Aspects of gluon propagation in Landau gauge: spectral densities, and mass scales at finite temperature

TL;DR

This paper develops a method to extract gluon spectral densities from lattice data and interprets the finite-temperature Landau-gauge gluon propagator as a massive bosonic propagator.

Contribution

It introduces a novel approach for obtaining spectral densities and provides insights into gluon behavior at finite temperature.

Findings

Successfully extracted gluon spectral densities from lattice data.

Interpreted the finite-temperature gluon propagator as a massive bosonic propagator.

Enhanced understanding of gluon properties in thermal QCD environments.

Abstract

We discuss a method to extract the K\"all\'en-Lehmann spectral density of a particle (be it elementary or bound state) propagator and apply it to compute gluon spectral densities from lattice data. Furthermore, we also consider the interpretation of the Landau-gauge gluon propagator at finite temperature as a massive-type bosonic propagator.