Backofen Rainer, Altawil Abdelrahman Y A, Salvalaglio Marco, Voigt Axel
Institute of Scientific Computing, Faculty of Mathematics, Technische Universität Dresden, Dresden 01062.
Dresden Centre for Computational Materials Science, Technische Universität Dresden, 01062 Dresden, Germany.
Proc Natl Acad Sci U S A. 2024 Jun 11;121(24):e2320719121. doi: 10.1073/pnas.2320719121. Epub 2024 Jun 7.
We demonstrate that the complex spatiotemporal structure in active fluids can feature characteristics of hyperuniformity. Using a hydrodynamic model, we show that the transition from hyperuniformity to nonhyperuniformity and antihyperuniformity depends on the strength of active forcing and can be related to features of active turbulence without and with scaling characteristics of inertial turbulence. Combined with identified signatures of Levy walks and nonuniversal diffusion in these systems, this allows for a biological interpretation and the speculation of nonequilibrium hyperuniform states in active fluids as optimal states with respect to robustness and strategies of evasion and foraging.
我们证明了活性流体中的复杂时空结构可以具有超均匀性特征。通过一个流体动力学模型，我们表明从超均匀性到非超均匀性和反超均匀性的转变取决于活性驱动的强度，并且可以与无惯性湍流缩放特征以及有惯性湍流缩放特征的活性湍流特征相关。结合在这些系统中识别出的列维行走和非普适扩散的特征，这使得我们能够对活性流体中的非平衡超均匀态进行生物学解释，并推测其为关于稳健性以及逃避和觅食策略的最优状态。
