Physical Review D - Particles, Fields, Gravitation, and Cosmology
We consider the consequences of a neutral dark-matter particle with a nonzero electric and/or magnetic dipole moment. Theoretical constraints, as well as constraints from direct searches, precision tests of the standard-model, the cosmic microwave background and matter power spectra, and cosmic gamma rays, are included. We find that a relatively light particle with mass between an MeV and a few GeV and an electric or magnetic dipole as large as ∼3×10−16e cm (roughly 1.6×10−5μB) satisfies all experimental and observational bounds. Some of the remaining parameter space may be probed with forthcoming more sensitive direct searches and with the Gamma-Ray Large Area Space Telescope.
Sigurdson, Kris; Doran, Michael; Kurylov, Andriy; Caldwell, Robert R.; and Kamionkowski, Marc, "Dark-Matter Electric and Magnetic Dipole Moments" (2004). Open Dartmouth: Faculty Open Access Articles. 1976.