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arXiv · 0711.4895

The impact of going beyond the Maxwell distribution in direct dark matter detection rates

J. D. Vergados·S. H. Hansen·O. Host
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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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J. D. Vergados, S. H. Hansen, O. Host. 2007-11-30. The impact of going beyond the Maxwell distribution in direct dark matter detection rates. https://doi.org/10.1103/physrevd.77.023509

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