Colloquium by Ahmed Almheiri

Title:   Quantum Gravity and the Black Hole Interior

Speaker:   Colin Guillarmou
Title:   On the Construction of Conformal Blocks on Surfaces and Modular Functor Associated to Liouville CFT Part 2
Abstract:   TBA

Speaker:   Hao Geng
Title:   It From ETH Part II
Abstract:   In this talk, I will recap what we discussed in the workshop and finish the rest of it. I'll explain how the Cardy boundary enriched large-c CFT ensemble enbles a derivation of the multi-intervel entanglement entropy in AdS3/CFT2 and provides a natural way to see the emergence of the replica wormhole in the calculation of the Page curve of the black hole radiation. I'll also discuss some open problems in quantum gravity inspired by our work.

Speaker:   Masamichi Miyaji
Title:   Perturbative Hilbert space of JT closed universes
Abstract:   We consider gravitational path-integral of JT gravity of closed universe in AdS and dS spacetimes, for fixed extrinsic curvature boundary conditions where the spacetime boundary is rigid rather than random. In the absence of topology change, we calculate the amplitude and identify the perturbative Hilbert space. We find the Hilbert space is given by the infinite-dimensional co-invariant Hilbert space, which can be obtained from a space of boundary conditions modded by constraints. We also propose a finite N regularization of the model, whose Hilbert space dimension is non-trivial.