Gluon propagator in the instanton vacuum at non-zero temperature

We consider the modifications of gluon properties in the instanton liquid model (ILM) for the QCD vacuum at non-zero temperature T . Main parameters of ILM are average instanton size ρ¯(T ) and instanton density n(T ) =N T /V3.Using the typical phenomenological values of the average instanton size ρ¯(0) = 1/3 f m and average instanton density n(0) = 1 f m−4 we getMel(0, 0) = 362 M eV . At small T ≤ Tc ≈ 150 M eV we have rather weak T - dependence as Mel(q, T ) = Mel(0, 0)(1 − 1/6 π2ρ¯2T 2)F (q, T = 0) M eV, where form-factor F (0, 0) = 1, F (q, T ) ≤ F (q, 0) = q ¯ρK1(qρ¯).