Abstract
Vector Meson Dominance ideas together with a finite Energy QCD sum rule allows for the determination of the q 2- and the T-dependence of the effective hadronic coupling constant g ϱππ in the space-like region. It turns out that g ϱππ ( q 2, T) vanishes at the critical temperature T c , independently of q 2. A comparison with a previous independent QCD determination of the electromagnetic pion form factor at finite temperature supports the validity of Vector Meson Dominance at finite temperature. We find also that the pion radius increases with T, having a divergent behavior at T c .
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