Dark matter at the end of the Galaxy
Journal Article
·
· Physical Review. D, Particles Fields
- PCTS, Princeton University, Princeton, New Jersey 08540 (United States)
- Kavli Institute for Particle Astrophysics and Cosmology and Physics Department, Stanford University, Stanford, California 94305 (United States)
- Particle and Particle Astrophysics Department, SLAC National Accelerator Laboratory, Menlo Park, California 94025 (United States)
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.
- OSTI ID:
- 21503940
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 83, Issue 2; Other Information: DOI: 10.1103/PhysRevD.83.023519; (c) 2011 American Institute of Physics; ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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