QCD PHASE-TRANSITION AT FINITE-TEMPERATURE IN THE DUAL GINZBURG-LANDAU THEORY

We study the pure-gauge QCD phase transition at finite temperatures in the dual Ginzburg-Landau theory, an effective theory of QCD based on the dual Higgs mechanism. We formulate the effective potential at vari ous temperatures by introducing the quadratic source term, which is a new useful method to obtain the effective potential in the negative-cu rvature region. Thermal effects reduce the QCD-monopole condensate and bring a first-order deconfinement phase transition. We find a large r eduction of the self-interaction among QCD monopoles and the glueball masses near the critical temperature by considering the temperature de pendence of the self-interaction. We also calculate the string tension at finite temperatures.