Is a co-rotating Dark Disk a threat to Dark Matter Directional Detection ?

Abstract

Recent N-Body simulations are in favor of the presence of a co-rotating Dark Disk that might contribute significantly (10%-50%) to the local Dark Matter density. Such substructure could have dramatic effect on directional detection. Indeed, in the case of a null lag velocity, one expects an isotropic WIMP velocity distribution arising from the Dark Disk contribution, which might weaken the strong angular signature expected in directional detection. For a wide range of Dark Disk parameters, we evaluate in this Letter the effect of such dark component on the discovery potential of upcoming directional detectors. As a conclusion of our study, using only the angular distribution of nuclear recoils, we show that Dark Disk models as suggested by recent N-Body simulations will not affect significantly the Dark Matter reach of directional detection, even in extreme configurations.

17 pages, 7 figures

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• Reconstructing the three-dimensional local dark matter velocity distribution
• Time-integrated directional detection of dark matter
• Informing dark matter direct detection limits with the ARTEMIS simulations
• Graphene-based detectors for directional dark matter detection
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• Discretising the velocity distribution for directional dark matter experiments
• The Dynamical Response of Dark Matter to Galaxy Evolution Affects Direct-Detection Experiments
• A review on the discovery reach of Dark Matter directional detection
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• Measurement of the electron drift velocity for directional dark matter detectors