Séminaires : Séminaire de Topologie

Equipe(s) : tga,
Responsables :Catherine Gille et Najib Idrissi
Email des responsables :
Salle : 1016
Adresse :Sophie Germain
Description

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Le séminaire de topologie évolue. Des après-midi de topologie seront organisées tout au long de l'année (en collaboration avec USPN) et nous vous en tiendrons informé(e)s sur cette liste de diffusion.

Orateur(s) Lukas Woike - Universität Hamburg,
Titre Homotopy theory of algebraic quantum field theories
Date27/11/2018
Horaire10:30 à 11:30
Diffusion
RésumeAlgebraic quantum field theory is a mathematical framework to investigate quantum field theories on Lorentzian spacetimes from a model-independent perspective. We describe algebraic quantum field theories as algebras over a certain colored operad. This operadic formulation allows to treat the commutativity of observables on causally disjoint spacetime regions (the so-called Einstein causality) intrinsically and enables us to set up a local-to-global extension for algebraic quantum field theories based on Fredenhagen's universal algebra construction. As a natural consequence of the operadic approach, we obtain a homotopy theory for differential graded algebraic quantum field theories. While this is mathematically interesting since it naturally leads to a homotopical relaxation of Einstein causality, we argue that it is also necessary to address open problems in quantum gauge theory. As a first non-trivial example of a non-strict homotopical algebraic quantum field theory, we discuss the homotopy orbifold of an algebraic quantum field theory on a category fibered in groupoids. The resulting theory can be interpreted as a fiber-wise groupoid cohomology with coefficients in a strict algebraic quantum field theory.

This is joint work with Marco Benini and Alexander Schenkel.
Salle1016
AdresseSophie Germain
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