Sequestered gravity in gauge mediation

TL;DR

This paper introduces a new string-theoretic supersymmetry breaking mechanism driven by Scherk-Schwarz deformation, which combines advantages of gravity and gauge mediation, and predicts a high-scale gravitino mass with gauge-mediated soft terms.

Contribution

It proposes a novel supersymmetry breaking scenario in string theory using Scherk-Schwarz deformation, with unique mediation via massive messengers and implications for dark matter.

Findings

Gravitino and gaugino masses fixed at around 10^{10} GeV.

Supersymmetry breaking mediated mainly by gauge interactions.

Potential for neutralino as dark matter candidate.

Abstract

We present a novel mechanism of supersymmetry breaking embeddable in string theory and simultaneously sharing the main advantages of (sequestered) gravity and gauge mediation. It is driven by a Scherk-Schwarz deformation along a compact extra dimension, transverse to a D-brane stack supporting the supersymmetric extension of the Standard Model. This fixes the magnitude of the gravitino mass, together with that of the gauginos of a bulk gauge group, at a scale as high as $10^{10}$ GeV. Supersymmetry breaking is mediated to the observable sector dominantly by gauge interactions using massive messengers transforming non-trivially under the bulk and Standard Model gauge groups and leading to a neutralino LSP as dark matter candidate. The Higgsino mass $\mu$ and soft Higgs-bilinear B$\mu$-term could be generated at the same order of magnitude as the other soft terms by effective supergravity couplings as in the Giudice-Masiero mechanism.