Finite temperature gluon propagator in Landau gauge: non-zero Matsubara frequencies and spectral densities

Abstract

We report on the lattice computation of the Landau gauge gluon propagator at finite temperature, including the non-zero Matsubara frequencies. Moreover, the corresponding K\"all\'en-Lehmann spectral density is computed, using a Tikhonov regularisation together with the Morozov discrepancy principle. Implications for gluon confinement are also discussed.Comment: 5 pages, 5 figures, Lattice 2017 proceeding