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Interactions induites par un environnement fluctuant

Vincent Démery 1
1 PhyStat - Physique Statistique des Systèmes Complexes (LPT)
LPT - Laboratoire de Physique Théorique
Abstract : The interaction between two objects is, most of the time, carried by their environ- ment. The properties of the environment allow one to compute the features of the interaction felt between the objects. This computation is presented in this thesis in two different situa- tions. The first part deals with the effect of a fluctuating environment on a moving object. The mean force is computed for an object moving at constant speed and coupled linearly or quadratically to its environment. In the last case, the drag force is only due to fluctua- tions and is thus a Casimir drag. The diffusion coefficient is then computed for a weak linear coupling, generalising known results for diffusion in a quenched potential. The computations are valid for a very general form of environment, and can be applied to proteins diffusing in fluctuating lipid membranes. The second part is about systems of ions between two charged plates. The first studied system is a one-dimensionnal model of ionic liquid on a lattice for which the pressure and the charge density can be computed exactly. The second system contains polarizable ions; the effects of polarisability on the pressure and the charge density are looked at in two limiting cases.
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Contributor : Vincent Démery <>
Submitted on : Monday, July 2, 2012 - 10:07:10 PM
Last modification on : Thursday, February 27, 2020 - 4:40:05 PM
Long-term archiving on: : Thursday, December 15, 2016 - 7:40:59 PM


  • HAL Id : tel-00713393, version 1


Vincent Démery. Interactions induites par un environnement fluctuant. Mécanique statistique [cond-mat.stat-mech]. Université Paul Sabatier - Toulouse III, 2012. Français. ⟨tel-00713393⟩



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