Abstract
We study time-periodic and spatially localised solutions (breathers) in general infinite conservative and dissipative nonlinear Klein–Gordon lattices. First, in the time-reversible (conservative) case, we give a concise proof of the existence of breathers not using the concept of the anticontinuous limit. The existence problem is converted into an operator equation for time-reversal initial conditions generating breather solutions. A nontrivial solution of this operator equation is established facilitating Schauder’s fixed point theorem. Afterwards, we prove the existence and uniqueness of breather solutions in damped and forced infinite nonlinear Klein–Gordon lattice systems utilising the contraction map** principle.
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Hennig, D. Breather solutions in conservative and dissipative nonlinear Klein–Gordon lattices. J. Fixed Point Theory Appl. 26, 18 (2024). https://doi.org/10.1007/s11784-024-01106-x
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DOI: https://doi.org/10.1007/s11784-024-01106-x