黑洞并非只会吞噬，它们也是强大的加速器。
靠近自转黑洞的吸积盘与强磁场可以通过Blandford–Znajek机制将旋转能转为电磁能，发射相对论喷流，把粒子加速到接近光速；在旋转黑洞的消旋带（ergosphere）还能通过Penrose过程提取能量。
喷流内部的冲击波与磁湍动实现Fermi加速，产生高能宇宙射线与伽马辐射。
两黑洞并合时释放的引力波若不对称，会令合并残骸获得“反冲”速度，推动黑洞本身运动。
观测到的类星体喷流、活动星系核辐射以及引力波合并后的位移，均支持黑洞在多尺度上作为宇宙加速器的角色，并对星系能量反馈与演化产生深远影响。
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