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dc.contributor.authorLepri, Stefano
dc.contributor.authorDelfini, L.
dc.contributor.authorLivi, Roberto
dc.contributor.authorBasile, Giada
dc.contributor.authorOlla, Stefano
dc.subjectEnergy transferen
dc.subjectTransport theoryen
dc.titleAnomalous transport and relaxation in classical one-dimensional modelsen
dc.typeArticle accepté pour publication ou publié
dc.contributor.editoruniversityotherLaboratoire de Physique Théorique - IRSAMC (LPT) CNRS : UMR5152 – Université Paul Sabatier - Toulouse III;France
dc.contributor.editoruniversityotherCNR - ISC;France
dc.contributor.editoruniversityotherWeierstrass Institut for Applied Mathematics and Stochastics (WIAS) WIAS;Allemagne
dc.description.abstractenAfter reviewing the main features of anomalous energy transport in 1D systems, we report simulations performed with chains of noisy anharmonic oscillators. The stochastic terms are added in such a way to conserve total energy and momentum, thus keeping the basic hydrodynamic features of these models. The addition of this "conservative noise" allows to obtain a more efficient estimate of the power-law divergence of heat conductivity $\kappa(L) \sim L^{\alpha}$ in the limit of small noise and large system size L. By comparing the numerical results with rigorous predictions obtained for the harmonic chain, we show how finite-size and time effects can be effectively controlled. For low noise amplitudes, the $\alpha$ values are close to 1/3 for asymmetric potentials and to 0.4 for symmetric ones. These results support the previously conjectured two-universality-classes scenario.en
dc.relation.isversionofjnlnameEuropean Journal of Physics
dc.subject.ddclabelSciences connexes (physique, astrophysique)en

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