Low-scale supergravity inflation with R-symmetry

Abstract

We study a supergravity model of inflation with R-symmetry and a single scalar field, the inflaton, slowly rolling away from the origin. The scales of inflation can be as low as the supersymmetry breaking scale of 10^10 GeV or even the electroweak scale of 10^3 GeV which could be relevant in the context of theories with submillimiter dimensions. Exact analytical solutions are presented and a comparison with related models is given.

11 pages, 3 figures; added discussion and references in section 2; corrected Eqs. 24 and 26; minor corrections in the table and figures; one fig. added in section 1. Accepted for publication in Physics Letters B