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Canonical realization of Bondi-Metzner-Sachs symmetry: Quadratic Casimir

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We study the canonical realization of Bondi-Metzner-Sacks symmetry for a massive scalar field introduced by Longhi and Materassi [J. Math. Phys. 40, 480 (1999)]. We construct an invariant scalar product for the generalized momenta. As a consequence we introduce a quadratic Casimir with the supertranslations.

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Articles publicats en revistes (Física Quàntica i Astrofísica)

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Canonical realization of Bondi-Metzner-Sachs symmetry: Quadratic Casimir