Claudio Dappiaggi - On the role of asymptotic structures in the construction of quantum states for free field theories on curved backgrounds

Auteur(s) : DAPPIAGGI CLAUDIO    03-07-2014  Éditeur(s) : Fanny Bastien;     Description : In the algebraic approach to quantum field theory on curved backgrounds, there exists a special class of quantum states for free fields, called of Hadamard form. These are of particular relevance since they yield finite quantum fluctuations of all observables and they can be used to implement interactions at a perturbative level. Although their existence is guaranteed on all globally hyperbolic spacetimes, for long time only few explicit examples were known. A way to bypass this problem exists on those manifolds which possess a null conformal boundary, such as all asymptotically flat spacetimes. In this talk we shall discuss this construction in particular for massless, conformally coupled scalar fields and for linearised gravity. Mots-clés libres : Mathèmatiques, Grenoble, école d'été, General Relativity, institut fourier, summer school, asymptotic analysis Classification générale : Mathématiques Accès à la ressource : http://www.canal-u.tv/video/institut_fourier/claud... rtmpt://fms2.cerimes.fr:80/vod/institut_fourier/cl... Conditions d'utilisation : Droits réservés à l'éditeur et aux auteurs. CC BY-NC-ND 4.0

DONNEES PEDAGOGIQUES Type pédagogique : cours / présentation Niveau : doctorat DONNEES TECHNIQUES Format : video/x-flv Taille : 2.18 Go Durée d'exécution : 1 heure 5 secondes

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