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Dark Matter and Strong CP Problem in Type IIA String Theory

Yang Liu

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). 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.

Dark Matter and Strong CP Problem in Type IIA String Theory

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 orientifold with intersecting D6-branes (Model A). This setup naturally gives rise to a 3-generation MSSM-like spectrum with 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 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.
Paper Structure (17 sections, 113 equations, 1 table)

This paper contains 17 sections, 113 equations, 1 table.

Table of Contents

  1. Introduction
  2. The set-up, axions and neutralinos in Model A
  3. The brane set-up of Model A
  4. Axions
  5. Neutralinos
  6. Axionic solution to strong CP problem
  7. A mechanism for solving the strong CP problem
  8. Multiple 3-forms
  9. Four-form fluxes in type IIA $T^6/(\mathbb{Z}_2 \times \mathbb{Z}_2)$ orientifolds and QCD axion
  10. Embedding the mechanism in Model A: from generality to specificity
  11. Phenomenological predictions and other dark matter candidates
  12. Rotation of the CMB polarization
  13. The relic abundance of neutralinos and LHC constraints
  14. Brief discussion on other dark matter candidates
  15. A numerical example
  16. ...and 2 more sections