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arXiv 2408.02729gr-qchep-th
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球对称时空中的引力诱导双折射

Gravity-induced birefringence in spherically symmetric spacetimes

Sebastian Murk, Daniel R. Terno, Rama Vadapalli

AI总结:

本文研究球对称时空中引力诱导的光线双折射现象,在频率领头阶计算了大质量天体对光偏折和发射的修正,并评估了其在天体物理观测中的可探测性。

摘要:

当波长远小于介质的特征长度尺度时,几何光学能够有效描述电磁波的传播,使得衍射等波动现象可以忽略不计。因此,真空中的光传播通常被建模为沿零测地线运动的光线。然而,广义相对论预言,在非均匀引力场中会出现依赖于偏振的偏离这些测地线的现象。本文中,我们计算了大质量引力体对光的偏折和发射的修正。此外,我们推导了表征轨迹的物理参数的标度行为。计算在频率的领头阶进行。我们利用这些结果评估了双折射效应在各种天体物理观测中的重要性。我们发现该效应无法用现有仪器测量,但在不久的将来可能可以被探测到。

英文摘要:

Geometric optics effectively describes the propagation of electromagnetic waves when the wavelength is much smaller than the characteristic length scale of the medium, making wave phenomena like diffraction negligible. As a result, light propagation in a vacuum is typically modeled by rays that follow null geodesics. However, general relativity predicts that polarization-dependent deviations from these geodesics occur in an inhomogeneous gravitational field. In this article, we evaluate the corrections for the deflection and emission of light by a massive gravitating body. Additionally, we derive the scaling behavior of the physical parameters characterizing the trajectories. The calculations are performed at leading order in frequency. We use these results to assess the significance of the birefringence effect in various astrophysical observations. We find that the effect cannot be measured with current instruments but may be detectable in the near future.

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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