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H 1 Nonequilibrium statistical mechanics of harmonic networks

Auteurs : Pillet, Claude-Alain (Auteur de la Conférence)
CIRM (Editeur )

Résumé : We consider a general network of harmonic oscillators driven out of thermal equilibrium by coupling to several heat reservoirs at different temperatures. The action of the reservoirs is implemented by Langevin forces. Assuming the existence and uniqueness of the steady state of the resulting process, we construct a canonical entropy production functional $S(t)$ which satisfies the Gallavotti-Cohen fluctuation theorem. More precisely, we prove that cumulant generating function of $S(t)$ has a large-time limit $e(a)$ which is finite on a closed interval centered at $a=1/2$, infinite on its complement and satisfies the Gallavotti-Cohen symmetry $e(1-a)=e(a)$ for all $a$. It follows from well known results that $S(t)$ satisfies a global large deviation principle with a rate function $I(s)$ obeying the Gallavotti-Cohen fluctuation relation $I(-s)-I(s)=s$ for all $s$. We also consider perturbations of $S(t)$ by quadratic boundary terms and prove that they satisfy extended fluctuation relations, i.e., a global large deviation principle with a rate function that typically differs from $I(s)$ outside a finite interval. This applies to various physically relevant functionals and, in particular, to the heat dissipation rate of the network. Our approach relies on the properties of the maximal solution of a one-parameter family of algebraic matrix Ricatti equations. It turns out that the limiting cumulant generating functions of $S(t)$ and its perturbations can be computed in terms of spectral data of a Hamiltonian matrix depending on the harmonic potential of the network and the parameters of the Langevin reservoirs. This makes our approach well adapted to both analytical and numerical investigations. This is joint work with Vojkan Jaksic and Armen Shirikyan.

Codes MSC :
82C10 - Quantum dynamics and nonequilibrium statistical mechanics (general)
82C70 - Transport processes

 Informations sur la Vidéo Réalisateur : Hennenfent, Guillaume Langue : Anglais Date de publication : 21/01/16 Date de captation : 17/12/15 Collection : Research talks ; Mathematical Physics Format : MP4 Durée : 01:06:16 Domaine : Mathematical Physics Audience : Chercheurs ; Doctorants , Post - Doctorants Download : https://videos.cirm-math.fr/2015-12-17_Pillet.mp4 Informations sur la rencontre Nom de la rencontre : Semiclassical analysis and non-self-adjoint operators / Analyse semi-classique et opérateurs non-autoadjointsOrganisateurs de la rencontre : Fujiie, Setsuro ; Hérau, Frédéric ; Nicoleau, François ; Ramond, Thierry ; Viola, Joe ; Vu Ngoc, SanDates : 14/12/15 - 18/12/15 Année de la rencontre : 2015 URL Congrès : http://conferences.cirm-math.fr/1230.htmlCitation Data DOI : 10.24350/CIRM.V.18910803 Cite this video as: Pillet, Claude-Alain (2015). Nonequilibrium statistical mechanics of harmonic networks. CIRM. Audiovisual resource. doi:10.24350/CIRM.V.18910803 URI : http://dx.doi.org/10.24350/CIRM.V.18910803

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