Thermal rho's in the quark-gluon plasma

I discuss different models which predict changes in the mass of the thermal $ρ$ field. I emphasize that while the predictions are strongly model dependent, nevertheless substantial shifts in the thermal $ρ$ mass are expected to occur at the point of phase transition. As long as the thermal $ρ$ peak does not become too broad, this should provide a striking signature of the existence of a phase transition. (Based upon a talk presented at Quark Matter '95, Monterey, CA, Jan., 1995.)

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