Riemann-Hilbert Problem and Quantum Field Theory: Integrable Renormalization, Dyson-Schwinger Equations

TL;DR

This paper explores the intersection of quantum integrable systems, renormalization, and combinatorial Hopf algebras, providing new insights into the algebraic and geometric structures underlying quantum field theory and Dyson-Schwinger equations.

Contribution

It introduces a novel family of Hamiltonian systems related to renormalization, links integrable systems with renormalization flow, and offers a new combinatorial and geometric perspective on Dyson-Schwinger equations.

Findings

Link between renormalization group and infinite-dimensional integrable systems

New fixed point equations from integral renormalization theorems

Hall polynomial and scattering formula for counterterms

Abstract

In the first purpose, we concentrate on the theory of quantum integrable systems underlying the Connes-Kreimer approach. We introduce a new family of Hamiltonian systems depended on the perturbative renormalization process in renormalizable theories. It is observed that the renormalization group can determine an infinite dimensional integrable system such that this fact provides a link between this proposed class of motion integrals and renormalization flow. Moreover, with help of the integral renormalization theorems, we study motion integrals underlying Bogoliubv character and BCH series to obtain a new family of fixed point equations. In the second goal, we consider the combinatorics of Connes-Marcolli approach to provide a Hall rooted tree type reformulation from one particular object in this theory namely, universal Hopf algebra of renormalization $H_{\mathbb{U}}$. As the consequences, interesting relations between this Hopf algebra and some well-known combinatorial Hopf algebras are obtained and also, one can make a new Hall polynomial representation from universal singular frame such that based on the universal nature of this special loop, one can expect a Hall tree type scattering formula for physical information such as counterterms. In the third aim, with attention to the given rooted tree version of $H_{\mathbb{U}}$ and by applying the Connes-Marcolli's universal investigation, we discover a new geometric explanation from Dyson-Schwinger equations.