Conditions on the Existence of Localized Excitations in Nonlinear Discrete Systems

Abstract

We use recent results that localized excitations in nonlinear Hamiltonian lattices can be viewed and described as multiple-frequency excitations. Their dynamics in phase space takes place on tori of corresponding dimension. For a one-dimensional Hamiltonian lattice with nearest neighbour interaction we transform the problem of solving the coupled differential equations of motion into a certain mapping $M_{l+1}=F(M_l,M_{l-1})$, where $M_l$ for every $l$ (lattice site) is a function defined on an infinite discrete space of the same dimension as the torus. We consider this mapping in the 'tails' of the localized excitation, i.e. for $l\to \pm \infty$. For a generic Hamiltonian lattice the thus linearized mapping is analyzed. We find conditions of existence of periodic (one-frequency) localized excitations as well as of multiple frequency excitations. The symmetries of the solutions are obtained. As a result we find that the existence of localized excitations can be a generic property of nonlinear Hamiltonian lattices in contrast to nonlinear Hamiltonian fields.

Phys. Rev. E in press, LaTeX file, 5 figures available upon request, 20 pages

References in corpus (2)

• Movability of Localized Excitations in Nonlinear Discrete Systems - a Separatrix Problem
• Localized Excitations in two-dimensional Hamiltonian Lattices

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