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

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 Schrodinger type-quasinormal forms-whose nonlocal dynamics determines the local behavior of solutions to the original problem, as t & RARR;& INFIN;. 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.

Automated summary

This paper explores irregular solutions of the spatially-distributed Fermi-Pasta-Ulam (FPU) equation, constructing families of special nonlinear systems known as Schrodinger type-quasinormal forms. These systems determine the local behavior of solutions to the original problem as t approaches infinity. The paper also discusses the asymptotics of the main solution of the FPU equation and the interaction of waves moving in opposite directions, as well as the complications arising from perturbing the number of elements in a chain.