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Published 2010 | public
Book Section - Chapter

Dark matter and dark radiation


We explore the feasibility and astrophysical consequences of a new long-range U(1) gauge field ("dark electromagnetism") that couples only to dark matter, not to the Standard Model. The dark matter consists of an equal number of positive and negative charges under the new force, but annihilations are suppressed if the dark matter mass is sufficiently high and the dark fine-structure constant α is sufficiently small. The correct relic abundance can be obtained if the dark matter also couples to the conventional weak interactions, and we verify that this is consistent with particle-physics constraints. The primary limit on a comes from the demand that the dark matter be effectively collisionless in galactic dynamics, which implies α ≾ 10^(-3) for TeV-scale dark matter. These values are easily compatible with constraints from structure formation and primordial nucleosynthesis. We raise the prospect of interesting new plasma effects in dark matter dynamics, which remain to be explored. This proceedings is based on the work presented originally in.(1)

Additional Information

© 2010 World Scientific Pub. Co. M. B. would like to thank the organizers of the DARK 2009 conference and the Physics Department in the University of Canterbury. This wok was supported by DoE DE-FG03-92-ER40701 and the Gordon and Betty Moore Foundation.

Additional details

August 19, 2023
October 20, 2023