CP violation and modular symmetries

Details CP violation and modular symmetries CP violation and modular symmetries

2001-05-27

arxiv.org/abs/hep-ph/0105285v2

Phys.Rev. D64 (2001) 056005

Physics

High Energy Physics

High Energy Physics - Phenomenology

6 pages, REVTeX 4b5+amssymb. 2 references added, substantially the same as published version

Scientific paper

10.1103/PhysRevD.64.056005

We reconsider the origin of CP violation in fundamental theory. Existing string models of spontaneous CP violation make ambiguous predictions, due to the arbitrariness of CP transformation and the apparent non-invariance of the results under duality. We find an unambiguous modular CP invariance condition, applicable to predictive models of spontaneous CP violation, which circumvents these problems; it strongly constrains CP violation by heterotic string moduli. The dilaton is also evaluated as a source of CP violation, but is likely experimentally excluded. We consider the prospects for explaining CP violation in strongly-coupled strings and brane worlds.

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