Short timescale variability is often associated with a black hole system. The consequence of an electromagnetic outflow suddenly generated near a Kerr black hole is considered assuming that it is described by a solution of a force-free field with a null electric current. We compute charged particle acceleration induced by the burst field. We show that the particle is instantaneously accelerated to the relativistic regime by the field with a very large amplitude, which is characterized by a dimensionless number $\kappa$. Our numerical calculation demonstrates how the trajectory of the particle changes with $\kappa$. We also show that the maximum energy increases with ${\kappa }^{2/3}$. The typical maximum energy attained by a proton for an event near a super massive black hole is $E_{\max }\sim 100$ TeV, which is enough observed high-energy flares.

中文翻译：

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克尔黑洞附近的空电磁场驱动的粒子加速

短时标变化通常与黑洞系统有关。假定在Kerr黑洞附近突然产生电磁流出的结果，可以认为是用零电流的无力场的解来描述的。我们计算由突发场引起的带电粒子加速度。我们显示粒子被非常大振幅的场瞬时加速到相对论状态，其特征在于无量纲数$\kappa$。我们的数值计算证明了粒子的轨迹如何随$\kappa$。我们还表明最大能量随${\kappa }^{2/3}$。在超大质量黑洞附近发生的事件中，质子获得的典型最大能量为${Ë}_{\mathrm{最高}}〜100$ TeV，足以观察到高能耀斑。