arXiv:hep-ph/9203206·v1·High Energy Physics — Phenomenology
Solutions to the strong CP problem in a world with gravity
R. Holman🇺🇸 · S.D.H. Hsu🇺🇸 · T. Kephart🇺🇸 · E. Kolb🇺🇸 · R. Watkins🇺🇸 · L. Widrow🇺🇸
Abstract
We examine the sensitivity of several solutions of the strong-CP problem to violations of global symmetries by Planck scale physics. We find that the Peccei-Quinn solution is extremely sensitive to U(1)_PQ violating operators of dimension less than 10. We construct models in which the PQ symmetry is protected by gauge symmetries to the requisite level.
Comments: 10 pages