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PIRSA:22100027

Hamiltonian Gauge Theory With Corners II: memory as superselection in null YM theory

APA

Riello, A. (2022). Hamiltonian Gauge Theory With Corners II: memory as superselection in null YM theory. Perimeter Institute. https://pirsa.org/22100027

Aldo Riello Perimeter Institute for Theoretical Physics

Talk numberPIRSA:22100027
Talk Type Conference
Subject

Abstract

On Tuesday, M. Schiavina laid out the theoretical framework for the symplectic reduction of gauge theories in the presence of corners. In this talk I will apply this theoretical framework to Yang-Mills theory on a null boundary and show how a pair of soft charges controls the residual (corner) gauge symmetry after the first-stage symplectic reduction, and therefore the superselection structure of the theory after the second-stage symplectic reduction. I will also discuss the subtleties of the gauge A_u = 0, the interpretation of electromagnetic memory as superselection, and how the nonlinear structure of the non-Abelian theory complicates this picture.