Phys. Rev. Lett. 100, 041303 (2008) [4 pages]Possibility of Observing Dark Matter via the Gyromagnetic Faraday EffectReceived 28 November 2006; revised 9 September 2007; published 29 January 2008 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. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.100.041303
DOI:
10.1103/PhysRevLett.100.041303
PACS:
95.35.+d, 98.62.En, 98.62.Ra, 98.70.Vc
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