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arXiv 1612.04044gr-qcastro-ph.CO
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在强偏转极限下对光的引力弯曲角的远距离修正

Finite-distance corrections to the gravitational bending angle of light in the strong deflection limit

Asahi Ishihara, Yusuke Suzuki, Toshiaki Ono, Hideki Asada

摘要:

在早期出版物[Ishihara,Suzuki,Ono,Kitamura,Asada,Phys. Rev. D { \bf 94},084015(2016)]中开始的继续工作中,我们讨论了一种计算静态、球对称和渐近平坦时空中光的弯曲角的方法,特别是通过考虑从透镜对象到光源和接收器的有限距离。为此,我们使用高斯-博内定理来定义光的弯曲角,使得该定义在强偏转极限下也有效。最后,这种方法被应用到史瓦西时空,以讨论可能的观测影响。例如,对Sgr A $^{\ast}$提出的修正在某些参数范围内能够达到$\sim 10^{-5}$角秒,这可能在不久的将来天文学的能力范围内,而在弱场极限下对太阳的修正也是$\sim 10^{-5}$角秒。

英文摘要:

Continuing work initiated in an earlier publication [Ishihara, Suzuki, Ono, Kitamura, Asada, Phys. Rev. D {\bf 94}, 084015 (2016) ], we discuss a method of calculating the bending angle of light in a static, spherically symmetric and asymptotically flat spacetime, especially by taking account of the finite distance from a lens object to a light source and a receiver. For this purpose, we use the Gauss-Bonnet theorem to define the bending angle of light, such that the definition can be valid also in the strong deflection limit. Finally, this method is applied to Schwarzschild spacetime in order to discuss also possible observational implications. The proposed corrections for Sgr A$^{\ast}$ for instance are able to amount to $\sim 10^{-5}$ arcseconds for some parameter range, which may be within the capability of near-future astronomy, while also the correction for the Sun in the weak field limit is $\sim 10^{-5}$ arcseconds.

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