黑洞并非只会吞噬物质，反而常成为宇宙中最强的“加速器”。
当气体落入黑洞周围的吸积盘，磁场和湍流会将角动量和能量传递出去，通过Blandford–Znajek机制或彭罗斯过程，旋转黑洞的能量被提取并驱动极性喷流，粒子在磁场和冲击波中被加速到接近光速。
并合黑洞时的引力不对称还会产生“踢动”（重力回旋），使合并残留体获得高速运动并携带物质或发出强烈电磁辐射。
观测上，活跃星系核的射电和X射线喷流、伽马暴及超高能宇宙射线都指向由黑洞驱动的高能加速过程。
这些加速现象不仅是高能天体物理的研究对象，也通过能量反吹影响星系的恒星形成与气体分布，同时为检验广义相对论和磁流体动力学提供天然实验室。
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