Reflections on the Strong CP Problem

Details Reflections on the Strong CP Problem Reflections on the Strong CP Problem

1998-07-27

arxiv.org/abs/hep-ph/9807514v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages, Latex file

Scientific paper

10.1016/S0920-5632(98)00496-4

I discuss how anomalies affect classical symmetries and how, in turn, the non-trivial nature of the gauge theory vacuum makes these quantum corrections troublesome. Although no solution seems in sight for the cosmological constant problem, I examine three possible approaches to the strong CP problem involving vacuum dynamics, an additional chiral symmetry, and the possibility of spontaneous CP or P breaking. All of these "solutions" have their own problems and suggest that, at a deep level, we do not understand the nature of CP violation. Nevertheless, it remains extremely important to search for experimental signals predicted by these theoretical "solutions", like invisible axions.

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