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arXiv 2212.03020hep-phastro-ph.COgr-qchep-th
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通过黑洞的光子环变暗观测轴子

Observing axions through photon ring dimming of black holes

Kimihiro Nomura, Kaishu Saito, Jiro Soda

备注：
18 pages, 4 figures
发表信息：
Phys. Rev. D 107, 123505 (2023)
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AI总结：

本研究利用黑洞附近磁场及光子绕黑洞运行的特性，提出通过黑洞光子环因光子转轴子产生的变暗现象探测轴子，证实超大质量黑洞中该效应可高效发生，最大变暗率25%，为轴子探测提供新手段。

摘要：

众所周知，黑洞附近存在磁场，且光子可因强引力围绕黑洞运行。利用这些事实，我们可以探测假想的赝标量粒子，即轴子（axions）。实际上，光子在磁场中传播时可转化为轴子。这类光子向轴子的转化会导致黑洞阴影周围的光子环变暗。我们证明，对于超大质量黑洞，光子环变暗可高效发生。值得注意的是，光子环的最大变暗率为25%。以M87*为例，若能达到10^-5角秒的角分辨率，在X射线和伽马射线波段将观测到10%的变暗程度。变暗的频段和幅度取决于轴子-光子耦合常数和轴子质量。因此，光子环的畸变光谱为探测轴子提供了一种新工具。

英文摘要：

It is known that magnetic fields exist near black holes and photons can go around black holes due to strong gravity. Utilizing these facts, we can probe hypothetical pseudoscalar particles, so-called axions. In fact, photons can be converted into axions when they propagate in a magnetic field. The conversion of such photons into axions leads to a dimming of the photon ring around the black hole shadow. We show that photon ring dimming can occur efficiently for supermassive black holes. Remarkably, it turns out that the maximal dimming rate of the photon ring is 25%. In the case of M87*, the dimming of 10% will be observed in the X-ray and gamma-ray bands if the angular resolution of $10^{-5}$ arcsec is achieved. The frequency band and the magnitude of the dimming depend on the axion-photon coupling and axion mass. Hence, the distorted spectrum of the photon ring provides a novel tool for detecting axions.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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