Lower and upper estimates on the excitation threshold for breathers in DNLS lattices

Details Lower and upper estimates on the excitation threshold for breathers in DNLS lattices Lower and upper estimates on the excitation threshold for breathers in DNLS lattices

2009-03-17

arxiv.org/abs/0903.2964v1

Nonlinear Sciences

Pattern Formation and Solitons

10 pages, 3 figures

Scientific paper

We propose analytical lower and upper estimates on the excitation threshold for breathers (in the form of spatially localized and time periodic solutions) in DNLS lattices with power nonlinearity. The estimation depending explicitly on the lattice parameters, is derived by a combination of a comparison argument on appropriate lower bounds depending on the frequency of each solution with a simple and justified heuristic argument. The numerical studies verify that the analytical estimates can be of particular usefulness, as a simple analytical detection of the activation energy for breathers in DNLS lattices.

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