Sgoldstino inflation

Abstract

We discuss the possibility that inflation is driven by the sgoldstino, the\nsuperpartner of the goldstino. Unlike in generic supergravity scenarios, the\nsgoldstino decouples from all other fields in the theory, which allows for a\nsimple and robust inflationary model. We argue that the two-field model given\nby this single complex scalar correctly captures the full multifield\ninflationary phenomenology. On the other hand, the assumption of stability,\nalong the entire inflationary trajectory, of the supersymmetry-preserving\nsector that is integrated out leads to supplementary constraints on the parent\nsupergravity. We investigate small field, large field and hybrid sgoldstino\ninflation scenarios and provide some working examples. They are subject to the\nusual fine-tuning issues that are common to all supergravity models of\ninflation. We comment on some other recently proposed sgoldstino inflation\nmodels.\n