History of cosmic evolution with modified Gauss-Bonnet-dilatonic coupled term

Abstract

Gauss-Bonnet-dilatonic coupling in four dimension plays an important role to explain late time cosmic evolution. However, this term is an outcome of low energy string effective action and thus ought to be important in the early universe too. Unfortunately, phase-space formulation of such a theory does not exist in the literature due to branching. We therefore consider a modified theory of gravity, which contains a nonminimally coupled scalar-tensor sector in addition to higher order scalar curvature invariant term with Gauss-Bonnet-dilatonic coupling. Such an action unifies early inflation with late-time cosmic acceleration. Quantum version of the theory is also well-behaved.

arXiv comment13 pages, 5 figures, To appear in EPJC (2017)

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• Inflation and cosmological evolution with $F(R,G)$ gravity theory
• Probing symmetric teleparallel gravity in the early universe
• Vulnerability of f(Q) gravity theory and a possible resolution
• Perusing Buchbinder--Lyakhovich canonical formalism for Higher-Order Theories of Gravity
• Conflict between some higher-order curvature invariant terms