Dark Matter and Strong CP Problem in Type IIA String Theory

TL;DR

This paper constructs a comprehensive Type IIA string theory model that addresses dark matter composition and the strong CP problem, integrating moduli stabilization, supersymmetry breaking, and phenomenological predictions.

Contribution

It presents a UV-complete string theory framework that naturally incorporates multi-component dark matter and a solution to the strong CP problem within a consistent compactification.

Findings

Predicts a multi-component dark matter scenario with axions and neutralinos.

Provides a complete moduli stabilization and supersymmetry breaking setup.

Explores embedding of the four-form flux mechanism to solve the strong CP problem.

Abstract

We present a study of dark matter and the strong CP problem within a globally consistent framework of Type IIA string theory, compactified on a $T^6/(\mathbb{Z}_2 \times \mathbb{Z}_2)$ orientifold with intersecting D6-branes (Model A), for which we provide a complete moduli stabilization and supersymmetry breaking scenario based on the STU model and the KL mechanism. This setup naturally gives rise to a 3-generation MSSM-like spectrum with $\mathcal{N}=1$ supersymmetry. Phenomenologically, the model predicts a multi-component dark matter scenario comprising both axions and neutralino. We also explore how to embed the four-form flux mechanism into Type IIA $T^6/(\mathbb{Z}_2 \times \mathbb{Z}_2)$ orientifold string theory model to address the strong CP problem. We compute the relic abundance of these candidates and explore their observational signatures. In conclusion, our analysis provides a concrete unified, UV-complete framework that successfully addresses two of the most important problems in particle physics and cosmology.