Natural Supergravity Inflation

Abstract

We show that a single uncharged chiral superfield, canonically coupled to \mbox{$N=1$} supergravity with vanishing superpotential, naturally drives inflation in the early universe for a class of simple Kahler potentials. Inflation occurs due to the one-loop generation of a Kahler anomaly proportional to ${\mathbb{R}}^2$. The coefficient of this ${\mathbb{R}}^2$ term is of the correct magnitude to describe all aspects of an inflationary cosmology, including sufficient amplitude perturbations and reheating. Higher order terms proportional to ${\mathbb{R}}^n$ for $n\ge 3$ are naturally suppressed relative to the ${\mathbb{R}}^2$ term and, hence, do not destabilize the theory.

13 pages, CERN-TH.6685/92, UPR-0526T

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