Dark matter at the end of the Galaxy

Journal Article · Sat Jan 15 04:00:00 EST 2011 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.83.023519· OSTI ID:21503940

Lisanti, Mariangela ^[1]; Strigari, Louis E ^[2]; Wacker, Jay G ^[3]; Wechsler, Risa H ^[3]

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1. PCTS, Princeton University, Princeton, New Jersey 08540 (United States)
2. Kavli Institute for Particle Astrophysics and Cosmology and Physics Department, Stanford University, Stanford, California 94305 (United States)
3. 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, Journal Name: Physical Review. D, Particles Fields Journal Issue: 2 Vol. 83; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BOLTZMANN STATISTICS
COSMOLOGY
DENSITY
DETECTION
DISTRIBUTION
DISTRIBUTION FUNCTIONS
FORECASTING
FUNCTIONS
GALAXIES
MATTER
NONLUMINOUS MATTER
PARTICLES
PHYSICAL PROPERTIES
SCATTERING
SIMULATION
VELOCITY