The catalysis of chiral symmetry breaking in the massless weakly coupled QED in a magnetic field at finite temperature is studied. The temperature of the symmetry restoration is estimated analytically as $T_c\approx m_{\mathrm{dyn}},$ where $m_{\mathrm{dyn}}$ is the dynamical mass of a fermion at zero temperature.

• Received 24 April 1997

DOI:https://doi.org/10.1103/PhysRevD.56.5251