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The search for axions

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The axion is a light pseudoscalar particle predicted to exist as a consequence of the Peccei-Quinn solution to the strong-CP problem. Its abundant production in the early Universe along with its stability and insignificant interaction cross-section make it a prime dark matter candidate. This report summarises the search for dark matter axions using resonant microwave cavities as well as searches for axions produced in the Sun and in the laboratory. All of these current experiments focus on the axion-photon interaction, as coherent axion-photon mixing in strong magnetic fields of large spatial extent can make up for the extraordinary weakness of the the coupling of axions to photons.

Keywords: ADMX; CAST; Peccei-Quinn solution; RBFT; axion; dark matter; microwave cavity; strong CP problem

Document Type: Research Article


Affiliations: Lawrence Livermore National Laboratory, Livermore, CA, USA

Publication date: 2008-07-01

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