Lessons from discrete light-cone quantization for physics at null infinity: bosons in two dimensions

Abstract Motivated by issues in the context of asymptotically flat spacetimes at null infinity, we discuss in the simplest example of a free massless scalar field in two dimensions several subtleties that arise when setting up the canonical formulation on a single or on two intersecting null hyperpl...

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Bibliographic Details
Published in:Journal of High Energy Physics
Main Authors: Glenn Barnich, Sucheta Majumdar, Simone Speziale, Wen-Di Tan
Format: Article
Language:English
Published: SpringerOpen 2024-05-01
Subjects:
Classical Theories of Gravity
Gauge Symmetry
Global Symmetries
Models of Quantum Gravity
Online Access:https://doi.org/10.1007/JHEP05(2024)326
Description
Summary:Abstract Motivated by issues in the context of asymptotically flat spacetimes at null infinity, we discuss in the simplest example of a free massless scalar field in two dimensions several subtleties that arise when setting up the canonical formulation on a single or on two intersecting null hyperplanes with a special emphasis on the infinite-dimensional global and conformal symmetries and their canonical generators, the free data, a consistent treatment of zero modes, matching conditions, and implications for quantization of massless versus massive fields.
ISSN:1029-8479

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