黑洞虽本身以重力著称，但其周围环境可以成为强大的加速器。
落入黑洞的气体在吸积盘中被压缩加热，湍流与磁场把能量传递到电荷粒子。
自转黑洞的能量可通过静止区（ergosphere）被提取，Penrose过程描述粒子在此分裂取走自转能；而更现实的磁流体机制如Blandford–Znajek过程，借助黑洞磁场把旋转能量转换为沿极轴喷出的相对论性喷流。
喷流内的冲击波和磁重联能把电子、质子加速到近光速，产生射电到伽马射线的强烈辐射，甚至可能贡献超高能宇宙射线。
观测上，类星体、活动星系核和伽马射暴均显示出这种极端加速现象。
黑洞加速不仅是高能天体物理的核心课题，也关系到反馈调控星系形成、测试广义相对论与等离子体物理的极限条件。
未来多信使观测（电磁、宇宙射线、中微子与引力波）将帮助揭示加速的微观机制与效率。
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