Status  Confirmed 
Seminar Series  LPTENSHE 
Subjects  hepth 
Date  Wednesday 12 October 2022 
Time  14:00 
Institute  LPENS 
Seminar Room  L363, 24 rue Lhomond 
Speaker's Last Name  Marińo 
Speaker's First Name  Marcos 
Speaker's Email Address  
Speaker's Institution  University of Geneva 
Title  An introduction to resurgence in quantum theory 
Abstract  In quantum theory, we often calculate observables approximately by using perturbative series in a small parameter. These series are typically factorially divergent, so we need to make sense of them. The theory of resurgence gives a general framework to do this, and upgrades perturbative series to so called transseries, which include exponentially small corrections and make it possible to incorporate nonperturbative physics in a systematic way. Many nonperturbative techniques in quantum theory (like instanton calculus and renormalon physics) are in fact particular examples of this general framework. In these lectures I will give an introduction to resurgence with a focus on applications to quantum theory. After introducing some elementary resurgent technology, I will discuss resurgence in onedimensional quantum mechanics, and then proceed to discuss what is known about the resurgent structure of quantum field theory. 
arXiv Preprint Number  
Comments  3 lecture minicourse. Each lecture 2 hours. Inperson only 
Attachments 
To Generate a poster for this seminar : [ Postscript  PDF ]

[ English version ] 