Hydrodynamic fluctuations and instabilities in ordered suspensions of self-propelled particles

被引：715

作者：

Simha, RA ^{[1
]}

Ramaswamy, S ^{[1
]}

机构：

[1] Indian Inst Sci, Dept Phys, Ctr Condensed Matter Theory, Bangalore 560012, Karnataka, India

来源：

PHYSICAL REVIEW LETTERS | 2002年 / 89卷 / 05期

关键词：

D O I：

10.1103/PhysRevLett.89.058101

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We construct the hydrodynamic equations for suspensions of self-propelled particles (SPPs) with spontaneous orientational order, and make a number of striking, testable predictions: (i) Nematic SPP suspensions are always absolutely unstable at long wavelengths. (ii) SPP suspensions support novel propagating modes at long wavelengths, coupling orientation, flow, and concentration. (iii) In a wave number regime accessible only in low Reynolds number systems such as bacteria, polar-ordered suspensions are invariably convectively unstable. (iv) The variance in the number N of particles, divided by the mean <N>, diverges as <N>(2/3) in polar-ordered SPP suspensions.

引用

页数：4

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