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We study the implications of a pseudo-phase-space density power-law for theanisotropy profile of a Milky Way-like dark matter halo. Requiring that theanisotropy parameter does not take non-physical values within the virial radiusplaces a maximum value on the local radial velocity dispersion. For a plausiblerange of halo parameters, it is possible to take a local total velocitydispersion of up to about $300\,\mathrm{km/s}$. Making this choice uniquelyspecifies the anisotropy and dispersion profiles. We introduce a way to modelthe local velocity distribution that incorporates this anisotropy and study theimpact on direct detection.

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