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arXiv 2603.26346gr-qcastro-ph.HEhep-th
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环形轨道在球对称时空中的研究及BSW效应与非零力

Circular orbits in spherically symmetric spacetimes and BSW effect with nonzero force

V.N.Karazin Kharkov National University(哈尔科夫国立大学);Charles University(查理大学);Kharkov V.N. Karazin National University(哈尔科夫 V.N. 卡拉金国立大学)

Hryhorii Ovcharenko, O. B. Zaslavskii

AI总结:

本文研究了在非零外力作用下环形粒子运动的稳定性及ISCO定义扩展,分析了极端黑洞和超极端黑洞的加速度特性,并探讨了高能粒子碰撞的依赖关系。

摘要:

我们考虑在静态球对称时空中的粒子在任意外力作用下的环形运动。我们推导出寻找作用在环形粒子上的力的工具,并推断其位置是否稳定。这还允许将ISCO的定义扩展到非零外力的情况。通过近视界展开,我们发现对于非极值黑洞,极值黑洞的加速度是有限的,而对于超极值(多重)视界,加速度趋于零。将推导的工具应用于Schwarzschild度规,假设力为常数,研究了给定力下的轨道数与其值的关系。特别地,当力足够大时,会出现额外的解分支,这在测地运动中不存在。然后,对于各种环形轨道,我们数值研究了其稳定性。类似的问题也解决了Reissner-Nordstrom(RN)度规和未带电粒子的情况。发现对于近极值和极值RN黑洞,存在近视界圆轨道(与非极值情况不同)。对于ISCO,轨道半径对κ(表面引力)的依赖类似于中性粒子在旋转黑洞背景中的情况。此外,还考虑了高能粒子碰撞的两种场景,并发现其对κ的依赖也类似于旋转黑洞。

英文摘要:

We consider circular particle motion under the action of an unspecified force in a static spherically symmetric spacetime. We derive the machinery that allows one to find the force acting on a circular particle and deduce whether its position is stable or not. This also allows one to extend the definition of ISCO to the case of a non-zero external force. By conducting the near-horizon expansion, we obtain that for any non-extremal black holes, the acceleration for extremal ones is finite, and for ultraextremal (multiple) horizons it tends to zero. Applying the derived machinery to the case of the Schwarzschild metric assuming that a force is constant, we scrutiny how the number of orbits for a given force depends on its value. In particular, if a force is big enough, an additional branch of solutions appears that was absent in the case of geodesic motion. Then, for various circular orbits, we numerically investigate their stability. A similar problem is solved for the Reissner-Nordstrom (RN) metric and uncharged particles. It appears that for the near-extremal and extremal RN black holes, there exist near-horizon circle trajectories (in contrast to the nonextremal case). For the ISCO, the dependence of the orbit radius on $κ$ (the surface gravity) is similar to that in the case of neutral particles moving in the background of rotating black holes. In addition, two scenarios of high-energy particle collisions near such orbits are considered, and it is found that dependence on $κ$ is also similar to that for rotating black holes.

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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