David Ruelle made fundamental contributions in various aspects of mathematical physics. In quantum field theory, the most important contribution is the rigorous formulation of scattering processes based on Wightman's axiomatic theory. This approach is known as the Haag–Ruelle scattering theory. Later Ruelle helped to create a rigorous theory of statistical mechanics of equilibrium, that includes the study of the thermodynamic limit, the equivalence of ensembles, and the convergence of Mayer's series. A further result is the Asano-Ruelle lemma, which allows the study of the zeros of certain polynomial functions that are recurrent in statistical mechanics.
The study of infinite systems led to the local definition of Gibbs states or to the global definition of equilibrium states. Ruelle demonstrated with Roland L. Dobrushin and Oscar E. Lanford that translationally invariant Gibbs states are precisely the equilibrium states.
Together with Floris Takens, he proposed the description of hydrodynamic turbulence based on strange attractors with chaotic properties of hyperbolic dynamics.
Ruelle, David (1999). Statistical mechanics: Rigorous results. World Scientific. ISBN978-9810238629. 1st edition 1969
Ruelle, David (2004). Thermodynamic formalism: the mathematical structure of equilibrium statistical mechanics. Cambridge University Press. ISBN978-0521546492. 1st edition 1978
Ruelle, David (2004). Dynamical zeta functions for piecewise monotone maps of the interval. American Mathematical Society. ISBN978-0821836019.
Ruelle, David (1995). Turbulence, strange attractors and chaos. World Scientific. ISBN978-9810223113.
Ruelle, David (2008). Chaotic evolution and strange attractors. Vol.1. Cambridge University Press. ISBN978-0521368308. 1989 edition
Ruelle, David (2014). Elements of differentiable dynamics and bifurcation theory. Elsevier. ISBN978-1483245881. 1989 1st edition
Ruelle, David; Takens, Floris (1971). "On the nature of turbulence". Les rencontres physiciens-mathématiciens de Strasbourg. 12: 1–44.
Ruelle, David (1995). "Turbulence, Strange Attractors, and Chaos". World Scientific. 16: 195. Bibcode:1995tsac.book.....R.