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Title: Equilibration and Universal Heat Conduction in Fermi-Pasta-Ulam Chains
Authors: Mai, Trieu
Dhar, Abhishek
Narayan, Onuttom
Issue Date: 4-May-2007
Publisher: American Physical Society
Citation: Physical Review Letters, 2007, Vol.98, p184301
Abstract: It is shown numerically that for Fermi-Pasta-Ulam (FPU) chains with alternating masses and heat baths at slightly different temperatures at the ends, the local temperature (LT) on small scales behaves paradoxically in steady state. This expands the long established problem of equilibration of FPU chains. A well-behaved LT appears to be achieved for equal mass chains; the thermal conductivity is shown to diverge with chain length N as N1/3, relevant for the much debated question of the universality of one-dimensional heat conduction. The reason why earlier simulations have obtained systematically higher exponents is explained.
Description: Open Access. Includes a reply by the authors to the comment by Luca Delfini et al..
ISSN: 0031-9007
1079-7114 (online)
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Copyright: 2007 The American Physical Society
Appears in Collections:Research Papers (TP)

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