Geometric inflation

doi:10.1016/j.physletb.2020.135242

Geometric inflation

2020-03-01

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DOI：10.1016/j.physletb.2020.135242

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We argue that the presence of an inflationary epoch is a natural, almost unavoidable, consequence of the existence of a sensible action involving an infinite tower of higher-curvature corrections to the Einstein-Hilbert action. No additional fields besides the metric are required. We show that a family of such corrections giving rise to a well-posed cosmological evolution exists and automatically replaces the radiation-dominated early-universe Big Bang by a period of exponential growth of the scale factor, which is gracefully connected with standard late-time ACDM cosmology. The class of higher-curvature theories giving rise to sensible cosmological evolution share additional remarkable properties such as the existence of Schwarzschild-like non-hairy black holes, or the fact that, just like for Einstein gravity, the only degrees of freedom propagated on the vacuum are those of the standard graviton. (C) 2020 The Author(s). Published by Elsevier B.V.

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QUARTIC EFFECTIVE ACTION

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Geometric inflation

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