SuperWIMP Solutions to Small Scale Structure Problems

Details SuperWIMP Solutions to Small Scale Structure Problems SuperWIMP Solutions to Small Scale Structure Problems

2005-07-12

arxiv.org/abs/hep-ph/0507150v2

Phys.Rev.Lett.95:181301,2005

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 2 figures, published version

Scientific paper

10.1103/PhysRevLett.95.181301

Collisionless, cold dark matter in the form of weakly-interacting massive particles (WIMPs) is well-motivated in particle physics, naturally yields the observed relic density, and successfully explains structure formation on large scales. On small scales, however, it predicts too much power, leading to cuspy halos, dense cores, and large numbers of subhalos, in apparent conflict with observations. We consider superWIMP dark matter, produced with large velocity in late decays at times 10^5 s - 10^8 s. As analyzed by Kaplinghat in a more general setting, we find that superWIMPs have sufficiently large free-streaming lengths and low phase space densities to help resolve small scale structure problems while preserving all of the above-mentioned WIMP virtues.

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