Gauge-invariant nonperturbative Wilson action in quantum electrodynamics

Abstract

By employing the gradient flow exact renormalization group (GFERG), we study the renormalization group (RG) flow of a manifestly gauge- or Becchi--Rouet--Stora--Tyutin (BRST)-invariant nonperturbative ansatz of the one-particle irreducible (1PI) Wilson action in quantum electrodynamics. The gauge invariance of the Wilson action is \emph{exactly\/} preserved under the RG flow. We explicitly solve the GFERG equation in the leading and partially next-to-leading orders of the large-$N_f$ approximation, where $N_f$ is the number of flavors. We obtain gauge-invariant critical exponents and the gauge-invariant 1PI Wilson action at an infrared (IR) fixed point for~$D<4$, where $D$ is the spacetime dimension.