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Joshi, Chaitanya; Ray, Sattvic; Lemma, Linnea M; Varghese, Minu; Sharp, Graham; Dogic, Zvonimir; Baskaran, Aparna; Hagan, Michael F
Physical review letters, 12/2022, Letnik: 129, Številka: 25Journal Article
Active nematics can be modeled using phenomenological continuum theories that account for the dynamics of the nematic director and fluid velocity through partial differential equations (PDEs). While these models provide a statistical description of the experiments, the relevant terms in the PDEs and their parameters are usually identified indirectly. We adapt a recently developed method to automatically identify optimal continuum models for active nematics directly from spatiotemporal data, via sparse regression of the coarse-grained fields onto generic low order PDEs. After extensive benchmarking, we apply the method to experiments with microtubule-based active nematics, finding a surprisingly minimal description of the system. Our approach can be generalized to gain insights into active gels, microswimmers, and diverse other experimental active matter systems.
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