Journal
PHYSICAL REVIEW D
Volume 83, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.83.023519
Keywords
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Funding
- DOE [DE-AC03-76SF00515]
- Sloan Foundation
- NASA [HF-01225.01, NAS 5-26555]
- Simons Foundation
- L. H. C. Theory Initiative
- Division Of Physics
- Direct For Mathematical & Physical Scien [705682] Funding Source: National Science Foundation
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Dark matter density profiles based upon ACDM 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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