利用基于同步辐射的穆斯堡尔谱学探测（超）轻暗物质
Probing (Ultra-) Light Dark Matter Using Synchrotron Based Mössbauer Spectroscopy
AI总结：
本文提出用同步辐射穆斯堡尔谱学探测（超）轻标量暗物质，通过长基线源-吸收体间核跃迁能量调制检验暗物质引起的基本常数变化，可将暗物质搜寻拓展至MHz频段并超越等效原理限制数个数量级。
摘要：
我们提出利用基于同步辐射的穆斯堡尔谱学技术搜寻（超）轻标量暗物质（DM）。此类暗物质会引起各种基本常数的随时间变化，进而导致核跃迁能量的时间调制。当穆斯堡尔源与吸收体之间相隔较长基线时，暗物质引起的两者能级之间的偏移可以通过光子吸收谱的调制来检验。狭窄的穆斯堡尔跃迁使得该装置能够高效地探测高频范围内的暗物质。我们表明，利用现有同步辐射束流的穆斯堡尔实验的探测能力与各种等效原理破坏搜寻所给出的限制相当。对同步辐射装置的改进将使我们能够探测迄今尚未探索的暗物质参数空间区域，最高可达 MHz 频率。所提出的方法将把暗物质搜寻扩展到超出等效原理（EP）限制数个数量级，并将在高（>kHz）频区域对暗物质与各种标准模型场的相互作用强度提供最佳限制。
英文摘要：
We propose to search for (ultra)-light scalar dark matter (DM) using synchrotron radiation based Mössbauer spectroscopy technique. Such DM induces temporal variation in various fundamental constants, which in turn causes time modulation of the nuclear transition energies. When a Mössbauer source and absorber is separated by a large baseline, the DM induced shift between their energy levels can be tested by the modulation of the photon absorption spectrum. The narrow Mössbauer transitions allow the setup to efficiently probe DM in the high frequency range. We show that the reach of a Mössbauer experiment with the existing synchrotron beams is at par with the bounds from various equivalence principle violation searches. An improvement of the synchrotron setup would enable us to probe the hitherto uncharted territory of the DM parameter space upto MHz frequency. The proposed method would extend the DM search beyond the EP limit by several orders of magnitude, and would provide the best bound on DM interaction strength with various standard model fields in the high ($>$kHz) frequency region.
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