2011/01/31 by Yannis Burnier, Florian Kuhnel, Florian Kühnel
Physics and Astronomy · #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Particle physics theoretical and experimental studies #gr-qc #hep-ph #hep-th
paper · pdf · doi:10.1103/physrevd.83.115002
published as Phys.Rev.D83:115002,2011 · 4 pages, 2 figures; v2: minor changes to match published PRD version
arxiv created 2011/05/28 · openalex publication_date 2011/06/02 · arxiv updated 2011/06/13 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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 setup 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.