Non-Perturbative Renormalization Group Analysis of the Chiral Critical Behaviors in QED
Ken-Ichi Aoki, Keiichi Morikawa, Jun-Ichi Sumi, Haruhiko Terao, Masashi Tomoyose
Abstract
We study the chiral critical behaviors of QED by using Non-Perturbative Renormalization Group (NPRG). Taking account of the non-ladder contributions, our flow equations are free from the gauge parameter (
α
) dependence. We clarify the chiral phase structure, and calculate the anomalous dimension of
ψ
¯
ψ
, which is enhanced compared to the ladder approximation. We find that the cutoff scheme dependence of the physical results is very small.