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Título del libro: Quantitative Models For Microscopic To Macroscopic Biological Macromolecules And Tissues
Título del capítulo: The non-equilibrium nature of active motion

Autores UNAM:
FRANCISCO JAVIER SEVILLA PEREZ;
Autores externos:

Idioma:
Inglés
Año de publicación:
2018
Palabras clave:

Active motion; Confined active particles; Fluctuation-dissipation theorem; Generalized langevin equation; Persistent brownian motion


Resumen:

In this contribution chapter, the non-equilibrium nature of active motion is explored in the framework of the Generalized Langevin Equation. The persistence effects that distinguish active motion, observed in a variety of biological organisms and man-made colloidal particles, from the passive one, are put in correspondence with the memory function that characterizes the retarded dissipative effects in the equation. The non-equilibrium aspects of this approach rely on the relaxation of the fluctuation-dissipation relation, that couples the memory function with the autocorrelation function of the fluctuating force in order to describe the equilibrium. In the case of freely diffusing active particles, the Fokker-Planck equation is derived and an effective temperature can be identified if the total overlap between the deterministic solutions of the Generalized Langevin Equation at two times, weighted by the noise correlation function, exists and is finite. Active motion confined by the harmonic, external potential is analyzed on the same framework leading to analogous conclusions. © Springer International Publishing AG 2018. All rights are reserved.


Entidades citadas de la UNAM: