Strings from Orientifolds

TL;DR

This paper constructs 1+1 dimensional models with chiral supersymmetry via orientifolds of type IIB string theory on an eight-torus, analyzing their brane configurations and anomaly cancellation.

Contribution

It introduces new chiral supersymmetric models in low dimensions by applying orientifold techniques to type IIB string theory on a torus.

Findings

Residual chiral supersymmetry (0,8), (0,4), (0,2) achieved

Gravitational anomalies are shown to cancel in all models

Models include various brane configurations with Dirichlet strings, fivebranes, and ninebranes

Abstract

We construct models in 1+1 dimensions with chiral (0,N) supersymmetry by taking orientifolds of type IIB on an eight-torus identified by different numbers of reflections. The resulting models have Dirichlet strings, fivebranes and ninebranes stretched along different directions. The cases we study in detail have residual chiral supersymmetry (0,8), (0,4) and (0,2). The gravitational anomaly in all cases is shown to cancel.