Astrophysical uncertainties in dark matter halo models produce O(1% to 100%) fractional deviations in predicted single-phonon rates, but can be captured by parameter variations within the Standard Halo Model after rms-matching.
The impact of going beyond the Maxwell distribution in direct dark matter detection rates
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abstract
We consider direct dark matter detection rates and investigate the difference between a standard Maxwell-Boltzmann velocity distribution and a "realistic" distribution like the ones extracted from numerical N-body simulations. Sizable differences are observed when such results are compared to the standard Maxwell-Boltzmann distribution. For a light target both the total rate and the annual modulation are reduced by ~25%. For a heavy target the total rate is virtually unchanged, whereas the annual modulation is modified by up to 50%, depending on the WIMP mass and detector energy threshold. We also consider the effect of a possible velocity anisotropy, and the effect is found to be largest for a light target For the realistic velocity distribution the anisotropy may reduce the annual modulation, in contrast to the Maxwell-Boltzmann case.
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2026 1verdicts
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Astrophysical Uncertainties in Sub-GeV Dark Matter Detection via Single Phonon Excitations
Astrophysical uncertainties in dark matter halo models produce O(1% to 100%) fractional deviations in predicted single-phonon rates, but can be captured by parameter variations within the Standard Halo Model after rms-matching.