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arXiv 2009.07012gr-qcastro-ph.HEhep-th
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Kerr黑洞周围球形光子轨道的精确公式

Exact Formulas for Spherical Photon Orbits Around Kerr Black Holes

Aydin Tavlayan, Bayram Tekin

摘要:

到目前为止,只知道赤道轨道和极轨道的球形光子轨道半径与黑洞的旋转参数和轨道的有效倾角之间的精确公式。在这里,我们提供了精确的公式,非赤道轨道之间的这些极端的限制。对于给定的黑洞旋转参数,存在一个临界倾角,在该倾角以下有四个零光子轨道,其中两个在外部区域。在临界角,这些轨道的半径显式发现。我们还提供了近似的,但非常准确的公式,为任何轨道。为了得到这些解析解,我们仔细研究了零球面测地线半径上的六次多项式。

英文摘要:

Exact formulas relating the radii of the spherical photon orbits to the black hole's rotation parameter and the effective inclination angle of the orbit have been known only for equatorial and polar orbits up to now. Here we provide exact formulas for nonequatorial orbits that lie between these extreme limits. For a given rotation parameter of the black hole, there is a critical inclination angle below which there are four null photon orbits two of which are in the exterior region. At the critical angle, the radii of these orbits are explicitly found. We also provide approximate but very accurate formulas for any orbit. To arrive at these analytical solutions, we carefully study the sextic polynomial in the radius that arises for null spherical geodesics.

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