Searching for low mass dark matter via phonon creation in superfluid He4
Searching for low mass dark matter via phonon creation in superfluid He4
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通过超流体 He4 中声子的产生寻找低质量暗物质
DOI：
10.1103/physrevd.102.035014
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发表时间：
2020
影响因子：
5
通讯作者：
Shelton, Jessie
中科院分区：
文献类型：
--
作者：
Baym, Gordon;Beck, D. H.;Filippini, Jeffrey P.;Pethick, C. J.;Shelton, Jessie
我们考虑暗物质粒子从超流液体，这已被提出作为其直接检测的目标的散射。下面我们将重点讨论暗物质的质量，从求和规则的论证中证明产生具有能量的单个声子的重要性。我们进一步证明了在低压下液体中声子的反常色散，其中声子动量和能量]具有重要的结果，即单个声子将在相对短的距离内衰减成以原始声子的方向为中心的较低能量声子簇。因此，在这一领域的实验挑战是检测一簇低能声子，而不仅仅是单个声子。在这样的簇射中，声子分布的额外信息可以增强暗物质质量的测定。
We consider the scattering of dark matter particles from superfluid liquid, which has been proposed as a target for their direct detection. Focusing on dark matter masses below, we demonstrate from sum-rule arguments the importance of the production of single phonons with energies. We show further that the anomalous dispersion of phonons in liquidat low pressures [i.e.,, whereandare the phonon momentum and energy] has the important consequence that a single phonon will decay over a relatively short distance into a shower of lower-energy phonons centered on the direction of the original phonon. Thus, the experimental challenge in this regime is to detect a shower of low-energy phonons, not just a single phonon. Additional information from the distribution of phonons in such a shower could enhance the determination of the dark matter mass.