Axion arising from warped extra-dimensional gauge fields

Details Axion arising from warped extra-dimensional gauge fields Axion arising from warped extra-dimensional gauge fields

2011-01-26

arxiv.org/abs/1101.5156v2

Phys.Rev.D83:115002,2011

Physics

High Energy Physics

High Energy Physics - Theory

4 pages, 2 figures; v2: minor changes to match published PRD version

Scientific paper

10.1103/PhysRevD.83.115002

We present a connection between two known solutions to the strong-CP problem: the standard introduction of axions and the extra-dimensional one, relying on topological arguments. Using an equivalent lower-dimensional set-up with a warped extra-dimension but without adding any new fields, it is shown that an additional light degree of freedom appears. Like an axion, it couples to the topological charge density via Fermionic loop corrections. Its decay constant is related to the geometry of the extra dimension and is suppressed by the warping scale.

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