Randomizing excitations of half-BPS states gives near-extremal black holes

          @misc{ scivideos_PIRSA:25060018,
            doi = {10.48660/25060018},
            url = {https://pirsa.org/25060018},
            author = {Verheijden, Evita},
            keywords = {Quantum Gravity, Quantum Information},
            language = {en},
            title = {Randomizing excitations of half-BPS states gives near-extremal black holes},
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2025},
            month = {jun},
            note = {PIRSA:25060018 see, \url{https://scivideos.org/pirsa/25060018}}
          }
          

Abstract

I will discuss a concrete realization in N=4 SYM of the mechanism of cryptographic censorship: that sufficiently random time evolution in a holographic CFT incurs an event horizon in the bulk dual. I will show that perturbing half-BPS states by randomly distributing a large number of defects on them corresponds in the gravitational dual to exciting an extremal (horizonless) black hole to near-extremality. This random distribution of defects corresponds to acting with a typical random isometry on the half-BPS subspace. This allows us to interpret this process in the field theory as an extension of cryptographic censorship.