Lecture: Schwinger-Keldysh formalism and open field theories

Abstract: Schwinger-Keldysh path integral is a technique to study evolution of mixed states. In this lecture, I will introduce this formalism and explain how it can be used to compute the effective action of a quantum system interacting with a bath. Such a system will undergo non-unitary evolution and is an open quantum system. Using the toy model of a Brownian particle, I will show how the data contained in the SK description can be mapped to the more familiar form of a Langevin equation.

HEP - theory

Audience: researchers in the topic

Advances in Theoretical Physics 2022

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