Three-Family Supersymmetric Pati-Salam Flux Models from Rigid D-Branes

TL;DR

This paper constructs new three-family flux models in Type IIB string theory with stabilized moduli, using rigid D-branes and fluxes, leading to Pati-Salam models that can break down to the Standard Model.

Contribution

It introduces novel three-family flux models on a specific orientifold, employing background fluxes and rigid D-branes to stabilize moduli and realize realistic gauge symmetry breaking.

Findings

Successfully stabilizes complex structure moduli and axio-dilaton with fluxes.

Constructs Pati-Salam models that break to the Standard Model via Higgs mechanism.

Ensures all consistency conditions, including supersymmetry and tadpole cancellation.

Abstract

Intersecting D-brane model building often suffer from the unstabilized open-string moduli, leading to the unwanted massless adjoint scalars. In our previous work arXiv:2505.03664, this issue was resolved by employing the rigid D6-branes on the $\mathbb{T}^6/(\mathbb{Z}_2 \times \mathbb{Z}_2^\prime)$ orientifold with discrete torsion, where fractional cycles eliminate all adjoint scalars. In this paper, we construct new three-family flux models in the Type IIB setup on $\mathbb{T}^6/(\mathbb{Z}_2 \times \mathbb{Z}_2)$, T-dual to the Type IIA rigid D6-brane construction with discrete torsion, by introducing the quantized background $G_3$ flux that stabilizes the closed-string complex structure moduli and axio-dilaton. The resulting Pati-Salam gauge symmetry can be spontaneously broken down to the Standard Model via a supersymmetry-preserving Higgs mechanism. All the consistency conditions, including $\mathcal{N}=1$ supersymmetry, RR tadpole cancellation, and K-theory constraints, are satisfied. We present the complete particle spectra for these models and discuss how exotic states dynamically decouple through strong dynamics in the hidden sector.