The effective potential of composite fields in weakly coupled QED in a uniform external magnetic field
D. -S. Lee, P. N. McGraw, Y. J. Ng, I. A. Shovkovy
Abstract
The effective potential for the composite fields responsible for chiral symmetry breaking in weakly coupled QED in a magnetic field is derived. The global minimum of the effective potential is found to acquire a non-vanishing expectation value of the composite fields that leads to generating the dynamical fermion mass by an external magnetic field. The results are compared with those for the Nambu-Jona-Lasinio model.
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