CP Violation and Dilaton Stabilization in Heterotic String Models

Abstract

We study the possibility of spontaneous CP violation in string models with the dilaton field stabilized at a phenomenologically acceptable value. We consider three mechanisms to stabilize the dilaton: multiple gaugino condensates, a nonperturbative Kahler potential, and a superpotential based on S-duality, and analyze consequent CP phases in the soft SUSY breaking terms. Due to non-universality forced upon the theory by requiring a non-trivial CKM phase, the EDM problem becomes more severe. Even if there are no complex phases in the VEVs of the SUSY breaking fields, the electric dipole moments are overproduced by orders of magnitude. We also address the question of modular invariance of the physical CP phases.

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References in corpus (4)

• EDM Constraints in Supersymmetric Theories
• CP violation and modular symmetries
• The CKM Phase in Heterotic Orbifold Models
• CP and Flavour in Effective Type I String Models

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• Flavour violation in general supergravity
• Quark and Lepton Masses and Mixing Angles from Superstring Constructions
• Heterotic string backgrounds and CP violation
• CP violation and CKM predictions from Discrete Torsion
• CP violation in supersymmetric models with Hermitian Yukawa couplings and A-terms
• Towards a Realistic Picture of CP Violation in Heterotic String Models
• Radiative CP Phases in Supergravity Theories
• Can the CKM phase be the only source of CP violation?
• Instanton effects and linear-chiral duality
• Full Component Lagrangian in the Linear Multiplet Formulation of String-inspired Effective Supergravity