SUSY breaking mediation by throat fields

TL;DR

The paper analyzes how SUSY breaking in KKLT-like constructions with warped throats can be mediated to the UV-visible sector by fields propagating in the throat. It identifies two throat-field channels: bulk vector fields associated with the throat's SO$(4)$ isometry, which induce a D-term that yields UV soft masses $m^2\sim\omega^4$ competitive with modulus-anomaly mediation, and heavy throat chiral fields whose contributions are subdominant ($F_Y\sim\omega^4$). The results demonstrate that vector mediation can be a leading, calculable effect in these setups, challenging the assumption of strict sequestering. The authors outline a path toward a concrete 5d effective description to compute soft terms and discuss open issues such as loop corrections and model-specific couplings.

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.