Thermodynamic nature of irreversibility in active matter
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arXiv
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| Format: | Preprint |
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2023
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| _version_ | 1866913948916252672 |
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| author | Dabelow, Lennart Eichhorn, Ralf |
| author_facet | Dabelow, Lennart Eichhorn, Ralf |
| contents | Active matter describes systems whose constituents convert energy from their surroundings into directed motion, such as bacteria or catalytic colloids. We establish a thermodynamic law for dilute suspensions of interacting active particles in the form of a remarkable direct link between their dynamics and thermodynamics: The rate at which irreversibility is built up in the non-equilibrium steady state is a state function of the thermodynamic system parameters, namely the number of particles, the temperature and, as a distinctive characteristic of active matter, the swim pressure. Like in the famous fluctuation theorems of stochastic thermodynamics, irreversibility is a dynamical measure that quantifies the amount by which microscopic particle trajectories break time-reversal symmetry, without reference to the typically unobservable processes underlying self-propulsion. We derive the result for the paradigmatic model of active Ornstein-Uhlenbeck particles with short-ranged repulsive interactions. Based on numerical simulations and heuristic arguments, we furthermore present a refined relation whose validity extends from the dilute into the phase-separated (MIPS) regime. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2308_03625 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Thermodynamic nature of irreversibility in active matter Dabelow, Lennart Eichhorn, Ralf Statistical Mechanics Soft Condensed Matter Active matter describes systems whose constituents convert energy from their surroundings into directed motion, such as bacteria or catalytic colloids. We establish a thermodynamic law for dilute suspensions of interacting active particles in the form of a remarkable direct link between their dynamics and thermodynamics: The rate at which irreversibility is built up in the non-equilibrium steady state is a state function of the thermodynamic system parameters, namely the number of particles, the temperature and, as a distinctive characteristic of active matter, the swim pressure. Like in the famous fluctuation theorems of stochastic thermodynamics, irreversibility is a dynamical measure that quantifies the amount by which microscopic particle trajectories break time-reversal symmetry, without reference to the typically unobservable processes underlying self-propulsion. We derive the result for the paradigmatic model of active Ornstein-Uhlenbeck particles with short-ranged repulsive interactions. Based on numerical simulations and heuristic arguments, we furthermore present a refined relation whose validity extends from the dilute into the phase-separated (MIPS) regime. |
| title | Thermodynamic nature of irreversibility in active matter |
| topic | Statistical Mechanics Soft Condensed Matter |
| url | https://arxiv.org/abs/2308.03625 |