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Nonequilibrium hyperuniform states in active turbulence

R. Backofen,Abdelrahman Altawil,M. Salvalaglio,Axel Voigt

Published 2023 in Proceedings of the National Academy of Sciences of the United States of America

ABSTRACT

Significance Hyperuniform systems, in which density fluctuations are anomalously suppressed at large spatial scales, have been identified in various fields and often lead to advantageous properties in technological applications. We apply this concept to active fluids using continuum modeling and connect hyperuniformity and active turbulence. This not only is of theoretical interest in the context of nonequilibrium physics, this connection also allows for speculating on a biological interpretation: at low activities, active fluids, such as bacterial suspensions, exhibit optimal properties for resting states, such as isotropy and robustness against defects or perturbations, whereas for larger activities, enhanced signatures of Levy walks can be related to optimal strategies for evasion and foraging.

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