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Ideal tetrahedra and their duals
Recently they have been generalized to other 3d homogeneous spaces, namely 3d anti de Sitter space and half-pipe space, a 3d homogeneous space with a degenerate metric. We show that...
Nov 20, 2019
Mapping class group actions on Hopf algebra lattice models
Hopf algebra lattice models are related to certain topological quantum field theories and give rise to topological invariants of oriented surfaces. Examples are the combinatorial quantisation of Chern-Simons theory and...
Nov 28, 2019
Effective Quantum Extended Spacetime of Polymer Schwarzschild Black Hole
Effective Quantum Extended Spacetime of Polymer Schwarzschild Black Hole
Dec 03, 2019
Bulk observables in JT gravity
Using a definition of bulk diff-invariant observables, we go into the bulk of 2d Jackiw-Teitelboim gravity. By mapping the computation to a Schwarzian path integral, we study exact bulk correlation...
May 21, 2020
The Python's Lunch: geometric obstructions to decoding Hawking radiation
Harlow and Hayden [ arXiv:1301.4504 ] argued that distilling information out of Hawking radiation is computationally hard despite the fact that the quantum state of the black hole and its...
May 21, 2020
Conformal Geometry of Null Infinity, including gravitational waves
Since the seminal work of Penrose, it has been understood that conformal compactifications (or "asymptotic simplicity") is the geometrical framework underlying Bondi-Sachs' description of asymptotically flat space-times as an asymptotic...
May 28, 2020
AdS3 gravity and random CFT
We compute the path integral of three-dimensional gravity with negative cosmological constant on spaces which are topologically a torus times an interval. These are Euclidean wormholes, which smoothly interpolate between...
Jun 16, 2020
Entanglement entropies of equilibrated pure states and replica wormholes
Consider a quantum many-body system initially in a far-from-equilibrium pure state. If the system is non-integrable, the state should approach equilibrium after some time. We develop an approximation to calculate...
Jul 16, 2020
Advances in numerical techniques for spinfoam amplitudes with applications
The computation of transition amplitudes in Loop Quantum Gravity is still a hard task, especially without resorting to large-spins approximations. In Marseille we are actively developing a C library (...
Sep 10, 2020
Holography of information from semiclassical gravity
We will argue that even with semiclassical gravity, it can be shown that a copy of all the information on a Cauchy slice resides near the boundary of the slice...
Sep 17, 2020