Supersymmetry breaking in ISS coupled to gravity

TL;DR

This paper investigates how supersymmetry breaking occurs in an ISS model when coupled to gravity, resulting in a unique gauge mediation scenario with a significant mass split between gauginos and scalars.

Contribution

It introduces a gravity-coupled ISS model with a dynamically vanishing cosmological constant, leading to a novel gauge mediation mechanism with distinctive soft mass spectrum.

Findings

Non-zero F-terms for squarks due to gravitational effects

Realization of gauge mediation with a large gaugino-scalar mass split

Consistent supersymmetry breaking with vanishing cosmological constant

Abstract

We analyse the breakdown of supersymmetry in an ISS model in the presence of gravity, under the requirement that the cosmological constant vanishes dynamically. The gravitational backreaction is calculated in the metastable minimum and, in conjuction with the condition V=0, this is shown to generate non-zero F-terms for the squarks. Once the squarks are coupled to the messenger sector, a gauge mediation scheme is realised and it leads to a distinctive soft spectrum, with a two order of magnitude split between the gaugino and the soft scalar masses.