Discretising the velocity distribution for directional dark matter experiments
Discretising the velocity distribution for directional dark matter experiments
复制标题
离散定向暗物质实验的速度分布
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
B. Kavanagh
中科院分区：
文献类型：
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作者：
B. Kavanagh
暗物质直接探测实验具有方向敏感性，可能是探测银河系暗物质晕全速度分布函数的唯一方法。我们提出了一个角度的DM VDF的基础上，可用于参数化的分布，以减轻天体物理的不确定性，在未来的定向实验和提取信息的DM晕。该基础包括将VDF离散化在一系列角度仓中，其中VDF仅是每个仓内的DM速度v的函数。与其他方法（如球谐展开）相比，使用该基可以保证所得到的VDF处处为正，因此是物理的。我们提出了一个配方，用于计算对应于离散VDF为任意数量的角度箱N的事件率和调查的离散化误差，这是在这种方式引入。对于平滑的标准晕模型分布函数，仅需要N=3个角度箱来实现每个箱中事件数量的约01-30%的精度。在用大约50个事件确认信号的DM起源后不久，该精度应足以允许可靠地采用离散化速度分布。对于更极端的VDF（例如流），离散化误差通常要大得多，但可以随着N的增加而改善。这种方法为暗物质定向探测的独立于天体物理学的分析框架铺平了道路。
Dark matter (DM) direct detection experiments which are directionally-sensitive may be the only method of probing the full velocity distribution function (VDF) of the Galactic DM halo. We present an angular basis for the DM VDF which can be used to parametrise the distribution in order to mitigate astrophysical uncertainties in future directional experiments and extract information about the DM halo. This basis consists of discretising the VDF in a series of angular bins, with the VDF being only a function of the DM speed v within each bin. In contrast to other methods, such as spherical harmonic expansions, the use of this basis allows us to guarantee that the resulting VDF is everywhere positive and therefore physical. We present a recipe for calculating the event rates corresponding to the discrete VDF for an arbitrary number of angular bins N and investigate the discretisation error which is introduced in this way. For smooth, Standard Halo Model-like distribution functions, only N=3 angular bins are required to achieve an accuracy of around 01–30% in the number of events in each bin. Shortly after confirmation of the DM origin of the signal with around 50 events, this accuracy should be sufficient to allow the discretised velocity distribution to be employed reliably. For more extreme VDFs (such as streams), the discretisation error is typically much larger, but can be improved with increasing N. This method paves the way towards an astrophysics-independent analysis framework for the directional detection of dark matter.
改进了从直接检测数据中确定 WIMP 质量的方法
影响因子：
5
作者：
Kavanagh B
通讯作者：
Kavanagh B
通过直接检测实验独立于模型确定暗物质质量。
影响因子：
8.6
作者：
Kavanagh BJ
通讯作者：
Kavanagh BJ
影响因子：
5
作者：
Kavanagh B
通讯作者：
Kavanagh B