New Irregular Solutions in the Spatially Distributed Fermi–Pasta–Ulam Problem

Sergey Kashchenko and Anna Tolbey
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Sergey Kashchenko: Regional Scientific and Educational Mathematical Center, Yaroslavl State University, 150003 Yaroslavl, Russia
Anna Tolbey: Regional Scientific and Educational Mathematical Center, Yaroslavl State University, 150003 Yaroslavl, Russia

Mathematics, 2021, vol. 9, issue 22, 1-10

Abstract: For the spatially-distributed Fermi–Pasta–Ulam (FPU) equation, irregular solutions are studied that contain components rapidly oscillating in the spatial variable, with different asymptotically large modes. The main result of this paper is the construction of families of special nonlinear systems of the Schrödinger type—quasinormal forms—whose nonlocal dynamics determines the local behavior of solutions to the original problem, as t → ∞ . On their basis, results are obtained on the asymptotics in the main solution of the FPU equation and on the interaction of waves moving in opposite directions. The problem of “perturbing” the number of N elements of a chain is considered. In this case, instead of the differential operator, with respect to one spatial variable, a special differential operator, with respect to two spatial variables appears. This leads to a complication of the structure of an irregular solution.

Keywords: Fermi–Pasta–Ulam problem; quasinormal forms; asymptotics; special distributed chains (search for similar items in EconPapers)
JEL-codes: C (search for similar items in EconPapers)
Date: 2021
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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