Large scale behavior of semiflexible heteropolymers
Annales de l'I.H.P. Probabilités et statistiques, Tome 46 (2010) no. 1, pp. 97-118.

On considère un modèle discret pour un polymère semi-flexible et hétérogène. Le bruit thermique et le caractère hétérogène du polymère (le désordre) sont modélisés en termes de rotations aléatoires. Nous nous concentrons sur le régime de désordre gélé, c'est-à-dire, l'analyse est effectuée pour une réalisation fixée du désordre. Les modèles semi-flexibles diffèrent sensiblement des marches aléatoires à petite échelle, mais à grande échelle un comportement brownien apparaît. En exploitant des techniques de calcul tensoriel et d'analyse de Fourier non-commutative, nous établissons le caractère brownien du modèle à grande échelle et nous obtenons une expression pour la constante de diffusion. Nous donnons aussi des conditions qui entraînent des propriétés quantitatives de mélange.

We consider a general discrete model for heterogeneous semiflexible polymer chains. Both the thermal noise and the inhomogeneous character of the chain (the disorder) are modeled in terms of random rotations. We focus on the quenched regime, i.e., the analysis is performed for a given realization of the disorder. Semiflexible models differ substantially from random walks on short scales, but on large scales a brownian behavior emerges. By exploiting techniques from tensor analysis and non-commutative Fourier analysis, we establish the brownian character of the model on large scales and we obtain an expression for the diffusion constant. We moreover give conditions yielding quantitative mixing properties.

DOI : 10.1214/08-AIHP310
Classification : 60K37, 82B44, 60F05, 43A75
Mots-clés : heteropolymer, semiflexible chain, disorder, persistence length, large scale limit, tensor analysis, non-commutative Fourier analysis 
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Caravenna, Francesco; Giacomin, Giambattista; Gubinelli, Massimiliano. Large scale behavior of semiflexible heteropolymers. Annales de l'I.H.P. Probabilités et statistiques, Tome 46 (2010) no. 1, pp. 97-118. doi : 10.1214/08-AIHP310. http://archive.numdam.org/articles/10.1214/08-AIHP310/

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