Phys. Rev. Lett. 87, 141301 (2001) [4 pages]Q-Ball Candidates for Self-Interacting Dark Matter |
PRL Celebrates 50 Years
This Week's Milestone Letters are from 1981: |
Alexander Kusenko1,2 and Paul J. Steinhardt3
1Department of Physics and Astronomy, UCLA, Los Angeles, California 90095-1547
2RIKEN BNL Research Center, Brookhaven National Laboratory, Upton, New York 11973
3Department of Physics, Princeton University, Princeton, New Jersey 08540
Received 1 June 2001; published 13 September 2001
We show that nontopological solitons, known as Q-balls, are promising candidates for self-interacting dark matter. They can satisfy the cross-section requirements for a broad range of masses. Unlike previously considered examples, Q-balls can stick together after collision, reducing the effective self-interaction rate to a negligible value after a few collisions per particle. This feature modifies predictions for halo formation. We also discuss the possibility that Q-balls have large interaction cross sections with ordinary matter.
©2001 The American Physical Society
URL: http://link.aps.org/abstract/PRL/v87/e141301
DOI: 10.1103/PhysRevLett.87.141301
PACS: 95.35.+d, 98.80.Cq
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