# Analyticity of critical exponents of the $O(N)$ models from nonperturbative renormalization

### Submission summary

 As Contributors: Andrzej Chlebicki · Pawel Jakubczyk Arxiv Link: https://arxiv.org/abs/2012.00782v3 (pdf) Date submitted: 2020-12-10 09:57 Submitted by: Chlebicki, Andrzej Submitted to: SciPost Physics Academic field: Physics Specialties: High-Energy Physics - Theory Statistical and Soft Matter Physics Approach: Theoretical

### Abstract

We employ the functional renormalization group framework at second order in the derivative expansion to study the $O(N)$ models continuously varying the number of field components $N$ and the spatial dimensionality $d$. We in particular address the Cardy-Hamber prediction concerning nonanalytical behavior of the critical exponents $\nu$ and $\eta$ across a line in the $(d,N)$ plane, which passes through the point $(2,2)$. By direct numerical evaluation of $\eta(d,N)$ and $\nu^{-1}(d,N)$ we find no evidence of discontinuous or singular first and second derivatives of these functions for $d>2$. The computed derivatives of $\eta(d,N)$ and $\nu^{-1}(d,N)$ become increasingly large for $d\to 2$ and $N\to 2$ and it is only in this limit that $\eta(d,N)$ and $\nu^{-1}(d,N)$ as obtained by us are evidently nonanalytical. We provide a discussion of the evolution of the obtained picture upon varying $d$ and $N$ between $(d,N)=(2,2)$ and other, earlier studied cases, such as $d\to 3$ or $N\to \infty$.

###### Current status:
Editor-in-charge assigned