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arXiv 2108.09409gr-qcastro-ph.HEhep-th
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用附加项修正的黑洞度规研究强引力透镜

Investigating strong gravitational lensing with black hole metrics modified with an additional term

Xiao-Jun Gao, Ji-Ming Chen, Hongsheng Zhang, Yihao Yin, Ya-Peng Hu

摘要:

引力透镜是最令人印象深刻的天体现象之一,它在强场极限下有着有趣的行为。在这个极限附近,Bozza发现光的偏转角可以用对数项和常数项很好地近似。用这种方法,他明确地导出了几种类型的黑洞的偏转角的解析表达式。本文研究了两类新的度量在强场极限下的显式计算:(i)在度量函数中增加$r^{-n}(n\geq 3)$项的Schwarzschild度量和(ii)在度量函数中增加$r^{-6}$项的Reissner-Nordstrom度量.有了这种类型的指标,Bozza的原始方式选择的集成变量可能会导致技术上的困难,明确表示的偏转角,我们使用一个稍微修改的版本Bozza的方法来规避这个问题。

英文摘要:

Gravitational lensing is one of the most impressive celestial phenomena, which has interesting behaviors in its strong field limit. Near such limit, Bozza finds that the deflection angle of light is well-approximated by a logarithmic term and a constant term. In this way he explicitly derived the analytic expressions of deflection angles for a few types of black holes. In this paper, we study the explicit calculation to two new types of metrics in the strong field limit: (i) the Schwarzschild metric extended with an additional $r^{-n}(n\geq 3)$ term in the metric function; (ii) the Reissner-Nordstrom metric extended with an additional $r^{-6}$ term in the metric function. With such types of metrics, Bozza's original way of choosing integration variables may lead to technical difficulties in explicitly expressing the deflection angles, and we use a slightly modified version of Bozza's method to circumvent the problem.

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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