Marc HenneauxCollège de FranceChamps, cordes et gravitéAnnée 2022-2023La structure asymptotique de l'espace-temps (II)Séminaire - Marios Petropoulos : Charges and Dual Charges – a Carrollian PerspectiveIntervenant(s)Marios Petropoulos, École Polytechnique, Palaiseau, FranceCarroll geometries emerge as conformal boundaries of asymptotically flat spacetimes and have come to the forefront with the advent of flat holography. I will introduce these tools, which encompass the Carrollian descendants of the Cotton tensor, and show how they are used for generating towers of electric and magnetic charges. This approach sets the appropriate framework for unravelling the boundary local manifestation of hidden electric/magnetic duality symmetries such as Ehlers' Möbius symmetry present in four-dimensional Ricci-flat spacetimes that enjoy an isometry.

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