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arXiv 2607.04550astro-ph.COastro-ph.SRhep-ph
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作为轴子暗物质双折射探测器的密近双星的反射偏振

Reflection polarization of close binaries as a probe of axion dark matter birefringence

The University of Tokyo(东京大学);National Chung Hsing University(国立中兴大学);Kyoto University(京都大学)

Tomoki Matsuoka, Kimihiro Nomura, Hidetoshi Omiya

AI总结:

提出用密近双星偏振测量探测超轻轴子暗物质引起的双折射,利用反射或散射产生的锁相线性偏振搜索轴子引起的偏振角振荡旋转,估算了单颗亮双星的灵敏度及未来阵列的潜力。

摘要:

我们提出密近双星偏振测量作为由超轻轴子暗物质引起的双折射的探测器。在密近双星中,反射或散射可产生小的线性偏振,其时间依赖性与轨道相位锁定。这种锁相偏振提供了一个模板,可据此搜索由轴子引起的偏振角的振荡旋转。我们表明轴子双折射表现为轨道谐波周围的边带。对于一颗由观测系统和当前高精度光学偏振测量激发参数的亮双星,我们估计在白噪声假设下,对于轴子质量为10^-20 eV时,对轴子-光子耦合的灵敏度为10^-12 GeV^-1水平。在乐观情况下,未来合适双星阵列可将灵敏度进一步提高到10^-13 GeV^-1。与现有天体物理搜索相比,该方法可为轴子双折射提供一种互补的高 cadence 光学探测。

英文摘要:

We propose close binary polarimetry as a probe of birefringence induced by ultralight axion dark matter. In a close binary, reflection or scattering can generate a small linear polarization whose time dependence is locked to the orbital phase. This phase-locked polarization provides a template against which an oscillatory rotation of the polarization angle induced by the axion can be searched for. We show that axion birefringence appears as sidebands around the orbital harmonics. For a single bright binary, with parameters motivated by observed systems and current high-precision optical polarimetry, we estimate the sensitivity to the axion-photon coupling under white noise assumption to be the level of $10^{-12}$ GeV$^{-1}$ at an axion mass of $10^{-20}$ eV. A future array of suitable binaries could further improve the sensitivity to $10^{-13}$ GeV$^{-1}$ in an optimistic scenario. This method could provide a complementary high-cadence optical probe of axion birefringence, compared to existing astrophysical searches.

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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