Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1992-06-30
Phys.Lett. B322 (1994) 374-381; Erratum-ibid. B326 (1994) 329
Physics
High Energy Physics
High Energy Physics - Phenomenology
LBL-32491, June, 1992
Scientific paper
10.1016/0370-2693(94)91168-1
A non-perturbative solution to strong CP problem is proposed. It is shown that the gauge orbit space with gauge potentials and gauge tranformations restricted on the space boundary in non-abelian gauge theories with a $\theta$ term has a magnetic monopole structure if there is a magnetic monopole in the ordinary space. The Dirac's quantization condition in the corresponding quantum theories ensures that the vacuum angle $\theta$ in the gauge theories must be quantized. The quantization rule is derived as $\theta=2\pi/n~(n\neq 0)$ with n being the topological charge of the magnetic monopole. Therefore, we conclude that the strong CP problem is automatically solved non-perturbatively with the existence of a magnetic monopole of charge $\pm 1$ with $\theta=\pm 2\pi$. This is also true when the total magnetic charge of monopoles are very large ($|n|\geq 10^92\pi$) if it is consistent with the abundance of magnetic monopoles. This implies that the fact that the strong CP violation can be only so small or vanishing may be a signal for the existence of magnetic monopoles.
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