Thermal and active fluctuations of a compressible bilayer vesicle

We discuss thermal and active fluctuations of a compressible bilayer vesicle by using the results of hydrodynamic theory for vesicles. Coupled Langevin equations for the membrane deformation and the density fields are employed to calculate the power spectral density matrix of membrane fluctuations....

Full description

Saved in:
Bibliographic Details
Published in:Journal of physics. Condensed matter 2018-05, Vol.30 (17), p.175101-175101
Main Authors: Sachin Krishnan, T V, Yasuda, Kento, Okamoto, Ryuichi, Komura, Shigeyuki
Format: Article
Language:English
Subjects:
active fluctuations
hydrodynamics
microrheology
thermal fluctuations
vesicles
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We discuss thermal and active fluctuations of a compressible bilayer vesicle by using the results of hydrodynamic theory for vesicles. Coupled Langevin equations for the membrane deformation and the density fields are employed to calculate the power spectral density matrix of membrane fluctuations. Thermal contribution is obtained by means of the fluctuation dissipation theorem, whereas active contribution is calculated from exponentially decaying time correlation functions of active random forces. We obtain the total power spectral density as a sum of thermal and active contributions. An apparent response function is further calculated in order to compare with the recent microrheology experiment on red blood cells. An enhanced response is predicted in the low-frequency regime for non-thermal active fluctuations.
ISSN:0953-8984
1361-648X
DOI:10.1088/1361-648X/aab6c7