On Uplifted SUSY-Breaking Vacua and Direct Mediation in Generalized SQCD

TL;DR

This paper investigates models of direct gauge mediation using generalized SQCD, focusing on uplifted vacua suitable for cosmology, and identifies conditions under which these vacua are viable, especially in SQCD with an adjoint.

Contribution

It demonstrates that pure SQCD is not viable for uplifted vacua, but SQCD with an adjoint can support metastable vacua with the right conditions.

Findings

Pure SQCD is not viable for uplifted vacua.

SQCD with an adjoint can support metastable vacua with suitable conditions.

A large tadpole term in the scalar potential is necessary for viable models.

Abstract

We search for viable models of direct gauge mediation, where the SUSY-breaking sector is (generalized) SQCD, which has cosmologically favorable uplifted vacua even when the reheating temperature is well above the messenger scale. This requires a relatively large tadpole term in the scalar potential for the spurion field X and, consequently, we argue that pure (deformed) SQCD is not a viable model. On the other hand, in SQCD with an adjoint, which is natural e.g. in string theory, assuming an appropriate sign in the Kahler potential for X, such metastable vacua are possible.