f(G) modified gravity and the energy conditions

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 pre...

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Bibliographic Details
Published in:Journal of physics. Conference series 2011-09, Vol.314 (1), p.012056-4
Main Authors: García, Nadiezhda M, Lobo, Francisco S N, Mimoso, José P, Harko, Tiberiu
Format: Article
Language:English
Subjects:
Acceleration
Cosmology
Couplings
Dark energy
Gravitation
Gravitation theory
Invariants
M theory
Physics
Scalars
String theory
Viability
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Summary: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.
ISSN:1742-6596
1742-6588
1742-6596
DOI:10.1088/1742-6596/314/1/012056