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Q-ball candidates for self-interacting dark matter

Alexander Kusenko·Paul J. Steinhardt
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Abstract

We show that non-topological 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.

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Alexander Kusenko, Paul J. Steinhardt. 2001-06-01. Q-ball candidates for self-interacting dark matter. https://doi.org/10.1103/physrevlett.87.141301

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