Early Universe with modified scalar-tensor theory of gravity.
Scalar-tensor theory of gravity with non-minimal coupling is a fairly good candidate for dark energy, required to explain late-time cosmic evolution. Here we study the very early stage of evolution of the universe with a modified version of the theory, which includes scalar curvature squared term. One of the key aspects of the present study is the unique technique of finding the coupling parameter and the potential. The perturbed generalized scalar field equation, obtained from the perturbed action, is matched with the perturbed form of the background scalar field equation, to relate the coupling parameter and the potential. Choice of early de-Sitter inflationary solution finally fixes the two, once and forever. Inflationary parameters found using these forms fall well within the observational limit
Publisher URL: http://arxiv.org/abs/1801.04056
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