Elba Alonso-Monsalve (MIT) “Phase space of JT gravity with positive cosmological constant”
Abstract: We construct the classical phase space of Jackiw-Teitelboim (JT) gravity with positive cosmological constant on spatial slices with circle topology. We identify solutions not previously discussed in the literature, and find the phase space has many singular points and is not even Hausdorff. Nonetheless, it admits a group-theoretic description which is quite amenable to quantization. We comment on next … Read More
Martin Sasieta (UCB) “Baby Universes from Thermal Pure States in SYK”
Abstract: I will present a simple holographic model of closed universes originating from the black hole interior in JT gravity. The model relies on the insertion of a heavy operator to support the baby universe, together with a first-order phase transition between a black hole phase and an empty AdS phase. To this end, I will employ the Maldacena–Qi phase … Read More
Batoul Banihashemi (Stanford) “Reconstruction of de Sitter space beyond a single patch”
Abstract: I will describe implementing the TTbar-formalism to construct the entire de Sitter space bounded by two timelike boundaries. In previous works a finite Hamiltonian quantum mechanics system was developed for a bulk with a single timelike boundary. The holographic dual theory contains bands of energy levels that correspond to bounded patches of semiclassical gravity with positive cosmological constant and matter. … Read More
Bartek Czech (Institute for Advanced Study, Tsinghua University) ” A lesson from stabilizer states: Holography abhors syzygies
Abstract: Stabilizer states are a convenient and well-studied class of quantum states, with many applications including quantum error correction. One reason why they may NOT be good toy models of holographic systems is that they do not generally obey the constraints on entanglement entropies, which are implied by the Ryu-Takayanagi proposal. (Such constraints are collectively known as the holographic entropy … Read More