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Inflation in pure gravity with only massless spin-2 fields (1602.08949v2)
Published 29 Feb 2016 in gr-qc and hep-th
Abstract: We show that without introducing additional fields or extra degrees of freedom, a specific higher derivative extension of Einstein's gravity that has only a massless spin-2 excitation in its perturbative spectrum, has an inflationary period, a quasi-de Sitter phase with enough number of e-foldings required to solve the horizon and related problems. The crucial ingredient in the construction is the curvature dependence of the effective Newton's constant.
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