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arXiv 2406.02697gr-qc
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关于Kerr-Newman奇点周围闭合类时曲线与禁闭结构的作用

On the role of closed timelike curves and confinement structure around Kerr-Newman singularity

Ayanendu Dutta, Dhritimalya Roy, Subenoy Chakraborty

AI总结:

本研究探究Kerr-Newman时空裸奇点与黑洞周围粒子运动及闭合类时曲线,发现不同电荷粒子穿越规则有别,且测试粒子被禁闭在距奇点一定距离外,还给出了空表面半径的精确表达式。

摘要:

本研究探究了Kerr-Newman时空的裸奇点与黑洞周围的粒子运动,重点关注闭合类时轨道。研究发现,无论是在裸奇点(NS)还是黑洞(BH)中,奇点都被因果违背区域遮蔽,且在非极端黑洞中,柯西面始终位于内视界内部。对于中性粒子以及与源带同种电荷的粒子,仅具有正角动量的粒子被允许穿越闭合类时曲线。相反,对于与源带异种电荷的粒子,强库仑引力会将所有粒子吸入柯西面内部,使其无论角动量如何都能存在于闭合类时曲线中。然而,在NS和BH(包括极端与非极端情况)中,测试粒子都被禁闭在距奇点相当远的位置,因此奇点周围始终存在一个空区域,阻止粒子与奇点发生相互作用。本研究还探究了依赖于源参数与粒子特性的空表面半径,并给出了精确表达式。

英文摘要:

In this study, the particle motion around the naked singularity and black hole of Kerr-Newman spacetime is investigated with a special attention on the closed timelike orbits. It is found that both in the naked singularity (NS) and in black hole (BH), the singularity is concealed by causality violating regions, and the Cauchy surface consistently resides inside the inner horizon in non-extremal black holes. For neutral particles and particles with an identical charge to the source, only particles with positive angular momentum are permitted to traverse the closed timelike curves. Conversely, for particles with the opposite charge to the source, the strong Coulomb attraction draws all particles inside the Cauchy surface, allowing them to be present in the closed timelike curves irrespective of their angular momentum. However, in both the NS and BH (both extremal and non-extremal), test particles are confined at a considerable distance from the singular point such that there always exists an empty region surrounding the singularity which prevents particles from interacting with it. The radius of the empty surface that depends on the source parameters and the particle characteristics, is investigated with an accurate expression.

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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