The Dark Matter at the End of the Galaxy

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.

10 pages, 5 figures

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Cited by in corpus (5)

• Interpreting Dark Matter Direct Detection Independently of the Local Velocity and Density Distribution
• Complementarity of Dark Matter Direct Detection Targets
• Search for inelastic dark matter with the CDMS II experiment
• A dark force for baryons
• Direct detection data and possible hints for low-mass WIMPs