The Dark Matter at the End of the Galaxy

Details The Dark Matter at the End of the Galaxy The Dark Matter at the End of the Galaxy

2010-10-20

arxiv.org/abs/1010.4300v1

Phys.Rev.D83:023519,2011

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

10 pages, 5 figures

Scientific paper

10.1103/PhysRevD.83.023519

Dark matter density profiles based upon Lambda-CDM cosmology motivate an ansatz velocity distribution function with fewer high velocity particles than the Maxwell-Boltzmann distribution or proposed variants. The high velocity tail of the distribution is determined by the outer slope of the dark matter halo, the large radius behavior of the Galactic dark matter density. N-body simulations of Galactic halos reproduce the high velocity behavior of this ansatz. Predictions for direct detection rates are dramatically affected for models where the threshold scattering velocity is within 30% of the escape velocity.

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