Gauge Symmetry and Supersymmetry Breaking From Intersecting Branes

TL;DR

This paper investigates how intersecting branes in type IIA string theory can lead to gauge symmetry and supersymmetry breaking, revealing unstable vacua with potential implications for string phenomenology.

Contribution

It demonstrates the existence of long-lived unstable vacua in intersecting NS and D-brane systems and explores their relation to wrapped branes on Calabi-Yau manifolds.

Findings

Unstable vacua are long-lived in certain parameter regions.

Vacua disappear in some configurations, indicating stability dependence.

Connections to wrapped branes and anti-branes are discussed.

Abstract

We study a system of intersecting NS and D-branes in type IIA string theory in R^{9,1}. We show that the 3+1 dimensional non-supersymmetric theory at the intersection has unstable vacua which are long-lived in some regions of the parameter space of brane configurations, and disappear in others. We also comment on the relation of our construction to systems of D and anti D-branes wrapped around cycles of non-compact Calabi-Yau manifolds and to other related systems.