Entropy production rate in thermodynamically consistent flocks Article Swipe
Tal Agranov
,
Robert L. Jack
,
Michael E. Cates
,
Étienne Fodor
·
YOU?
·
· 2025
· Open Access
·
· DOI: https://doi.org/10.1088/1367-2630/ae0c2e
YOU?
·
· 2025
· Open Access
·
· DOI: https://doi.org/10.1088/1367-2630/ae0c2e
We study the entropy production rate (EPR) of aligning self-propelled particles which undergo a flocking transition into a state of polarized collective motion. In our thermodynamically consistent lattice model, individual self-propulsion is the exclusive source of irreversibility. We derive the fluctuating hydrodynamics for large system sizes using a controlled coarse-graining: our procedure entails an exact correspondence between the EPR evaluated at the hydrodynamic and particle-based levels. We reveal that EPR is maximal when the system adopts a homogeneous configuration, either apolar or polar, and reduced in the non-homogeneous state where a polar band travels in a apolar background due to strong spatial EPR modulations. By analyzing the latter we also show that asymmetric energetic exchanges occur at the trailing and leading edges, which we map into a thermodynamic cycle in density-polarization space. Finally, we demonstrate that the regime of weak self-propulsion features a singular scaling of EPR, and a non-analyticity of the travelling band profiles.
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- https://doi.org/10.1088/1367-2630/ae0c2e
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- References
- 76
- OpenAlex ID
- https://openalex.org/W4414536719
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Entropy production rate in thermodynamically consistent flocksWork title
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articleOpenAlex work type
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2025Year of publication
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2025-09-26Full publication date if available
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Tal Agranov, Robert L. Jack, Michael E. Cates, Étienne FodorList of authors in order
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