Abstract
We study weakly nonlinear spatially localized solutions of a Fermi-Pasta-Ulam model describing a unidimensional chain of particles interacting with a number of neighbors that can vary from site to site. The interaction potential contains quadratic and quartic terms, and is derived from a nonlinear elastic network model proposed by Juanico et al. [1]. The FPU model can be also derived for arbitrary dimensions, under a small angular displacement assumption. The variable interaction range is a consequence of the spatial inhomogeneity in the equilibrium particle distribution. We here study some simple one-dimensional examples with only a few, well defined agglomeration regions. These agglomerations are seen to lead to spatially localized linear modes and gaps in the linear spectrum, which in turn imply a normal form that has spatially localized periodic orbits.
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Martínez-Farías, F., Panayotaros, P. & Olvera, A. Weakly nonlinear localization for a 1-D FPU chain with clustering zones. Eur. Phys. J. Spec. Top. 223, 2943–2952 (2014). https://doi.org/10.1140/epjst/e2014-02307-7
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DOI: https://doi.org/10.1140/epjst/e2014-02307-7