Dark matter-electron scattering rates in isotropic materials are bounded from above by a universal expression depending only on plasma frequency, mass density, and static dielectric function.
Directional detection of dark matter streams
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abstract
Directional detection of WIMPs, in which the energies and directions of the recoiling nuclei are measured, currently presents the only prospect for probing the local velocity distribution of Galactic dark matter. We investigate the extent to which future directional detectors would be capable of probing dark matter substructure in the form of streams. We analyse the signal expected from a Sagittarius-like stream and also explore the full parameter space of stream speed, direction, dispersion and density. Using a combination of non-parametric directional statistics, a profile likelihood ratio test and Bayesian parameter inference we find that within acceptable exposure times (O(10) kg yr for cross sections just below the current exclusion limits) future directional detectors will be sensitive to a wide range of stream velocities and densities. We also examine and discuss the importance of the energy window of the detector.
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First-principles upper bounds on dark matter-electron scattering rates from condensed matter sum rules
Dark matter-electron scattering rates in isotropic materials are bounded from above by a universal expression depending only on plasma frequency, mass density, and static dielectric function.