Ghostbusters: unitarity and causality of non-equilibrium effective field theories

Abstract: For a non-equilibrium physical system defined along a closed time path (CTP), a key constraint is the so-called largest time equation, which is a consequence of unitarity and implies causality. In this paper, we present a simple proof that if the propagators of a non-equilibrium effective...

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Bibliographic Details
Main Authors: Gao, Ping, Glorioso, Paolo, Liu, Hong
Other Authors: Massachusetts Institute of Technology. Center for Theoretical Physics
Format: Article
Language:English
Published: Springer Science and Business Media LLC 2020
Online Access:https://hdl.handle.net/1721.1/126120