Effect of gravitational focusing on annual modulation in dark-matter direct-detection experiments.
Effect of gravitational focusing on annual modulation in dark-matter direct-detection experiments.
复制标题
引力聚焦对暗物质直接探测实验中年调制的影响。
DOI：
10.1103/physrevlett.112.011301
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发表时间：
2013
影响因子：
8.6
通讯作者：
B. Safdi
中科院分区：
文献类型：
--
作者：
Samuel C. K. Lee;M. Lisanti;A. Peter;B. Safdi
由于地球绕太阳运行，暗物质直接探测实验的散射率应该每年都有所调整。这种速度通常被认为在6月1日左右达到极限，那时地球相对于暗物质风的相对速度是最大的。我们指出，引力聚焦可以改变这种调制相位。未绑定的暗物质粒子被太阳的引力势聚焦，影响了它们在实验室框架中的相空间密度。引力聚焦可以导致年调制阶段的显著整体偏移，这与低散射速度的暗物质最为相关。光O(10) GeV暗物质的诱导相移也可能是显著的，这取决于实验的阈值能量。
The scattering rate in dark-matter direct-detection experiments should modulate annually due to Earth's orbit around the Sun. The rate is typically thought to be extremized around June 1, when the relative velocity of Earth with respect to the dark-matter wind is maximal. We point out that gravitational focusing can alter this modulation phase. Unbound dark-matter particles are focused by the Sun's gravitational potential, affecting their phase-space density in the lab frame. Gravitational focusing can result in a significant overall shift in the annual-modulation phase, which is most relevant for dark matter with low scattering speeds. The induced phase shift for light O(10) GeV dark matter may also be significant, depending on the threshold energy of the experiment.