Physics – Condensed Matter – Statistical Mechanics
Scientific paper
1998-09-07
Phys. Rev. E 58(6) 7165 (1998).
Physics
Condensed Matter
Statistical Mechanics
9 pag. 6 figs. To appear in Phys.Rev. E
Scientific paper
10.1103/PhysRevE.58.7165
The relaxation of Fourier modes of hamiltonian chains close to equilibrium is studied in the framework of a simple mode-coupling theory. Explicit estimates of the dependence of relevant time scales on the energy density (or temperature) and on the wavenumber of the initial excitation are given. They are in agreement with previous numerical findings on the approach to equilibrium and turn out to be also useful in the qualitative interpretation of them. The theory is compared with molecular dynamics results in the case of the quartic Fermi-Pasta-Ulam potential.
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