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We show that without introducing additional fields or extra degrees offreedom, a specific higher derivative extension of Einstein's gravity that hasonly a massless spin-2 excitation in its perturbative spectrum, has aninflationary period, a quasi-de Sitter phase with enough number of e-foldingsrequired to solve the horizon and related problems. The crucial ingredient inthe construction is the curvature dependence of the effective Newton'sconstant.

Inflation in pure gravity with only massless spin-2 fields