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The rate of dark matter-electron scattering depends on the underlyingvelocity distribution of the dark matter halo. Importantly, darkmatter-electron scattering is particularly sensitive to the high-velocity tail,which differs significantly amongst the various dark matter halo models. Inthis work, we summarize the leading halo models and discuss the variousparameters which enter them. We recommend updated values for these parametersbased on recent studies and measurements. Furthermore, we quantify thedependence of the dark matter-electron scattering rate on the choice of halomodel and parameters, and demonstrate how these choices propagate to thepredicted cross-section limits. The rate is most sensitive to changes in thecircular velocity v0; in silicon targets, we find that the changes in the ratepredictions can range from O(0.01%) to O(100%) for contact interactions andO(10%) to O(100%) for long-range interactions.

Dependence of Dark Matter - Electron Scattering on the Galactic Dark Matter Velocity Distribution