Solar neutrino physics with low-threshold dark matter detectors
  Dark matter detectors will soon be sensitive to Solar neutrinos via two
distinct channels: coherent neutrino-nucleus scattering and neutrino electron
elastic scattering. We establish an analysis method for extracting Solar model
properties and neutrino properties from these measurements, including the
possible effects of sterile neutrinos which have been hinted at by some reactor
experiments and cosmological measurements. Even including sterile neutrinos,
through the coherent scattering channel a 1 ton-year exposure with a
low-threshold Germanium detector could improve on the current measurement of
the normalization of the $^8$B Solar neutrino flux down to 3% or less.
Combining with the elastic scattering data will provide constraints on both the
high and low energy survival probability, and will improve on the uncertainty
on the active-to-sterile mixing angle by a factor of two. This sensitivity to
active-to-sterile transitions is competitive and complementary to forthcoming
dedicated short baseline sterile neutrino searches with nuclear decays.
