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arXiv 1803.09682gr-qcastro-ph.HE
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磁化Schwarzschild黑洞周围带电粒子的辐射反应

Radiation reaction of charged particles orbiting magnetized Schwarzschild black hole

Arman Tursunov, Martin Kološ, Zdeněk Stuchlík, Dmitri V. Gal'tsov

摘要:

在许多与天体物理有关的情况下,作用在电荷上的辐射反作用力是不可忽略的,因而产生了在这种情况下圆轨道的位置和稳定性问题。在平坦时空中,带有辐射反应的点电荷的运动可用Lorenz-Dirac(LD)方程描述,而在弯曲时空中,则用包含Ricci项和尾项的DeWitt-Bertzme(DWB)方程描述。我们表明,基本粒子在真空度规的DWB方程的运动可以减少到协变形式的LD方程,我们在这里使用。一般来说,LD方程是困扰失控的解决方案,所以我们讨论的计算方法,以避免这个问题,在构造数值解。我们还使用协变LD方程,这是协变的Landau-Lifshitz方程的第一次迭代,比较这两种方法的结果,并显示在超相对论的情况下的三阶Schott项的小。我们计算了相应的能量和角动量损失的粒子和研究的阻尼带电粒子振荡的平衡半径。我们发现,取决于洛伦兹力的方向,振荡的带电粒子要么螺旋下降到黑洞,或稳定的圆形轨道衰减其振荡。后一种情况导致一个有趣的新结果,即粒子轨道从黑洞向外移动。我们还讨论了所提出的方法的天体物理相关性,并提供模型的主要参数的估计。

英文摘要:

In many astrophysically relevant situations radiation reaction force acting upon a charge can not be neglected and the question arises about the location and stability of circular orbits in such regime. Motion of point charge with radiation reaction in flat spacetime is described by Lorenz-Dirac (LD) equation, while in curved spacetime -- by DeWitt-Brehme (DWB) equation containing the Ricci term and the tail term. We show that for the motion of elementary particles in vacuum metrics the DWB equation can be reduced to the covariant form of the LD equation which we use here. Generically, the LD equation is plagued by runaway solutions, so we discuss computational ways to avoid this problem in constructing numerical solutions. We also use the first iteration of the covariant LD equation which is the covariant Landau-Lifshitz equation, comparing results of these two approaches and showing smallness of the third-order Schott term in the ultrarelativistic case. We calculate the corresponding energy and angular momentum loss of a particle and study the damping of charged particle oscillations around an equilibrium radius. We find that depending on the orientation of the Lorentz force, the oscillating charged particle either spirals down to the black hole, or stabilizes the circular orbit by decaying its oscillations. The later case leads to an interesting new result of shifting of the particle orbit outwards from the black hole. We also discuss the astrophysical relevance of the presented approach and provide estimations of the main parameters of the model.

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