Fine-tuning problems in type IIA string theory

• 出版年: Journal of High Energy Physics
• 第一著者: Yang Liu
• フォーマット: 論文
• 言語: 英語
• 出版事項: SpringerOpen 2025-08-01
• 主題: Flux Compactifications; String and Brane Phenomenology; String Models; Supersymmetry Breaking
• オンライン･アクセス: https://doi.org/10.1007/JHEP08(2025)070

Abstract We demonstrate a unified resolution to the strong CP, hierarchy, and cosmological constant problems in type IIA flux compactifications, via 4-form fluxes and KL stabilization. We show that the strong CP problem can be effectively “solved” in type IIA orientifold constructions, particularly in the type IIA T 6/(ℤ 2 × ℤ 2) model. Building on this, we explore whether the remaining two fine-tuning problems can also be resolved within the same setup. To obtain a small cosmological constant, we adopt the KL scenario and find that, in order to avoid conflicts with the swampland distance conjecture and to eliminate the need for fine-tuning, the perturbative superpotential ∆W must take the form f 0 U 3. Additionally, we compute the gravitino mass. This allows for a resolution of the hierarchy problem without introducing fine-tuning if gravitino mass lies below 100 TeV. Taken together, these results suggest that the type IIA T 6/(ℤ 2 × ℤ 2) orientifold model provides a promising framework in which all three fine-tuning problems may be addressed simultaneously.