Extra dimensions and the strong CP problem

Details Extra dimensions and the strong CP problem Extra dimensions and the strong CP problem

2001-04-17

arxiv.org/abs/hep-ph/0104158v1

Phys.Rev.Lett. 87 (2001) 171601

Physics

High Energy Physics

High Energy Physics - Phenomenology

7 pp., latex, no figures

Scientific paper

10.1103/PhysRevLett.87.171601

In higher-dimensional theories such as Brane World models with quasi-localized non-Abelian gauge fields the vacuum structure turns out to be trivial. Since the gauge theory behaves at large distances as a $4+\delta$-dimensional and thus the topology of the infinity is that of of $S^{3+\delta}$ rather than $S^{3}$, the set of gauge mappings are homotopically trivial and the CP-violating $\theta$-term vanishes on the brane world-volume. As well there are no contributions to the $\theta$-term from the higher-dimensional solitonic configurations. In this way, the strong CP problem is absent in the models with quasi-localized gluons.

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