Brane World Susy Breaking

TL;DR

Brane World SUSY Breaking investigates whether separating visible and hidden sectors on different branes yields a sequestered Kahler potential and a predominantly anomaly-mediated soft spectrum. By deriving the four-dimensional Kahler potential for representative BWSB backgrounds and examining bulk-field exchange and warping, the authors show that sequestering is not generic and tree-level scalar masses of order $m_{3/2}$ arise non-universally. Warping further introduces sizable non-universal corrections, challenging the idea that extra-dimensional locality naturally solves the SUSY flavor problem. The work suggests that anomaly mediation is not a universal outcome in brane world scenarios and highlights the need for specific backgrounds or additional mechanisms to realize flavor-safe spectra.

Abstract

In brane world models of nature, supersymmetry breaking is often isolated on a distant brane in a higher dimensional space. The form of the Kahler potential in generic string and M-theory brane world backgrounds is shown to give rise to tree-level non-universal squark and slepton masses. This results from the exchange of bulk supergravity fields and warping of the internal geometry. This is contrary to the notion that bulk locality gives rise to a sequestered no-scale form of the Kahler potential with vanishing tree-level masses and solves the supersymmetric flavor problem. As a result, a radiatively generated anomaly mediated superpartner spectrum is not a generic outcome of these theories.