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Construction of breather solutions for nonlinear Klein-Gordon equations on periodic metric graphs

. JOURNAL OF DIFFERENTIAL EQUATIONS, 268 (6): 2491-2509 (March 2020)
DOI: 10.1016/j.jde.2019.09.035

Abstract

The purpose of this paper is to construct small-amplitude breather solutions for a nonlinear Klein-Gordon equation posed on a periodic metric graph via spatial dynamics and center manifold reduction. The major difficulty occurs from the irregularity of the solutions. The persistence of the approximately constructed pulse solutions under higher order perturbations is obtained by symmetry and reversibility arguments. (C) 2019 Elsevier Inc. All rights reserved.

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