Abstract
We identify a natural way to embed CP symmetry and its violation in string theory. The CP symmetry of the low energy effective theory is broken by the presence of heavy string modes. CP violation is the result of an interplay of CP and flavor symmetry. CP violating decays of the heavy modes could originate a cosmological matter-antimatter asymmetry.
Highlights
Aspects of CP symmetry and its violation play a crucial role in several physics phenomena
We are confronted with the following questions: What is the origin of CP symmetry and its violation? Is there a relation to the flavor symmetries in the standard model (SM) of particle physics? Is there a “theory of CP” in the ultraviolet completion of the SM that explains both the origin of CP symmetry and its breakdown?
Our approach is new in the following sense: While it has been known that extra dimensions provide an origin of discrete symmetries [6,7,8], a more recent insight, based on the original idea of “explicit geometrical CP violation” [9], is that a large class of discrete groups is generally incompatible with CP [10]
Summary
Hans Peter Nilles,1, ∗ Michael Ratz,2, † Andreas Trautner,1, ‡ and Patrick K.S. Vaudrevange3, § 1Bethe Center for Theoretical Physics und Physikalisches Institut der Universitat Bonn, Nussallee 12, 53115 Bonn, Germany. We identify a natural way to embed CP symmetry and its violation in string theory. The CP symmetry of the low energy effective theory is broken by the presence of heavy string modes. CP violation is the result of an interplay of CP and flavor symmetry. CP violating decays of the heavy modes could originate a cosmological matter-antimatter asymmetry
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