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arXiv 1703.07510gr-qc
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Kerr-Sen黑洞周围的测地线和观测量

Null Geodesics and Observables around Kerr-Sen Black Hole

Rashmi Uniyal, Hemwati Nandan K. D. Purohit

摘要:

本文研究了在杂化弦论中产生的Kerr-Sen黑洞背景下的测地线运动。讨论了径向和纬向有效势的性质。得到了一类特殊的球形光子轨道,并给出了径向光子的转向点表达式。考虑到不同的黑洞参数,讨论了这类解中光子运动的依赖性。本文考虑了光子的非赤道运动,以更一般的方式讨论了无质量试验粒子绕Kerr-Sen黑洞作测地线运动的允许区域。不同类型的可能轨道的条件进行了讨论与具体的参数值以及相应的轨道结构。由于非零黑洞电荷,光子不可能有终止轨道。角平面上的观测(即弯曲的光和近日点进动的大规模测试粒子)作为特殊情况进行分析。我们还计算了Kerr-Sen黑洞的旋转和质量参数,这些参数是由代表恒星或其他可能的光子源的大质量测试粒子发射的光子在圆形和赤道轨道上的红/蓝移计算的。

英文摘要:

We investigate the geodesic motion in the background of Kerr-Sen Black Hole arising in the heterotic string theory. The nature of effective potential is discussed in radial as well as latitudinal direction. A special class of spherical photon orbits is obtained along with the expression for the turning point for radial photons. Dependence of photon motion within this class of solution is discussed explicitly in view of the different Black Hole parameters. We have discussed the allowed regions for geodesic motion of massless test particles around Kerr- Sen Black Hole in more generalised way by including non-equatorial motion of the photons into the account. The conditions for different types of possible orbits are discussed with specific parameter values along with the corresponding orbit structure. No terminating orbits are possible for photons due to non-zero Black Hole charge. Observables on the angular plane (viz. bending of light and perihelion precession for massive test particles) are analysed as special cases. We have also calculated the rotation and mass parameters for Kerr-Sen Black Hole in terms of the red/blue shifts of the photons in circular and equatorial orbits emitted by the massive test particles which represent stars or other probable sources of photons.

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