VACUUM POLARIZATION AND DYNAMICAL CHIRAL SYMMETRY BREAKING IN QUANTUM ELECTRODYNAMICS

Abstract

The Schwinger-Dyson equation for the fermion mass function taking into account the vacuum polarization effects is considered. It is shown that even in the “zero-charge” situation there exists, at rather large coupling constant (α > α_c), a solution with spontaneously broken chiral symmetry. The existence of the local limit in the model concerned is discussed.