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

Authors: Paulo J. Silva, Orlando Oliveira, David Dudal, Martin Roelfs

Ref.: EPJ Web of Conferences 175, 07038 (2017)

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 Källén-Lehmann spectral density is computed, using a Tikhonov regularisation together with the Morozov discrepancy principle. Implications for gluon confinement are also discussed.