Stochastic fluctuations of bosonic dark matter.
Stochastic fluctuations of bosonic dark matter.
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玻色暗物质的随机涨落。
DOI：
10.1038/s41467-021-27632-7
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发表时间：
2021-12-16
影响因子：
16.6
通讯作者：
Derevianko A
中科院分区：
文献类型：
--
作者：
Centers GP;Blanchard JW;Conrad J;Figueroa NL;Garcon A;Gramolin AV;Kimball DFJ;Lawson M;Pelssers B;Smiga JA;Sushkov AO;Wickenbrock A;Budker D;Derevianko A
许多超出粒子物理标准模型的理论预言了可以构成暗物质的玻色子的存在。在银河系暗物质的标准晕模型中，玻色暗物质场的速度分布定义了一个特征相干时间τc。直到最近，寻找玻色暗物质场的实验室实验一直处于测量时间T显著超过τc的区域，因此假设玻色场振幅Φ0由局部平均暗物质密度固定来解释无效结果。在这里，我们表明，在T ≪ τc区工作的实验并没有采样玻色暗物质场振幅的全部分布，因此在推断约束时假定Φ0为固定值是不正确的。相反，为了解释实验室测量结果(即使是在发现的情况下)，有必要解释这种维尼化超轻场的随机性质。根据实验细节、模型假设和推理框架的选择，先前几个寻找超轻玻色暗物质的零实验所推断的约束被高估了3到10倍。直接暗物质搜索需要考虑总观测时间是否低于DM场的特征相干时间。在分析这一普遍被忽视的情景时，作者量化了维里化超光场的随机性质对Dm极限的影响。
Numerous theories extending beyond the standard model of particle physics predict the existence of bosons that could constitute dark matter. In the standard halo model of galactic dark matter, the velocity distribution of the bosonic dark matter field defines a characteristic coherence time τc. Until recently, laboratory experiments searching for bosonic dark matter fields have been in the regime where the measurement time T significantly exceeds τc, so null results have been interpreted by assuming a bosonic field amplitude Φ0 fixed by the average local dark matter density. Here we show that experiments operating in the T ≪ τc regime do not sample the full distribution of bosonic dark matter field amplitudes and therefore it is incorrect to assume a fixed value of Φ0 when inferring constraints. Instead, in order to interpret laboratory measurements (even in the event of a discovery), it is necessary to account for the stochastic nature of such a virialized ultralight field. The constraints inferred from several previous null experiments searching for ultralight bosonic dark matter were overestimated by factors ranging from 3 to 10 depending on experimental details, model assumptions, and choice of inference framework. Direct dark matter searches need to take into account whether the total observation time is lower than the characteristic coherence time of the DM field. Analysing this generally overlooked scenario, here the authors quantify the impact on DM limits of the stochastic nature of the virialised ultralight field.
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影响因子：
8.6
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通讯作者：
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