CP in Orbifold Models

Abstract

We study CP in orbifold models. It is found that the orbifolds always have some automorphisms as CP symmetry. The symmetries are restricted non-trivially due to geometrical structure of the orbifolds. Explicit analysis on Yukawa couplings also shows that CP is not violated in orbifold models.

11 pages, KOBE-TH-94-06, Kanazawa-94-20, Latex file

References in corpus (7)

• Of CP and other Gauge Symmetries in String Theory
• Is CP a Gauge Symmetry?
• Complete structure of Z_n Yukawa couplings
• Higher Twisted Sector Couplings of $Z_N$ Orbifolds
• Yukawa Couplings for Bosonic $Z_N$ Orbifolds: Their Moduli and Twisted Sector Dependence
• Small SUSY phases in string-inspired supergravity
• Moduli and Twisted Sector Dependence of Z_N x Z_M Orbifold Couplings

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• Challenge for spontaneous CP violation in Type IIB orientifolds with fluxes
• CP violation in supersymmetric model with non-degenerate A-terms
• CP-violating phase on magnetized toroidal orbifolds
• Heterotic Yukawa couplings and continuous Wilson lines
• Loop Fayet-Iliopoulos terms in $T^2/Z_2$ models: instability and moduli stabilization
• The KM phase in semi-realistic heterotic orbifold models
• Selection Rules for Nonrenormalizable Couplings in Superstring Theories
• Phases and CP Violation in SUSY
• CP Violation due to Compactification
• Quark Mass Matrices in Orbifold Models
• Heterotic string backgrounds and CP violation
• Flat Directions in $Z_{2n}$ Orbifold Models
• CP Violation beyond the Standard Model