Compact extra-dimensions as solution to the strong CP problem

Details Compact extra-dimensions as solution to the strong CP problem Compact extra-dimensions as solution to the strong CP problem

2008-11-07

arxiv.org/abs/0811.1163v3

Phys.Rev.D80:125004,2009

Physics

High Energy Physics

High Energy Physics - Theory

Discussion added

Scientific paper

10.1103/PhysRevD.80.125004

We show that the strong CP problem can, in principle, be solved dynamically by adding extra-dimensions with compact topology. To this aim we consider a toy model for QCD, which contains a vacuum angle and a strong CP like problem. We further consider a higher dimensional theory, which has a trivial vacuum structure and which reproduces the perturbative properties of the toy model in the low-energy limit. In the weak coupling regime, where our computations are valid, we show that the vacuum structure of the low-energy action is still trivial and the strong CP problem is solved. No axion-like particle occur in this setup and therefore it is not ruled out by astrophysical bounds.

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