Self-interacting Warm Dark Matter

Details Self-interacting Warm Dark Matter Self-interacting Warm Dark Matter

2000-03-03

arxiv.org/abs/astro-ph/0003046v2

Phys.Rev. D62 (2000) 043522

Astronomy and Astrophysics

Astrophysics

8 pages, 2 figures, version accepted for publication in PRD

Scientific paper

10.1103/PhysRevD.62.043522

It has been shown by many independent studies that the cold dark matter scenario produces singular galactic dark halos, in strong contrast with observations. Possible remedies are that either the dark matter is warm so that it has significant thermal motion or that the dark matter has strong self interactions. We have combined these ideas to calculate the linear mass power spectrum and the spectrum of cosmic microwave background (CMB) fluctuations for self-interacting warm dark matter. Our results indicate that such models have more power on small scales than is the case for the standard warm dark matter model, with a CMB fluctuation spectrum which is nearly indistinguishable from standard cold dark matter. This enhanced small-scale power may provide better agreement with the observations than does standard warm dark matter.

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