Marc HenneauxCollège de FranceChamps, cordes et gravitéAnnée 2022-2023La structure asymptotique de l'espace-temps (II)Séminaire - Juan Valiente Kroon : Asymptotics at Null Infinity: the Role of Spatial InfinityIn this overview talk I will discuss the relation between the asymptotic behaviour of the gravitational at null infinity and spatial infinity the so-called problem of spatial infinity. I will argue that the conditions assumed by Penrose in his programme to study isolated systems in General Relativity are too restrictive to describe generic spacetimes. I will also discuss how a conformal approach to the study of the structure of spatial initiated by H. Friedrich offers the tantalising possibility of settling down the problem of spatial infinity thus providing us with a full understanding of the way that Cauchy data determines the asymptotic behaviour of the gravitational field. I will present some applications of these ideas to, for example, the computation of asymptotic charges.

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