Gravity Mediation in 6d Brane-World Supergravity

TL;DR

This paper investigates gravity-mediated supersymmetry breaking in a 6D brane-world supergravity model, revealing non-sequestered Kahler potential and conditions for positive scalar soft masses at tree level.

Contribution

It constructs a supersymmetric bulk-brane action in 6D supergravity and analyzes moduli coupling and soft mass generation, highlighting new mechanisms for SUSY breaking mediation.

Findings

Low energy Kahler potential is non-sequestered.

Gravity mediation can occur at tree level.

Scalar soft mass squared can be positive and comparable to anomaly mediation.

Abstract

We consider the gravity-mediated SUSY breaking within the effective theory of six-dimensional brane-world supergravity. We construct the supersymmetric bulk-brane action by Noether method and find the nontrivial moduli coupling of the brane F- and D-terms. We find that the low energy Kahler potential is not of sequestered form, so gravity mediation may occur at tree level. In moduli stabilization with anomaly effects included, the scalar soft mass squared can be positive at tree level and it can be comparable to the anomaly mediation.