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Updated: Dec 7, 2025

An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids
Published on: December 4, 2017
Exact Coarse Graining Preserves Entropy Production out of Equilibrium
Gianluca Teza1, Attilio L Stella2
1Department of Physics of Complex Systems, Weizmann Institute of Science, Rehovot 7610001, Israel and Department of Physics and Astronomy, University of Padova, Via Marzolo 8, I-35131 Padova, Italy.
Abstract:
The entropy production rate associated with broken time-reversal symmetry provides an essential characterization of nanosystems out of equilibrium, from driven colloidal particles to molecular motors. Limited access to the dynamical states is generally expected to hinder the correct estimation of this observable. Here we show how memoryless jump processes can be coarse grained, exactly preserving its average and fluctuations at stationarity. This supports univocal applicability of fluctuation theorems for entropy and allows inference of the genuine thermodynamics together with inaccessible process details.
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