Skip to Main content Skip to Navigation
Journal articles

Enhanced fluctuations of interacting particles confined in a box

Abstract : We study the position fluctuations of interacting particles aligned in a finite cell that avoid any crossing in equilibrium with a thermal bath. The focus is put on the influence of the confining force directed along the cell length. We show that the system may be modeled as a 1D chain of particles with identical masses, linked with linear springs of varying spring constants. The confining force may be accounted for by linear springs linked to the walls. When the confining force range is increased toward the inside of the chain, a paradoxical behavior is exhibited. The outermost particles fluctuations are enhanced, whereas those of the inner particles are reduced. A minimum of fluctuations is observed at a distance of the cell extremities that scales linearly with the confining force range. Those features are in very good agreement with the model. Moreover, the simulations exhibit an asymmetry in their fluctuations which is an anharmonic effect. It is characterized by the measurement of the skewness, which is found to be strictly positive for the outer particles when the confining force is short ranged.
Document type :
Journal articles
Complete list of metadata

Cited literature [15 references]  Display  Hide  Download
Contributor : Christophe Coste Connect in order to contact the contributor
Submitted on : Tuesday, November 29, 2016 - 12:06:49 PM
Last modification on : Saturday, October 3, 2020 - 3:57:40 AM
Long-term archiving on: : Tuesday, March 21, 2017 - 3:42:59 AM


Publisher files allowed on an open archive




Jean-Baptiste Delfau, Christophe Coste, Michel Saint-Jean. Enhanced fluctuations of interacting particles confined in a box. Physical Review E : Statistical, Nonlinear, and Soft Matter Physics, American Physical Society, 2012, 85, pp.41137 - 41137. ⟨10.1103/PhysRevE.85.041137⟩. ⟨hal-01404835⟩



Les métriques sont temporairement indisponibles