On fast quenches and spinning correlators

TL;DR

This paper investigates the universal behavior of two-point correlation functions in quantum field theories undergoing fast quenches, revealing scaling laws and connections to operator product expansion techniques.

Contribution

It derives universal scaling laws for correlators during fast quenches in systems with UV fixed points, linking results to operator product expansion methods.

Findings

Universal scaling behavior of correlators during fast quenches

Correlation functions can be approximated using operator product expansion in certain regimes

Results apply to Dirac fields and spin-1 currents in UV fixed point theories

Abstract

We study global quantum quenches in a continuous field theoretic system with UV fixed point. Assuming that the characteristic inverse time scale of the smooth quench is much larger than all scales inherent to the system except for the UV-cutoff, we derive the universal scaling behavior of the two-point correlation functions associated with Dirac fields and spin-1 currents. We argue that in certain regimes our results can be recovered using the technique of operator product expansion.