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

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

2007-11-30

arxiv.org/abs/0711.4895v1

Phys.Rev.D77:023509,2008

Astronomy and Astrophysics

Astrophysics

13 pages, 10 figures, accepted by Phys. Rev. D

Scientific paper

10.1103/PhysRevD.77.023509

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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