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Edge states and symmetries in gravity

Marc Geiller (Laboratoire de Physique, ENS de Lyon)
When Jul 01, 2021
from 02:00 to 03:00
Where visioconférence
Attendees Marc Geiller
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Jeudi 1 Juillet

 

Title: Edge states and symmetries in gravity

 Marc Geiller (Laboratoire de Physique, ENS de Lyon)

 

Abstract:  

In gravity the notion of energy is a priori ill-defined because there is no true Hamiltonian. Instead, the Hamiltonian is a pure constraint and as such vanishes on-shell. To understand the way out of this difficulty, one should carefully distinguish between the notion of gauge and physical symmetries, which acquires a meaning when working in bounded regions of spacetime. When considering boundaries, gravity reveals its holographic nature and gives access to new types of observables. I will explain how these observables and their algebraic structure gives new hopes for understanding the quantum nature of gravity.