SUSY breaking mediation by throat fields

TL;DR

This paper explores how fields in warped throat regions of string compactifications can mediate supersymmetry breaking, potentially competing with other mechanisms and affecting the resulting soft terms in the visible sector.

Contribution

It introduces a model where throat-localized vector fields mediate SUSY breaking, highlighting their significance despite large masses and their origin from throat isometries.

Findings

Throat vector fields can compete with modulus-anomaly mediation.

Heavy chiral superfields have subdominant effects.

Throat isometries like SO(4) influence mediation mechanisms.

Abstract

We investigate, in the general framework of KKLT, the mediation of supersymmetry breaking by fields propagating in the strongly warped region of the compactification manifold ('throat fields'). Such fields can couple both to the supersymmetry breaking sector at the IR end of the throat and to the visible sector at the UV end. We model the supersymmetry breaking sector by a chiral superfield which develops an F-term vacuum expectation value. It turns out that the mediation effect of vector multiplets propagating in the throat can compete with modulus-anomaly mediation. Moreover, such vector fields are naturally present as the gauge fields arising from isometries of the throat (most notably the SO(4) isometry of the Klebanov-Strassler solution). Their mediation effect is important in spite of their large 4d mass. The latter is due to the breaking of the throat isometry by the compact manifold at the UV end of the throat. The contribution from heavy chiral superfields is found to be subdominant.