http://www.cnr.it/ontology/cnr/individuo/prodotto/ID167671
Anomalous transport and relaxation in classical one-dimensional models (Articolo in rivista)
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- Anomalous transport and relaxation in classical one-dimensional models (Articolo in rivista) (literal)
- Anno
- 2007-01-01T00:00:00+01:00 (literal)
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- Basile G.; Delfini L.; Lepri S.; Livi R.; Olla S.; Politi A. (literal)
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- ISI Web of Science (WOS) (literal)
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- Univ Florence, Dipartimento Matemat, I-50134 Florence, Italy; CNR, Ist Sistemi Complessi, I-50019 Sesto Fiorentino, Italy; Dipartimento Fis, I-50019 Sesto Fiorentino, Italy; Univ Paris 09, CNRS, UMR 7534, Ceremade, F-75775 Paris 16, France; Ist Nazl Fis Nucl, I-50125 Florence, Italy; Ist Nazl Fis Mat, Florence, Italy (literal)
- Titolo
- Anomalous transport and relaxation in classical one-dimensional models (literal)
- Abstract
- After 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 k(L) similar to 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 a 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. (literal)
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