Non-Abelian field strength bilocal correlator at finite temperature in   the model of dilute instanton gas
  Bilocal correlator in gluodynamics is evaluated at finite temperature in the framework of instanton gas model. It is demonstrated that vacuum correlation length decreases with a growing temperature. Obtained results are compared with lattice data for the bilocal correlator at finite temperature. Density of instantons and possible structures of nonperturbative vacuum are discussed. 
N.O.Agasian and S.M.Fedorov