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arXiv 1009.0916astro-ph.COastro-ph.GAhep-ph
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直接探测信号对WIMP速度分布的依赖性

Dependence of direct detection signals on the WIMP velocity distribution

Anne M. Green

摘要:

在WIMP直接探测实验中预期的信号依赖于超局域暗物质分布。观测探测局部密度,圆周速度和逃逸速度,而模拟发现速度分布显着偏离标准麦克斯韦分布。我们计算的能量,时间和方向的依赖性事件率的范围内的速度分布的动机最近的观测和模拟,也调查的不确定性,在确定的WIMP参数。主要的不确定性是局部圆周速度中的系统误差以及MW是否具有高密度暗盘。在这两种情况下,有实质性的变化,平均差分事件率和年度调制信号,因此排除限制和确定的WIMP质量。晕速度分布形状的不确定性不太重要,但它会导致WIMP质量的5%系统误差。详细的事件率的方向依赖性是敏感的速度分布。然而,检测各向异性和确认中位反冲方向所需的事件数量基本上没有变化。

英文摘要:

The signals expected in WIMP direct detection experiments depend on the ultra-local dark matter distribution. Observations probe the local density, circular speed and escape speed, while simulations find velocity distributions that deviate significantly from the standard Maxwellian distribution. We calculate the energy, time and direction dependence of the event rate for a range of velocity distributions motivated by recent observations and simulations, and also investigate the uncertainty in the determination of WIMP parameters. The dominant uncertainties are the systematic error in the local circular speed and whether or not the MW has a high density dark disc. In both cases there are substantial changes in the mean differential event rate and the annual modulation signal, and hence exclusion limits and determinations of the WIMP mass. The uncertainty in the shape of the halo velocity distribution is less important, however it leads to a 5% systematic error in the WIMP mass. The detailed direction dependence of the event rate is sensitive to the velocity distribution. However the numbers of events required to detect anisotropy and confirm the median recoil direction do not change substantially.

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