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arXiv 1806.08714hep-phastro-ph.CO
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包括天体物理学不确定性对局部暗物质搜索的影响

Bracketing the impact of astrophysical uncertainties on local dark matter searches

Alejandro Ibarra, Bradley J. Kavanagh, Andreas Rappelt

摘要:

太阳系内暗物质密度和速度分布的不确定性阻碍了对暗物质(DM)实验的理论解释。为了量化这些不确定性,我们提出了一个参数,其特征在于从标准的麦克斯韦-玻尔兹曼形式的真实速度分布的偏差,然后我们确定不同的值的这个参数的最积极的和最保守的限制上的暗物质散射截面与核的不确定性,在当地的暗物质密度可以占平凡。这使我们能够以一种独立于模型的方式,将天体物理学不确定性对直接探测实验和/或中微子望远镜极限的影响纳入其中。我们发现,目前的限制,假设标准晕模型是最多的一个因素$\sim 2$弱于最积极的可能的约束。此外,结合中微子望远镜和直接检测的限制(在统计上有意义的方式),我们表明,DM在质量范围$\sim 10 - 1000$ GeV的限制不能削弱超过10倍左右,所有可能的速度分布。最后,我们证明,我们的方法也可以采用DM发现的情况下,使我们能够避免偏见的DM属性的重建。

英文摘要:

The theoretical interpretation of dark matter (DM) experiments is hindered by uncertainties on the dark matter density and velocity distribution inside the Solar System. In order to quantify those uncertainties, we present a parameter that characterizes the deviation of the true velocity distribution from the standard Maxwell-Boltzmann form, and we then determine for different values of this parameter the most aggressive and most conservative limits on the dark matter scattering cross section with nuclei; uncertainties in the local dark matter density can be accounted for trivially. This allows us to bracket, in a model independent way, the impact of astrophysical uncertainties on limits from direct detection experiments and/or neutrino telescopes. We find that current limits assuming the Standard Halo Model are at most a factor of $\sim 2$ weaker than the most aggressive possible constraints. In addition, combining neutrino telescope and direct detection constraints (in a statistically meaningful way), we show that limits on DM in the mass range $\sim 10 - 1000$ GeV cannot be weakened by more than around a factor of 10, for all possible velocity distributions. We finally demonstrate that our approach can also be employed in the event of a DM discovery, allowing us to avoid bias in the reconstruction of the DM properties.

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