Combinatorial Mori-Zwanzig Theory

TL;DR

This paper introduces a combinatorial Mori-Zwanzig theory that develops non-perturbative, self-consistent equations for correlation functions in many-body systems using algebraic combinatorics, applicable across classical, stochastic, and quantum domains.

Contribution

It presents a novel combinatorial framework for deriving exact expansions of the Mori-Zwanzig equations, connecting to Dyson-Schwinger equations and broadening applications in many-body physics.

Findings

Derivation of the combinatorial Mori-Zwanzig equation (CMZE)

Application of Bell polynomials for series expansion

Similarity to diagrammatic skeleton expansions in quantum theory

Abstract

We introduce a combinatorial version Mori-Zwanzig theory and develop from it a family of self-consistent evolution equations for the correlation function or Green's function of interactive many-body systems. The core idea is to use an ansatz to rewrite the memory kernel (self-energy) of the regular Mori-Zwanzig equation as a function composition of the correlation (Green's) function. Then a series of algebraic combinatorial tools, especially the commutative and noncommutative Bell polynomials, are used to determine the exact Taylor series expansion of the composition function. The resulting combinatorial Mori-Zwanzig equation (CMZE) yields novel non-perturbative expansions of the equation of motion for the correlation (Green's) function. The structural equation for deriving such a combinatorial expansion resembles the combinatorial Dyson-Schwinger equation and may be viewed as its temporal-domain analogue. After introducing the abstract word and tree representation of the CMZE, we show its wide-range application in classical, stochastic, and quantum many-body systems. In all these examples, the new self-consistent expansions we obtained with the CMZE are similar to the diagrammatic skeleton expansions used in quantum many-body theory and lattice statistical field theory. We expect such a new framework can be used to calculate the correlation (Green's) function for strongly correlated/interactive many-body systems.