标题： 圆周运动和带电弦黑洞时空的约束 显示英文标题

标题： Epicyclic motions and constraints on the charged stringy black hole spacetime

摘要： 本文的目的是研究带电粒子在磁荷弦黑洞附近在电磁场作用下的圆周运动。 这项研究受到一个已知事实的激励，即磁场对黑洞附近的带电粒子运动有显著影响。 已经观察到，磁耦合参数对磁单极电荷的运动有类似的影响，导致最内稳定圆轨道（ISCO）的半径增加或减少，这在设定吸积盘内边缘中起着关键作用。 此外，我们分析了圆周运动的特性，并确定了圆周频率的一般形式。 我们的结果表明，磁耦合参数的存在可以解释从三个特定微类星体观测到的高频QPO的共振现象。 我们使用蒙特卡洛模拟，结合三个选定微类星体的观测频率，来限制磁荷弦黑洞的参数以及描述粒子与黑洞相互作用的耦合参数。 最后，我们详细研究了黑洞附近吸积盘的辐射特性。 我们表明，磁耦合参数可以显著影响吸积盘的辐射通量。 显示英文摘要

摘要： The purpose of this paper is to examine the epicyclic motion of charged particles in the vicinity of a magnetically charged stringy black hole subject to an electromagnetic field. This investigation is motivated by the established fact that magnetic fields have a significant impact on the motion of charged particles in the vicinity of a black hole. It has been observed that the magnetic coupling parameter has a comparable impact on the motion of magnetic monopole charge, leading to an increase/decrease in the radius of the innermost stable circular orbit (ISCO) that plays a crucial role in setting the accretion disk's the inner edge. Further, we analyze the characteristics of the epicyclic motion and determine the generic form for the epicyclic frequencies. Our results demonstrate that the existence of the magnetic coupling parameter can account for the observed resonance of high frequency QPOs from selected three specific microquasars. We have applied the Monte Carlo simulations with the observed frequencies for three selected microquasars to constrain the parameters of the magnetically charged stringy black holes as well as coupling parameters that describe the interaction between the particle and the black hole. Finally, we study in detail the radiation properties of the accretion disk in the close vicinity of black hole. We show that the magnetic coupling parameter can have significant influence on the radiation flux of the accretion disk.