Abstract
The pion nucleon vertex function at finite temperature is studied in two frameworks: (a) the thermal (linear) sigma model to leading (one-loop) order, and (b) a thermal QCD-Finite Energy Sum Rule. Both approaches indicate that the strength of the pion-nucleon coupling decreases with increasing T, vanishing at a critical temperature. The associated mean-square radius is a monotonically increasing function of T, diverging at the critical temperature. We interpret this fact as (analytical) evidence for deconfinement.
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