Direct verification of the fluctuation-dissipation relation in viscously coupled oscillators

被引：9

作者：

Paul, Shuvojit ^{[1
]}

Laskar, Abhrajit ^{[2
]}

Singh, Rajesh ^{[2
]}

Roy, Basudev ^{[3
]}

Adhikari, R. ^{[2
,4
]}

Banerjee, Ayan ^{[1
]}

机构：

[1] Indian Inst Sci Educ & Res, Kolkata 741246, Mohanpur, India

[2] Inst Math Sci HBNI, CIT Campus, Madras 600113, Tamil Nadu, India

[3] Indian Inst Technol, Dept Phys, Madras 600036, Tamil Nadu, India

[4] Univ Cambridge, Ctr Math Sci, DAMTP, Wilberforce Rd, Cambridge CB3 0WA, England

来源：

PHYSICAL REVIEW E | 2017年 / 96卷 / 05期

关键词：

HYDRODYNAMIC INTERACTIONS; THERMAL AGITATION; STRATONOVICH; SUSPENSION; CONDUCTORS; PARTICLES; ITO;

D O I：

10.1103/PhysRevE.96.050102

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

The fluctuation-dissipation relation, a central result in nonequilibrium statistical physics, relates equilibrium fluctuations in a system to its linear response to external forces. Here we provide a direct experimental verification of this relation for viscously coupled oscillators, as realized by a pair of optically trapped colloidal particles. A theoretical analysis, in which interactions mediated by slow viscous flow are represented by nonlocal friction tensors, matches experimental results and reveals a frequency maximum in the amplitude of the mutual response which is a sensitive function of the trap stiffnesses and the friction tensors. This allows for its location and width to be tuned and suggests the utility of the trap setup for accurate two-point microrheology.

引用

页数：5

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