Abstract:
I will describe a class of non-perturbative corrections to the density matrix of Hawking radiation, and discuss the connection to the information paradox. The effect comes from “replica wormholes”, connecting different copies in the replica trick, which leave an imprint on the physical density matrix. In two-dimensional JT gravity coupled to large-N matter fields, this is calculated in several examples, and found to give a much smaller von Neumann entropy than the usual Hawking calculation.