Directional detection of dark matter streams

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.

18 pages, 12 figures, 1st revision, submitted to Phys. Rev. D

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Cited by in corpus (17)

• A Tail of Two Populations: Chemo-dynamics of the Sagittarius Stream and Implications for its Original Mass
• Readout technologies for directional WIMP Dark Matter detection
• Axion astronomy with microwave cavity experiments
• Nuclear spin-dependent interactions: Searches for WIMP, Axion and Topological Defect Dark Matter, and Tests of Fundamental Symmetries
• Dark Matter vs. Neutrinos: The effect of astrophysical uncertainties and timing information on the neutrino floor
• Reconstructing the three-dimensional local dark matter velocity distribution
• Time-integrated directional detection of dark matter
• Gravitational focusing effects on streaming dark matter as a new detection concept
• Axion minicluster streams in the solar neighbourhood
• Discretising the velocity distribution for directional dark matter experiments
• The Dynamical Response of Dark Matter to Galaxy Evolution Affects Direct-Detection Experiments
• Comparing readout strategies to directly detect dark matter
• Particle detection and tracking with DNA
• Search for axions in streaming dark matter
• Directional direct detection of light dark matter up-scattered by cosmic rays from direction of the Galactic center
• Directional Direct Detection of MeV Scale Boosted Dark Matter in Two Component Dark Matter Scenario via Dark Photon Interaction
• Some Thoughts on (the Incompleteness of) the (Double) Differential Event Rates for Elastic WIMP-Nucleus Scattering in (Directional) Direct Dark Matter Detection Physics