Dark matter at the end of the Galaxy

2010/10/20 by Mariangela Lisanti, Louis E. Strigari, Jay G. Wacker +1 · 2 citations
Physics and Astronomy · #Ansatz #Astrophysics #Cosmology #Cosmology and Gravitation Theories #Cuspy halo problem #Dark Matter and Cosmic Phenomena #Dark energy #Dark fluid #Dark matter #Dark matter halo #Galactic halo #Galaxies: Formation, Evolution, Phenomena #Galaxy #Halo #Mathematical physics #Physics #RADIUS #Scalar field dark matter #astro-ph.CO #astro-ph.GA #astro-ph.HE #hep-ph

paper · pdf · doi:10.1103/physrevd.83.023519

published as Phys.Rev.D83:023519,2011 · 10 pages, 5 figures

arxiv created 2010/10/20 · openalex publication_date 2011/01/24 · arxiv updated 2011/02/25 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

Dark matter density profiles based upon \ensuremathΛCDM 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.

Citations

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Cited by

• The impact of baryons on the direct detection of dark matter
• Solar gamma ray constraints on dark matter annihilation to secluded mediators