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Sub-Power Law Decay of the Wave Packet Maximum in Disordered Anharmonic Chains (2502.02344v1)

Published 4 Feb 2025 in math-ph, math.DS, and math.MP

Abstract: We show that the peak of an initially localized wave packet in one-dimensional nonlinear disordered chains decays more slowly than any power law of time. The systems under investigation are Klein-Gordon and nonlinear disordered Schr\"odinger-type chains, characterized by a harmonic onsite disordered potential and quartic nearest-neighbor coupling. Our results apply in the long-time limit, hold almost surely, and are valid for arbitrary finite energy values.

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