Functional renormalization group study of the quark-meson model beyond the local potential approximation: Kurganov--Tadmor versus the grid method

Abstract

We solve the functional renormalization group flow of the two-flavor quark-meson model at finite temperature and quark chemical potential with Litim's regulator, using the Kurganov--Tadmor central scheme and the standard grid method, both in the local potential approximation (LPA) and in an LPA${}^{\prime }$ truncation with running wave function renormalization factors for the pion, sigma, and quark fields. Using the Kurganov--Tadmor scheme as a high-resolution benchmark down to very low temperatures, where the Fermi surface produces the sharpest fronts in the field derivative of the potential, we find that, with sufficiently fine resolution, the grid method gives virtually identical results in both truncations. We discuss the difficulties that the wave function renormalization factors bring into the parametrization of the model and into the flow at finite density, related to the choice of the expansion point. Contrary to some expectations, the peculiar backbending of the first-order phase boundary at low temperature, known from LPA, persists in our implementation of the LPA${}^{\prime }$ truncation, both with a fixed and with a running expansion point.

arXiv comment39 pages, 6 figures, 2 tables. Fig. 6 updated after correcting the evaluation of the derivatives of the potential in the Z flows; conclusions unchanged