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An inspiralling object of mass $\mu$ around a Kerr black hole of mass $M (\gg\mu)$ experiences a continuous transition near the innermost stable circularorbit from adiabatic inspiral to plunge into the horizon as gravitationalradiation extracts its energy and angular momentum. We investigate thecollision of such an object with a generic counterpart around a Kerr blackhole. We find that the angular momentum of the object is fine-tuned throughgravitational radiation and that the high-velocity collision of the object witha generic counterpart naturally occurs around a nearly maximally rotating blackhole. We also find that the centre-of-mass energy can be far beyond the Planckenergy for dark matter particles colliding around a stellar mass black hole andas high as $10^{58}$ erg for stellar mass compact objects colliding around asupermassive black hole, where the present transition formalism is welljustified. Therefore, rapidly rotating black holes can accelerate objectsinspiralling around them to energy high enough to be of great physicalinterest.

Collision of an object in the transition from adiabatic inspiral to plunge around a Kerr black hole