Thermodynamic constraints and exact scaling exponents of flocking matter
arXiv:2405.02283 · doi:10.1103/PhysRevE.110.054108
Abstract
We use advances in the formalism of boost agnostic passive fluids to constrain transport in polar active fluids, which are subsequently described by the Toner-Tu equations. Acknowledging that the system fundamentally breaks boost symmetry we compel what were previously entirely phenomenological parameters in the Toner-Tu model to satisfy precise relationships among themselves. Consequently, we propose a thermodynamic argument to determine the exact scalings of the transport coefficients under dynamical renormalisation group flow. These scalings perfectly agree with the results of recent state-of-the-art numerical simulation and experiments
5.5 + 4.5 pages, no figures; v2: revised, 8+2 pages, no figures, new discussion on entropy constraints
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