引力场中宇称不守恒的证据
Evidence for parity violation in gravitational fields
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中文总结 AI 辅助
该研究分析HERA康普顿偏振仪的314896个能谱，发现引力场中存在宇称不守恒的迹象，测量到康普顿边缘能量不对称性，其结果或可区分引力宇称不守恒与暗物质理论。
中文摘要 AI 辅助
引力中的离散对称性仅在低能非相对论物质中接受过测试，证实了完美对称的广义相对论。最近在HERA康普顿偏振仪用电子和正电子束测量的两个能谱中，发现了引力场中高能$\boldsymbol{\textit{CP}}$不守恒的迹象。本文报告对同一偏振仪2004至2007年期间获取的314896个能谱的分析结果，这些能谱由激光偏振态标记，可分离电荷（$\boldsymbol{\textit{C}}$）和空间宇称（$\boldsymbol{\textit{P}}$）的贡献。由激光螺旋度翻转诱导的测量康普顿边缘能量不对称性高达$(4.9\boldsymbol{\times}0.5)\boldsymbol{\times}10^{-5}$，对应引力势中与螺旋度相关的差值为$(1.7\boldsymbol{\times}0.2)\boldsymbol{\times}10^{-14}$。若观测到的反常耦合具有能量无关性，自旋不对称引力将对星系旋转曲线产生贡献。进一步分析和计算可确定观测到的引力宇称不守恒幅度是否足以将这一著名现象与暗物质理论区分开。
英文摘要
Discrete symmetries in gravity have only been tested for low energy, non-relativistic matter, confirming the perfectly symmetric general relativity. A hint for high energy $\cal{CP}$ violation in gravitational fields has recently been found in the HERA Compton polarimeter's two spectra, measured with electron and positron beams. Here we report results of the analysis of the same polarimeter's 314896 spectra, acquired during 2004--2007 and tagged by laser polarization states allowing the separation of charge ($\cal C$) and space parity ($\cal P$) contributions. The measured Compton edge energy asymmetry, induced by the laser helicity flips, is as high as $(4.9\pm0.5)\cdot10^{-5}$ which corresponds to a helicity-dependent difference in the gravitational potentials of $(1.7\pm0.2)\cdot10^{-14}$. In the case of the observed anomalous coupling's energy independence, the spin asymmetric gravity will contribute to the galactic rotational curves. Further analysis and calculations can determine whether the observed magnitude of the gravitational parity violation is sufficient for detaching this famous phenomena from the dark matter theory.
