Direct detection of dark matter bound to the Earth

Riccardo Catena, Chris Kouvaris

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Abstrakt

We study the properties and direct detection prospects of an as of yet neglected population of dark matter (DM) particles moving in orbits gravitationally bound to the Earth. This DM population is expected to form via scattering by nuclei in the Earth's interior. We compute fluxes and nuclear recoil energy spectra expected at direct detection experiments for the new DM population considering detectors with and without directional sensitivity, and different types of target materials and DM-nucleon interactions. DM particles bound to the Earth manifest as a prominent rise in the low-energy part of the observed nuclear recoil energy spectrum. Ultra-low threshold energies of about 1 eV are needed to resolve this effect. Its shape is independent of the DM-nucleus scattering cross-section normalization.

OriginalsprogEngelsk
Artikelnummer063012
TidsskriftPhysical Review D
Vol/bind96
Udgave nummer6
Antal sider15
ISSN2470-0010
DOI
StatusUdgivet - 2017

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