Bulletin of the American Physical Society
APS March Meeting 2019
Volume 64, Number 2
Monday–Friday, March 4–8, 2019; Boston, Massachusetts
Session V61: Physics and Hydrodynamics of Micro-swimmers' Suspensions
2:30 PM–5:30 PM,
Thursday, March 7, 2019
BCEC Room: 258B
Sponsoring Unit: GSOFT
Chair: Arnold Mathijssen, Stanford University
Abstract: V61.00010 : Non-Gaussian limit fluctuations in active swimmer suspensions
4:42 PM–5:18 PM
The non-Gaussian shape of the hydrodynamic fluctuations in active swimmer suspensions obeys the analytic theory concomitantly with independently determined parameters such as the strength of force generations and the concentration of swimmers. Time evolution of the distributions collapsed to a single master curve, except for their extreme tails, for which our theory presents a qualitative explanation. Investigations thereof and the complete agreement with theoretical predictions revealed broad applicability of the formula to fluctuations in active systems .
Fluctuations show up differently in different spatial dimensions since dimensionality affects the spatial correlations of fields and the population of field sources as a function of system size. Swimmers that resist to sedimentation or ordinary force-dipolar swimmers confined in 2D generate 1/r-decaying fields that are long-ranged in the sense that there is no thermodynamic limit. If time permitted, I will discuss the implication of our study for the dimensionality dependence of active fluctuations.
 T. Kurihara, et al. and D. Mizuno, Physical Review E. 95, 030601 (2017).
 I. Zaid and D. Mizuno T. Kurihara, Physical Review Letters 117, 030602 (2016).
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