Studies of thermal conductivity in Fermi-Pasta-Ulam-like lattices (Articolo in rivista)

Type
Label
  • Studies of thermal conductivity in Fermi-Pasta-Ulam-like lattices (Articolo in rivista) (literal)
Anno
  • 2005-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1063/1.1854281 (literal)
Alternative label
  • Lepri S. (1); Livi R. (2); Politi A. (1); (2005)
    Studies of thermal conductivity in Fermi-Pasta-Ulam-like lattices
    in Chaos (Woodbury N.Y.)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Lepri S. (1); Livi R. (2); Politi A. (1); (literal)
Pagina inizio
  • 015118 (literal)
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  • 15 (literal)
Rivista
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  • American Institute of Physics (AIP). Focus issue: The \"Fermi-Pasta-Ulam\" problem - the first 50 years. (literal)
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  • 9 (literal)
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  • 1 (literal)
Note
  • ISI Web of Science (WOS) (literal)
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  • 1) Istituto Nazionale di Ottica Applicata, largo E. Fermi 6, I-50125 Firenze, Italy; Istituto dei Sistemi Complessi, Consiglio Nazionale delle Ricerche, Sez. Territoriale di Firenze, largo E. Fermi 6, I-50125 Firenze, Italy; and Istituto Nazionale per la Fisica della Materia-UdR Firenze, via G. Sansone 1, I-50019 Sesto Fiorentino, Italy; 2) Dipartimento di Fisica, via G. Sansone 1, I-50019 Sesto Fiorentino, Italy and Istituto Nazionale per la Fisica della Materia-UdR Firenze, via G. Sansone 1, I-50019 Sesto Fiorentino, Italy; (literal)
Titolo
  • Studies of thermal conductivity in Fermi-Pasta-Ulam-like lattices (literal)
Abstract
  • The pioneering computer simulations of the energy relaxation mechanisms performed by Fermi, Pasta, and Ulam (FPU) can be considered as the first attempt of understanding energy relaxation and thus heat conduction in lattices of nonlinear oscillators. In this paper we describe the most recent achievements about the divergence of heat conductivity with the system size in one-dimensional (1D) and two-dimensional FPU-like lattices. The anomalous behavior is particularly evident at low energies, where it is enhanced by the quasiharmonic character of the lattice dynamics. Remarkably, anomalies persist also in the strongly chaotic region where long-time tails develop in the current autocorrelation function. A modal analysis of the 1D case is also presented in order to gain further insight about the role played by boundary conditions. (literal)
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