Lattice Landau gauge gluon propagator at finite temperature: non-zero Matsubara frequencies and spectral densities

Abstract

The lattice Landau gauge gluon propagator at finite temperature is computed including the non-zero Matsubara frequencies. Furthermore, the Källén-Lehmann representation is inverted and the corresponding spectral density evaluated using a Tikhonov regularisation together with the Morozov discrepancy principle. Implications for gluon confinement are discussed.

Talk presented at Excited QCD 2017, Sintra, Portugal, 7-13 May 2017