Structure of Chiral Phase Transitions at Finite Temperature in Abelian Gauge Theories.

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  • Fukazawa Kenji
    Kure National College of Technology, Kure 737-8506, Japan
  • Inagaki Tomohiro
    Information Media Center, Hiroshima University, Higashi-Hiroshima 739-8521 Japan
  • Mukaigawa Seiji
    Department of Electrical and Electronic Engineering, Faculty of Engineering Iwate University, Morioka 020-8551, Japan
  • Muta Taizo
    Department of Physics, Hiroshima University, Higashi-Hiroshima 739-8526 Japan

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The mechanism of chiral symmetry breaking is investigated in strong-coupling Abelian gauge theories at finite temperature. The Schwinger-Dyson equation in the Landau gauge is employed in the real time formalism and is solved numerically within the framework of the instantaneous exchange approximation, including the effect of the thermal mass for the photon propagator. It is found that the chiral symmetry is broken below the critical temperature T for sufficiently large coupling α. The chiral phase transition is found to be of second order, and the phase diagram in the T-α plane is obtained. It is investigated how the structure of the chiral phase transition is affected by the thermal mass in the photon propagator.

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