Speaker
Glenn Barnich
(Université libre de Bruxelles)
Description
Motivated by issues in the context of asymptotically flat spacetimes at null infinity, we clarify in the simplest example of a massless scalar field in two dimensions several subtleties that arise when setting up the canonical formulation on a single or on two intersecting null hypersurfaces with a special emphasis on the infinite-dimensional global and conformal symmetries, the free data, a consistent treatment of zero modes, matching conditions, implications for quantization of massless versus massive fields.
Primary author
Glenn Barnich
(Université libre de Bruxelles)
