Joint Theory Seminar: Romuald Janik

Title: From the Ising model to quantum gravity with matter and the black hole information paradox

Abstract: In this talk, I show that the Ising model CFT can be used to obtain some clear insights into 3D (quantum) gravity with matter. I review arguments for the existence of its holographic description, and analyze the time dependence of perturbations of the theory at high temperature, which would correspond to throwing matter into a black hole in the dual gravitational picture. After an initial exponential damping - consistent with absorption by the black hole - the signal remarkably reemerges again, apparently at odds with the expected black hole behaviour. Using the exact solvability of the Ising model CFT, one can read off the behaviour of the bulk matter fields which is responsible for this remergence and thus allows for evading the black hole information paradox. I argue that the observed mechanism should be generic in the AdS3/CFT2 context and appear for any CFT2.