Near-horizon Collisions at the Extreme: Naturalness and Observability of Critical Near-horizon Collisions around Near-extremal Black Holes

par Delilah Gates (Harvard University, USA)

mardi 20 oct. 2026, 14:45 → 16:00 Europe/Paris

Amphithéâtre Léon Motchane (IHES)

Séminaire Amplitudes et Gravitation sur l'Yvette (IHES/IPhT)

In principle, rapidly rotating black holes could naturally act as particle colliders because geodesics particles that collide can exhibit center-of-mass (CM) energies that diverges in the limit that the black hole approaches extremality and the collision radius approaches the horizon, provided that one particle has a critically tuned angular momentum. In this talk, I present work to understand the naturalness and observability of these critical-particle collisions around near-extremal BHs. I will highlight 1) the landscape of conditions under which these critical-particle collisions occur, 2) the CM energy achievable for critical-particle collision where one particle falls from in from infinity and the other particle is part of an accretion disk, and 3) the observability as measure by the escape probability and expected energy of emission born of a critical-particle collision.

 

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