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This lecture by Joaquim Gomis at the Galileo Galilei Institute (GGI) explores the canonical realization of the BMS₄ algebra and its celestial interpretation. Delve into the mathematical foundations of the Bondi-Metzner-Sachs (BMS) symmetry in four dimensions, examining how this infinite-dimensional algebra emerges in asymptotically flat spacetimes. Understand the connection between BMS symmetries and celestial holography, with particular attention to their canonical formulation and physical implications for gravitational theories. The presentation offers valuable insights for researchers and advanced students working in theoretical physics, particularly those interested in asymptotic symmetries, holography, and gravitational physics.
