Brane World Susy Breaking

TL;DR

This paper investigates how the structure of the Kahler potential in brane world models affects supersymmetry breaking, revealing that non-universal scalar masses are common and challenge the idea of sequestering solutions to the flavor problem.

Contribution

It demonstrates that generic string and M-theory brane world backgrounds naturally produce non-universal scalar masses due to bulk interactions, contradicting previous assumptions of sequestering.

Findings

Tree-level non-universal squark and slepton masses arise from bulk field exchange.

Bulk locality does not guarantee a sequestered no-scale Kahler potential.

Radiative anomaly mediation is not a generic feature in these models.

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.