Dark Matter Substructure under the Electron Scattering Lamppost

Abstract

We study the mutual relationship between dark matter-electron scattering experiments and possible new dark matter substructure nearby hinted by the Gaia data. We show how kinematic substructure could affect the average and modulation spectra of dark matter-electron scattering in semiconductors, and the discovery reaches of future experiments with these targets. Conversely, we demonstrate how future data could probe and constrain the substructure dark matter fraction, even when it constitutes a sub-dominant component of the local dark matter density.

arXiv comment10 figures, 4 tables; comments welcome

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• Linear cosmological constraints on 2-body decaying dark matter scenarios and the $S_8$ tension
• Halo uncertainties in electron recoil events at direct detection experiments
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• Enhanced prospects for direct detection of inelastic dark matter from a non-galactic diffuse component
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• Information divergences to parametrize astrophysical uncertainties in dark matter direct detection