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Vidéo Année : 2014

Claudio Dappiaggi - On the role of asymptotic structures in the construction of quantum states

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Résumé

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.

Dates et versions

medihal-01318409 , version 1 (19-05-2016)

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Paternité - Pas d'utilisation commerciale - Pas de modification

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  • HAL Id : medihal-01318409 , version 1

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Claudio Dappiaggi, Fanny Bastien. Claudio Dappiaggi - On the role of asymptotic structures in the construction of quantum states : Summer School 2014 - Asymptotic analysis in general relativity. 2014. ⟨medihal-01318409⟩
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