The search for axion dark matter

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Particle-Theory And Field-Theory Models Of The Early Universe, Observational Cosmology, Charge Conjugation, Parity, Time Reversal, And Other Discrete Symmetries

Scientific paper

This talk reviews the original motivation for the axion as a solution to the strong CP problem and the constraints that have been placed on the axion by experimental searches and by astrophysical and cosmological considerations. As a result of the bounds, the axion mass is presently restricted to a window extending from about 10-2 eV to about 10-6 eV. In this window, axions are a form of cold dark matter. It is possible to detect galactic halo axions by stimulating their conversion to photons in a laboratory magnetic field. I'll report on two experiments of this type, one at Lawrence Livermore National Laboratory and the other at Kyoto University. I'll also discuss what can be learned about the structure of our galactic halo if a signal is found.

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