Séminaire de Physique Théorique
Topics in string amplitudesHarold Erbin (Université de Turin)
Thursday 05 December 2019 14:00 - Tours - Salle 1180 (Bât E2)
Résumé :
In this talk, I will present two recent results on string amplitudes. First, I will explain how a correct computation of the 2-point amplitude on the sphere matches the expected result from QFT, instead of vanishing as it was long believed. Second, I will outline the proofs of primitive analyticity and crossing symmetry for superstring amplitudes to all orders in perturbation theory. Since these properties are related to locality and causality in position space in standard QFTs, this opens a possible window on the nature of the interaction non-locality and how it fits within the usual QFT axioms. arxiv: 1810.07197, 1906.06051
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