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VOLUME 58 | ISSUE 12 | PAGE 886
Properties of a hot hadron vacuum
For nucleons, as for electrons in semiconductors at high temperatures, the energy gap separating nucleon states from antinucleon states is blurred. The blurring stems from a restructuring of the spectrum of nucleons in the dense medium of thermal pions. The equation of state of the hadron vacuum has an end point; i.e., there exists a limiting temperature Tk above which a hadron vacuum does not exist even in a metastable state. A deconfinement temperature is estimated.

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