Possibility of observing dark matter via the gyromagnetic Faraday effect.
If dark matter consists of cold, neutral particles with a nonzero magnetic moment, then, in the presence of an external magnetic field, a measurable gyromagnetic Faraday effect becomes possible. This enables direct constraints on the nature and distribution of such dark matter through detailed measurements of the polarization and temperature of the cosmic-microwave background radiation.
Gardner
Susan
S
Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506-0055, USA.