Pantheon SEMPARIS Le serveur des séminaires parisiens Paris

Statut Confirmé
Domaines hep-th
Date Jeudi 18 Mai 2017
Heure 11:45
Institut IHP
Salle 314
Nom de l'orateur Tourkine
Prenom de l'orateur Piotr
Addresse email de l'orateur
Institution de l'orateur DAMTP
Titre A new look at the pertubative expansion of quantum field theory
Résumé Scattering amplitudes are central in high energy physics. They bridge the gap between theory and experiment, and major progress over the last 25 years have lead us to discover an unexpected simplicity underlying the theories that describe nature (gauge, gravity). In this talk I aim to introduce an elegant formalism that takes a radically new look to the computation of S-matrix elements, based on the Cachazo-He-Yuan formulae and the ambitwistor string. I will present some work of mine, in collaboration with two groups (*). This first part will concern the extension of this formalism to loops. The second explains that the deep raison d’être of this elegant formalism is a special kind of string theory called “null strings”, whose quantization give rise to ambitwistor strings. This program gives the hope to be able to develop a complete reformulation of the loop expansion in QFTs. (*): Geyer-Mason-Monteiro; Casali-Herfray
Numéro de preprint arXiv
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