Finite-temperature gluon spectral functions from lattice QCD.

We investigate gluon correlation functions and spectral functions at finite temperature in Landau gauge on lattice QCD ensembles with dynamical twisted-mass quarks flavors, generated by the tmfT collaboration. They cover a temperature range from using the fixed-scale approach. Our study of spectral properties is based on a novel Bayesian approach for the extraction of non-positive-definite spectral functions.

Photon propagator, monopoles, and the thermal phase transition in three dimensional compact QED.

We investigate the gauge boson propagator in the three dimensional compact Abelian gauge model in the Landau gauge at finite temperature. The presence of the monopole plasma in the confinement phase leads to the appearance of an anomalous dimension in the momentum dependence of the propagator. The anomalous dimension as well as an appropriate ratio of photon wave function renormalization constants with and without monopoles is observed to be an order parameter for the deconfinement phase transition.