the leading order with respect to the Regge slope parameter, and study their impact on the evolution of the Hubble scale in the context of the FRW cosmology, in four spacetime dimensions. We propose the generalized Friedmann equations, and rule out the most naive (Bel-Robinson tensor squared) gravity. Our new cosmological equations have exact inflationary solutions without a spacetime singularity.

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