Records from the S-Matrix Marathon: Schwinger-Keldysh Formalism
Abstract
These notes provide an overview of real-time techniques in quantum field theories and holography. We outline the general rationale and principles underlying the Schwinger-Keldysh formalism and its out-of-time-order generalizations. To illustrate its broad utility we frame our discussion in the language of open quantum dynamics. As a specific application we describe how such real-time observables help in understanding scrambling dynamics. We also describe the holographic prescription for computing thermal Schwinger-Keldysh observables. These notes are based on a series of lectures held during the S-Matrix Marathon workshop at the Institute for Advanced Study on 11-22 March 2024.
Keywords
Cite
@article{arxiv.2410.10602,
title = {Records from the S-Matrix Marathon: Schwinger-Keldysh Formalism},
author = {Felix M. Haehl and Mukund Rangamani},
journal= {arXiv preprint arXiv:2410.10602},
year = {2024}
}
Comments
43 pages. A chapter to be published by Springer Lecture Notes in Physics