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Molecular Diffusion in Plasma Membranes of Primary Lymphocytes Measured by Fluorescence Correlation Spectroscopy

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Fluctuation-response relations for nonequilibrium diffusions with memory.

C Maes¹, S Safaverdi, P Visco

¹Instituut voor Theoretische Fysica, KU Leuven-Celestijnenlaan 200D, B-3001 Leuven, Belgium.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

|March 19, 2013

Summary

This summary is machine-generated.

This study extends the fluctuation-dissipation theorem to nonequilibrium Langevin systems with memory. It reveals how memory effects modify the Sutherland-Einstein relation, impacting diffusion and mobility under strong interactions.

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Area of Science:

Statistical Mechanics
Soft Matter Physics
Nonlinear Dynamics

Background:

Brownian particles interacting with their medium exhibit memory effects influencing their dynamics.
The fluctuation-dissipation theorem (FDT) traditionally applies to equilibrium systems.
Extending FDT to nonequilibrium systems with memory is crucial for understanding complex particle behavior.

Purpose of the Study:

To generalize the fluctuation-dissipation theorem for nonequilibrium Langevin systems incorporating memory effects.
To investigate the impact of strong memory on the Sutherland-Einstein relation.
To analyze nonequilibrium corrections to diffusion and mobility.

Main Methods:

Theoretical extension of the fluctuation-dissipation theorem.
Analysis of Brownian particle dynamics in a medium with memory.
Derivation of modified Sutherland-Einstein relations.

Main Results:

The generalized FDT accounts for memory effects in nonequilibrium systems.
Strong memory significantly alters the relationship between diffusion and mobility.
Nonequilibrium corrections reveal time correlations between dynamical activity, particle velocity, and driving forces.

Conclusions:

Memory effects are critical in understanding nonequilibrium Brownian dynamics.
The generalized FDT provides a framework for analyzing systems with strong interactions.
This work offers insights into correlations between forces and displacements in complex media.