Gauge invariant non-perturbative 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 BRST invariant non-perturbative ansatz of the 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 the 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.

Figures (2)

• Figure 1: The function $\mathcal{C}(k^2)$\ref{['eq:(4.17)']} as the function of $k^2$.
• Figure 2: The function $\mathcal{K}_\tau(k^2)$ in the 1PI Wilson action \ref{['eq:(3.5)']} at the IR fixed point in the leading large $N_f$ approximation; the horizontal axis is $k^2$.