Wilsonian exact renormalization group flow in the gauged Nambu--Jona-Lasinio model

Abstract

We study the Wilsonian exact renormalization group flow of the gauged Nambu--Jona-Lasinio (NJL) model, a four-dimensional $U(1)$ gauge theory with chirally invariant four-Fermi interactions, by using the gradient flow exact renormalization group~(GFERG). Our gauge-invariant ansatz (truncation) for the 1PI Wilson action keeps a general photon kinetic function~${\mathcal{K}}_{\tau }(k^2)$, the fermion mass, and the scalar and vector four-Fermi couplings. For a fixed gauge coupling~$e^2$, the Gaussian and NJL (quasi-)fixed points on the critical surface merge at~$e_c^2\simeq 17$, as anticipated by the ladder Schwinger--Dyson equation and the conventional Wilsonian renormalization group. We then let $e^2$ itself flow. Owing to the manifest gauge invariance of the GFERG, the flow of~$e^2$ is governed solely by the photon anomalous dimension~${\gamma }_A$, which remains positive along both branches up to the merging point. Hence, no fixed point with~$e^2\ne 0$ exists. Flows from a sufficiently large~$e^2$ in the ultraviolet (UV) reach the chirally broken phase even for vanishing four-Fermi couplings, so the gauge interaction does trigger chiral symmetry breaking. The merging point, however, is not a fixed point, and the gauge coupling vanishes in any continuum limit within our truncation.

arXiv comment29 pages, 8 figures