Chiral 4d String Vacua with D-branes and Moduli Stabilization

TL;DR

This paper constructs type IIB string models with D-branes and fluxes that produce chiral spectra similar to the Standard Model while stabilizing most moduli, combining phenomenological relevance with moduli stabilization.

Contribution

It presents explicit non-supersymmetric string models with chiral spectra and stabilized moduli, using D-branes and fluxes on orbifolds and orientifolds.

Findings

Models yield Standard Model-like chiral spectra.

Most moduli are stabilized by flux-induced scalar potential.

Explicit constructions on $ ext{T}^6$ and orbifolds.

Abstract

We discuss type IIB orientifolds with D-branes, and NSNS and RR field strength fluxes, with D-brane sectors leading to open string spectra with non-abelian gauge symmetry and charged chiral fermions. The closed string field strengths generate a scalar potential stabilizing most moduli. Hence the models combine the advantages of leading to phenomenologically interesting (and even semirealistic) chiral open string spectra, and of stabilizing the dilaton and most geometric moduli. We describe the explicit construction of two classes of non-supersymmetric models on $\IT^6$ and orbifolds/orientifolds thereof, with chiral gauge sector arising from configurations of D3-branes at singularities, and from D9-branes with non-trivial world-volume magnetic fields. The latter examples yield the chiral spectrum of just the Standard Model.