CP in Orbifold Models

TL;DR

This paper investigates CP symmetry in orbifold models, demonstrating that orbifolds inherently possess automorphisms acting as CP and that CP violation does not occur in these models due to geometric constraints.

Contribution

It provides a detailed analysis showing that orbifolds always have CP automorphisms and that CP violation is prevented by their geometric structure.

Findings

Orbifolds always have automorphisms acting as CP symmetry.

CP is not violated in orbifold models.

Geometrical structure restricts CP symmetry transformations.

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.