Absence of thermalization for systems with long-range interactions coupled to a thermal bath

Abstract : We investigate the dynamics of a small long-range interacting system, in contact with a large long-range thermal bath. Our analysis reveals the existence of striking anomalies in the energy flux between the bath and the system. In particular, we find that the evolution of the system is not influenced by the kinetic temperature of the bath, as opposed to what happens for short-range collisional systems. As a consequence, the system may get hotter also when its initial temperature is larger than the bath temperature. This observation is explained quantitatively in the framework of the collisionless Vlasov description of toy models with long-range interactions and shown to be valid whenever the Vlasov picture applies, from cosmology to plasma physics.
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https://hal.archives-ouvertes.fr/hal-02070760
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Submitted on : Monday, March 18, 2019 - 11:25:26 AM
Last modification on : Wednesday, August 21, 2019 - 9:02:02 PM

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Pierre de Buyl, Giovanni de Ninno, Duccio Fanelli, Cesare Nardini, Aurelio Patelli, et al.. Absence of thermalization for systems with long-range interactions coupled to a thermal bath. Physical Review E : Statistical, Nonlinear, and Soft Matter Physics, American Physical Society, 2013, 87 (4), ⟨10.1103/PhysRevE.87.042110⟩. ⟨hal-02070760⟩

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