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https://pubmed.ncbi.nlm.nih.gov/38115495
This study identifies a new type of quasi-breather solution in a nonlinear Schrödinger equation with nonlocal derivatives in a 2D periodic domain, which dominates at low nonlinearity levels before breaking down into Rayleigh-Jeans spectra with increased nonlinearity, and discusses its behavior in the context of Kolmogorov-Arnold-Moser theory.