Seminar by Ivan Agulló

Speaker: Ivan Agulló, LSU

Place: The Cloud

Date: Thursday July 29th

Time: 12pm Central.

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Recorded lecture.

Title: Stimulated Hawking effect on an Optical White-Black Hole

Abstract:

In this informal talk I’ll summarize my recent work 2107.10217 with A. Brady and D. Kranas, on which we study the Hawking effect in optical systems containing the analog of a pair white-black hole. Our work contains a synergistic combination of analytical and numerical methods. Our analytical treatment is based on techniques from quantum Gaussian information, and it provides a simple and efficient model to describe all aspects of the out state, including the entanglement between any bi-partition. These tools allow us to analyze for the first time subtle aspects of the Hawking process, like the influence that ambient thermal noise and detector inefficiencies have on the out state. We find that aspects of the Hawking effect that are of quantum origin, i.e.\ quantum entanglement, are extremely fragile to the influence of inefficiencies and noise. More importantly, we propose a protocol to amplify and observe these quantum aspects, based on seeding the process with a single-mode squeezed input. Our ideas open the door to new possibilities of experimental verification of the Hawking effect.

Seminar by Francesco Sartini

 

Speaker: Francesco Sartini, ENS Lyon

Place: The Cloud

Date: Thursday July 22nd

Time: 12pm Central.

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https://lsu.zoom.us/j/6574388959

Title: Black Hole interior: Symmetries and regularization

Abstract:

The spacetime in the interior of a black hole can be described by an homogeneous line element, for which the Einstein–Hilbert action reduces to a one-dimensional mechanical model. We have shown that this model exhibits a symmetry under the (2+1)-dimensional Poincaré group. The existence of this symmetry provides a powerful criterion to discriminate between different regularization and quantization schemes. It also unravels new aspects of symmetry for black holes, and opens the way towards a rigorous group quantization of the interior. Remarkably, the physical ISO(2,1) symmetry can be seen as a broken infinite-dimensional symmetry. This is done by reinterpreting the action for the model as a geometric action for the BMS3 group, where the configuration space variables are elements of the algebra bms3 and the equations of motion transform as coadjoint vectors.