Location: Groningen. Erik Tonni (SISSA), Julian Sonner (Geneva), Jeff Murugan (Kaapstad) and David Berenstein (Santa Barbara).
|Date||24 May 2019|
Please be advised that this month our D-ITP Holography meeting will take a break to allow for the yearly meeting of the Scanning New Horizons Program.
Please take a look at https://snhprogram.nl/event/groningen-scanning-new-horizons-meeting-snh2019/ for updates on the program.
All SNH participating institutions, D-ITP members and its sister nodes (Amsterdam, Groningen, Leiden, Utrecht, KU Leuven, ULB, VUB, UMONS) are invited to participate in this fun event!
11:15 Erik Tonni (SISSA) - On entanglement hamiltonians in 1D free lattice models
Abstract: The reduced density matrix can be written as the exponential of the entanglement hamiltonian, hence this operator contains a lot of information about the entanglement of the bipartition when the entire system is in certain pure state. We discuss the derivation of the entanglement hamiltonian of an interval for a massless Dirac fermion in the ground state through the continuum limit of the correspondin lattice results in the free fermions chain. We also present numerical studies about the temporal evolution of the entanglement hamiltonians
and of the contours for the entanglement entropy of an interval after a global quench in a harmonic chain and in a chain of free fermions.
13:30 Julian Sonner (Geneva) - Quantum Thermalization in AdS/CFT
Abstract: via the AdS/CFT duality we can view black holes as thermal ensembles of the dual field theory. In my talk I will report on several detailed studies of low-dimensional examples such as 2D CFTs and SYK-like models, which investigate and extend the scenario of thermalization via eigenstates as the boundary description of black holes and their dynamics.
15:00 Jeff Murugan (Kaapstad) - Developments in randomness and chaos.
Abstract: Motivated by trying to understand the difference between randomness and true chaos in quantum many-body systems, I will review a selection of recent developments in the field. I will focus on two examples; the first is a variant of the more familiar SYK model while the second is a new class of problem we call quantum small worlds.
16:00 David Berenstein (Santa Barbara) - Topology, superposition and typicality in quantum gravity
Abstract: I will describe recent advances in the study of quantum gravity where one can explicitly show in examples that superpositions of states with fixed topology can change the topology of spacetime. These effects lead to paradoxes that are resolved in effective field theory by the introduction of code subspaces. I will also talk about more typical states and issues related on how to decide if a black hole horizon is smooth or not.
The meeting will be organised in Het Kasteel, Melkweg 1, 9718 EP Groningen which is a pleasant 15 minute walk from the station.