黑洞反弹-克尔-纽曼时空中自旋粒子的混沌界破坏中的视界-轨道尺度竞争
Horizon--orbit scale competition underlying chaos bound violation for spinning particles
- School of Science, Xihua University（西华大学理学院）
- Center for Gravitational Wave Experiment, National Microgravity Laboratory, Institute of Mechanics, Chinese Academy of Sciences（中国科学院力学研究所微重力实验室引力波实验中心）
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中文总结 AI 辅助
本文研究黑洞反弹-克尔-纽曼时空中自旋带电粒子的混沌界破坏，揭示其由视界-轨道尺度竞争控制，并发现总角动量主导局部径向不稳定性。
中文摘要 AI 辅助
本文研究了黑洞反弹-克尔-纽曼时空中带电自旋测试粒子在非稳定圆轨道上的局部径向不稳定性，并探讨了混沌界。我们的结果表明，混沌界的破坏由局部轨道不稳定性尺度与表面引力尺度之间的竞争所控制，黑洞背景的变化和粒子动力学的变化为达到同一阈值穿越提供了两条互补的路径。背景变化同时影响两个尺度，当表面引力比轨道不稳定性受到更强的抑制时，系统可进入混沌界破坏区域。相比之下，在固定背景下，表面引力保持不变，而穿越阈值的转变由粒子参数引起的非稳定轨道动力学变化所驱动。因此，背景控制和探针动力学控制的路径代表了统一的视界-轨道尺度竞争的两种实现，而非独立的机制。在所考虑的粒子参数中，总角动量在控制局部径向不稳定性方面起主导作用，而自旋和电荷进一步改变不稳定性强度并移动混沌界破坏的阈值。
英文摘要
In this paper, we investigate the chaos bound through the local radial instability of charged spinning test particles on unstable circular orbits in the black-bounce--Kerr--Newman spacetime. Our results show that violation of the bound is governed by the competition between the local orbital-instability scale and the surface gravity scale, with variations of the black hole background and the particle dynamics providing two complementary routes to the same threshold crossing. Background variations affect both scales and can drive the system into the bound-violating regime when the surface gravity is suppressed more strongly than the orbital instability. At fixed background, by contrast, the surface gravity remains unchanged, and the transition across the threshold is driven by changes in the unstable orbit dynamics induced by the particle parameters. The background-controlled and probe-dynamics-controlled routes therefore represent two realizations of a unified horizon--orbit scale competition rather than independent mechanisms.
