Derivation of the anisotropy profile, constraints on the local velocity dispersion, and implications for direct detection

Journal Article · Sat Feb 01 00:00:00 EST 2014 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2014/02/023· OSTI ID:22369761

Hunter, Daniel R., E-mail: [e-mail] ^[1]

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1. Physics Department and The McDonnell Center for the Space Sciences, Washington University, St. Louis, MO, 63130 (United States)

We study the implications of a pseudo-phase-space density power-law for the anisotropy profile of a Milky Way-like dark matter halo. Requiring that the anisotropy parameter does not take non-physical values within the virial radius places a maximum value on the local radial velocity dispersion. For a plausible range of halo parameters, it is possible to take a local total velocity dispersion of up to about 300 km/s. Making this choice uniquely specifies the anisotropy and dispersion profiles. We introduce a way to model the local velocity distribution that incorporates this anisotropy and study the impact on direct detection.

• OSTI ID: 22369761
• Journal Information: Journal of Cosmology and Astroparticle Physics, Vol. 2014, Issue 02; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1475-7516
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
ANISOTROPY
DISTRIBUTION
LIMITING VALUES
MILKY WAY
NONLUMINOUS MATTER
POWER DENSITY
RADIAL VELOCITY