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We summarize main mechanisms to realize the vector manifestation (VM), inwhich the massless vector meson becomes the chiral partner of pion, at thecritical temperature in hot QCD within the framework of the model based on thehidden local symmetry. Then, we show a recent analysis on the directphoton-pi-pi coupling which measures the validity of the vector dominance (VD)of the electromagnetic form factor of the pion: The VM predicts that the VD islargely violated at the critical temperature.Comment: 12 pages, Talk given by M. Harada at MRST 2003 ``Joefest'', May  13-15, 2003, Syracuse, New York, US

Vector Manifestation in Hot Matter and Violation of Vector Dominance