Spectral function at high temperature

TL;DR

This paper introduces a nonperturbative method for computing spectral functions in real time for a weakly coupled quantum field at high temperature, using classical approximation techniques demonstrated on a 2+1 dimensional scalar field.

Contribution

It presents a novel nonperturbative approach to spectral function computation leveraging classical approximation at high temperature.

Findings

Spectral functions computed nonperturbatively in real time.

Method applied successfully to a 2+1 dimensional scalar field.

Provides insights into nonperturbative real-time dynamics.

Abstract

For a weakly coupled quantum field at high temperature the classical approximation offers a possibility to gain insight into nonperturbative real-time dynamics. I use this to present a nonperturbative approach to the computation of spectral functions in real time. Results are shown for a scalar field in 2+1 dimensions.