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arXiv 2007.05341gr-qc
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Einstein四次引力场中黑洞的引力透镜

Gravitational Lensing by Black Holes in Einstein Quartic Gravity

H. Khodabakhshi, Robert B. Mann

摘要:

研究了Einstein四次引力场中球对称黑洞的引力透镜效应。利用连分式方法得到的近似解析解,我们考虑了EQG对银河系中心和其它地方的超大质量黑洞透镜效应的预言,并与广义相对论(GR)作了比较。我们数值计算图像的时间延迟和角位置,发现它们可以偏离GR多达毫弧秒,这表明EQG的观测测试是可行的,在不久的将来。我们讨论的挑战,区分EQG的预测从爱因斯坦立方引力。

英文摘要:

We investigate gravitational lensing effects of spherically symmetric black holes in Einstein Quartic Gravity (EQG). Using an approximate analytic solution obtained by continued fraction methods we consider the predictions of EQG for lensing effects by supermassive black holes at the center of our galaxy and others in comparison with general relativity (GR). We numerically compute both time delays and angular positions of images and find that they can deviate from GR by as much as milliarcseconds, suggesting that observational tests of EQG are feasible in the near future. We discuss the challenges of distinguishing the predictions of EQG from those of Einstein Cubic Gravity.

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