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Application of weak turbulence theory to FPU model

Pages: 482 - 491, Issue Special, July 2003

 Abstract        Full Text (190.8K)              

Peter R. Kramer - Department of Mathematical Sciences, Rensselaer Polytechnic Institute, 301 Amos Eaton Hall, 110 8th Street, Troy, NY 12180, United States (email)
Joseph A. Biello - Department of Mathematical Sciences, Rensselaer Polytechnic Institute, 301 Amos Eaton Hall, 110 8th Street, Troy, NY 12180, United States (email)
Yuri Lvov - Department of Mathematical Sciences, Rensselaer Polytechnic Institute, 301 Amos Eaton Hall, 110 8th Street, Troy, NY 12180, United States (email)

Abstract: The foundations of weak turbulence theory is explored through its application to the (alpha) Fermi-Pasta-Ulam (FPU) model, a simple weakly nonlinear dispersive system. A direct application of the standard kinetic equations would miss interesting dynamics of the energy transfer process starting from a large-scale excitation. This failure is traced to an enforcement of the exact resonance condition, whereas mathematically the resonance should be broadened due to the energy transfer happening on large but finite time scales. By allowing for the broadened resonance, a modified three-wave kinetic equation is derived for the FPU model. This kinetic equation produces some correct scaling predictions about the statistical dynamics of the FPU model, but does not model accurately the detailed evolution of the energy spectrum. The reason for the failure seems not to be one of the previously clarified reasons for breakdown in the weak turbulence theory.

Keywords:  Fermi-Pasta-Ulam model, weak turbulence, resonance broadening.
Mathematics Subject Classification:  Primary: 41A60,82C05,82C28, Secondary: 34E13, 37K60.

Received: September 2002;      Revised: April 2003;      Published: April 2003.