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Published July 15, 2001 | Published
Journal Article Open

Kinetic decoupling of neutralino dark matter


After neutralinos cease annihilating in the early Universe, they may still scatter elastically from other particles in the primordial plasma. At some point in time, however, they will eventually stop scattering. We calculate the cross sections for neutralino elastic scattering from standard-model particles to determine the time at which this kinetic decoupling occurs. We show that kinetic decoupling occurs above a temperature T∼MeV. Thereafter, neutralinos act as collisionless cold dark matter.

Additional Information

© 2001 The American Physical Society. Received 27 March 2001; published 25 June 2001. X.C. acknowledges the hospitality of the TAPIR group at Caltech where part of this work was completed. X.C. was supported in part by the U.S. Department of Energy under grant No. DE-FG02-91ER40690. M.K. was supported by the DOE under DE-FG03-92-ER40701, the NSF under AST-0096023, and NASA under NAG5-8506. X.Z. was supported in part by the National Natural Science Foundation of China and the Ministry of Science and Technology of China under grant No. NKBRSF G19990754.

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