f(G) modified gravity and the energy conditions

Details f(G) modified gravity and the energy conditions f(G) modified gravity and the energy conditions

2010-12-04

arxiv.org/abs/1012.0953v1

J.Phys.Conf.Ser.314:012060,2011

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

4 pages. Prepared for the proceedings of the Spanish Relativity meeting (ERE2010), Granada, Spain, 6-10 Sep 2010

Scientific paper

10.1088/1742-6596/314/1/012056

Motivated by string/M-theory predictions that scalar field couplings with the Gauss-Bonnet invariant, G, are essential in the appearance of non-singular early time cosmologies, we discuss the viability of an interesting alternative gravitational theory, namely, modified Gauss-Bonnet gravity, and present the viability bounds arising from the energy conditions. In particular, we consider a specific realistic form of f(G) analyzed in the literature that accounts for the late-time cosmic acceleration and that has been found to cure the finite-time future singularities present in the dark energy models, and further examine the respective viability of the specific f(G) model imposed by the weak energy condition.

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