The renormalization group plays an essential role in many areas of physics, both
conceptually and as a practical tool to determine the long-distance low-energy properties of …

We study the phase diagram of a resistively shunted Josephson junction (RSJJ) in the
framework of the boundary sine-Gordon model. Using the nonperturbative functional …

We revisit the approach to the lower critical dimension d lc in the Ising-like φ 4 theory within
the functional renormalization group by studying the lowest approximation levels in the …

We investigate the massive Schwinger model in d= 1+ 1 dimensions using bosonization and
the nonperturbative functional renormalization group. In agreement with previous studies we …

The effective average action (EAA) is a scale-dependent effective action where a scale k is
introduced via an infrared regulator. The k dependence of the EAA is governed by an exact …

A bstract The functional renormalization group equation with a compactly supported smooth
(CSS) regulator function is considered. It is demonstrated that in an appropriate limit the …

A bstract We study the occurrence of spontaneous symmetry breaking (SSB) for O (N)
models using functional renormalization group techniques. We show that even the local …

In this paper we will discuss the derivation of the so-called vanishing beta function curves
which can be used to explore the fixed point structure of the theory under consideration. This …

Approximated functional renormalization group (FRG) equations lead to regulator-
dependent beta-functions, in analogy to the scheme-dependence of the perturbative …

We revisit optimization of functional renormalization group flows by analyzing regularized
loop integrals. This leads us to a principle, the Principle of Strongest Singularity, and a …