The Dark Matter at the End of the Galaxy
Cosmology and Nongalactic Astrophysics
2011-02-25 v1 Astrophysics of Galaxies
High Energy Astrophysical Phenomena
High Energy Physics - Phenomenology
Abstract
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.
Keywords
Cite
@article{arxiv.1010.4300,
title = {The Dark Matter at the End of the Galaxy},
author = {Mariangela Lisanti and Louis E. Strigari and Jay G. Wacker and Risa H. Wechsler},
journal= {arXiv preprint arXiv:1010.4300},
year = {2011}
}
Comments
10 pages, 5 figures