Type I Strings with F- and B-Flux

TL;DR

This paper constructs non-supersymmetric and supersymmetric four- and six-dimensional string models with background fluxes, leading to chiral fermions and intersecting brane descriptions, expanding the landscape of string compactifications.

Contribution

It introduces novel non-supersymmetric toroidal compactifications of type I string theory with combined NSNS and magnetic fluxes, producing models with realistic features.

Findings

Models with three generations of chiral fermions

Presence of both supersymmetric and non-supersymmetric solutions

All models have T-dual descriptions as intersecting brane worlds

Abstract

We present non-supersymmetric toroidal compactifications of type I string theory with both constant background NSNS two-form flux and non-trivial magnetic flux on the various D9-branes. The non-vanishing B-flux admits four-dimensional models with three generations of chiral fermions in standard model like gauge groups. Additionally, we consider the orbifold T^4/Z_2, again with both kinds of background flux present, leading to non-supersymmetric as well as supersymmetric models in six dimensions. All models have T-dual descriptions as intersecting brane worlds.