Inflation in pure gravity with only massless spin-2 fields
arXiv:1602.08949
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.
arXiv comment5 pages,1 figure, reference added, typos corrected
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