Accurate closed-form trajectories of light around a Kerr black hole using asymptotic approximants
Accurate closed-form trajectories of light around a Kerr black hole using asymptotic approximants
复制标题
使用渐近近似法计算克尔黑洞周围的精确封闭式光轨迹
DOI:
10.1088/1361-6382/aae0cd
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发表时间:
2018
影响因子:
3.5
通讯作者:
Barlow, Nathaniel S
中科院分区:
文献类型:
--
作者:
Beachley, Ryne J;Mistysyn, Morgan;Faber, Joshua A;Weinstein, Steven J;Barlow, Nathaniel S
Highly accurate closed-form expressions that describe the full trajectory of photons propagating in the equatorial plane of a Kerr black hole are obtained using asymptotic approximants. This work extends a prior study of the overall bending angle for photons (Barlow et al 2017 Class. Quantum Grav. 34 135017). The expressions obtained provide accurate trajectory predictions for arbitrary spin and impact parameters, and provide significant time advantages compared with numerical evaluation of the elliptic integrals that describe photon trajectories. To construct approximants, asymptotic expansions for photon deflection are required in various limits. To this end, complete expansions are derived for the azimuthal angle as a function of radial distance from the black hole in the far-distance and closest-approach (pericenter) limits, and new coefficients are reported for the bending angle in the weak-field limit (large impact parameter).
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DOI:
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