Generic long-range correlations in nonequilibrium mixtures

Jessica Metzger; Yariv Kafri; Mehran Kardar; Julien Tailleur

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arXiv · 2606.14651

Generic long-range correlations in nonequilibrium mixtures

Jessica Metzger·Yariv Kafri·Mehran Kardar·Julien Tailleur

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Abstract

We study correlation functions in generic non-equilibrium mixtures, including multi-temperature systems and non-reciprocal field theories. The corresponding linear theory is short-ranged, and nonlinearities are irrelevant in the renormalization-group sense. Nonetheless, we find that these nonlinearities generate long-ranged three-point correlations in the isotropic disordered phase. Our analytical predictions, which are based on a phenomenological theory, are confirmed by numerical simulations of Brownian colloids in contact with thermal baths at different temperatures. Dangerously irrelevant nonlinearities in non-equilibrium mixtures thus offer a new route to long-range correlations, supporting the hypothesis that such correlations are not the exception but the rule out of equilibrium.

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Jessica Metzger, Yariv Kafri, Mehran Kardar, Julien Tailleur. 2026-06-12. Generic long-range correlations in nonequilibrium mixtures. https://arxiv.org/abs/2606.14651

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