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Dispersive shock waves in periodic lattices

Su Yang and Sathyanarayanan Chandramouli

P. G. Kevrekidis

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Phys. Rev. E 113, 044204 – Published 10 April, 2026

DOI: https://doi.org/10.1103/sppv-dr5c

Abstract

We introduce and systematically investigate the generation of dispersive shock waves, which arise naturally in physical settings such as optical waveguide arrays and superfluids confined within optical lattices. The underlying physically relevant model is a nonlinear Schrödinger (NLS) equation with a periodic potential. We consider the evolution of piecewise smooth initial data composed of two distinct nonlinear periodic eigenmodes. To begin interpreting the resulting wave dynamics, we employ the tight-binding approximation, reducing the continuous system to a discrete NLS (DNLS) model with piecewise constant initial data (i.e., a Riemann problem), where each constant state represents a discrete Floquet-Bloch mode at the continuum model level. The resulting tight-binding approximation is shown to display higher fidelity for deeper periodic potentials. This reduced DNLS model effectively models the dynamics at the minima of the periodic potential of the original continuum NLS. Within such a single-band DNLS framework, we apply tools from Whitham modulation theory and long-wave quasicontinuum reductions to uncover and analyze a rich spectrum of nonconvex, discrete dispersive hydrodynamic phenomena, comparing the resulting phenomenology with that of the periodic-potential-bearing continuum model.

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Phys. Rev. E 113, 044204– Published 10 April, 2026
  • Received 29 November 2025
  • Accepted 16 March 2026
Article part of CHORUS
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