Thermal and active fluctuations of a compressible bilayer vesicle

T. V. Sachin Krishnan, Kento Yasuda, Ryuichi Okamoto, Shigeyuki Komura

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


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.

Original languageEnglish
Article number175101
JournalJournal of Physics Condensed Matter
Issue number17
Publication statusPublished - Apr 5 2018


  • active fluctuations
  • hydrodynamics
  • microrheology
  • thermal fluctuations
  • vesicles

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics


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