Non-supersymmetric Orientifolds with D-branes at Angles

TL;DR

This paper constructs non-supersymmetric orientifold models in string theory using D-branes at angles, exploring how different configurations affect gauge groups and matter content in compactified spaces.

Contribution

It introduces specific orientifold models with supersymmetry breaking via branes at angles, detailing their geometric and group-theoretic properties.

Findings

Models exhibit varied gauge groups and matter content.

D-branes at angles lead to supersymmetry breaking.

Different geometric actions produce distinct intersecting brane configurations.

Abstract

We present special classes of orientifold models involving supersymmetry breaking via branes at angles. Type II superstring theories are compactified on a two torus times a four-dimensional orbifold. Combining worldsheet parity with a reflection of half of the compact coordinates leads to D6-branes at angles which are mapped onto each other by the orbifold group, while applying the geometric action only along one coordinate leads to intersecting D8-branes with non-trivial transformation properties under the orbifold group. The models differ in the gauge groups and matter content.