Rigorous derivation of a binary-ternary Boltzmann equation for a non ideal gas of hard spheres

Ampatzoglou, Ioakeim  ; Pavlović, Nataša 

Forum of Mathematics, Sigma, Tome 13 (2025) no. 1, p. e52

Résumé

This paper focuses on dynamics of systems of particles that allow interactions beyond binary, and their behavior as the number of particles goes to infinity. More precisely, the paper provides the first rigorous derivation of a binary-ternary Boltzmann equation describing the kinetic properties of a gas consisting of hard spheres, where particles undergo either binary or ternary instantaneous interactions, while preserving momentum and energy. An important challenge we overcome in deriving this equation is related to providing a mathematical framework that allows us to detect both binary and ternary interactions. Furthermore, this paper introduces new algebraic and geometric techniques in order to eventually decouple binary and ternary interactions and understand the way they could succeed one another in time. We expect that this paper can serve as a guideline for deriving a generalized Boltzmann equation that incorporates higher-order interactions among particles.

Détail

DOI : 10.1017/fms.2025.11

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