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Hydrodynamic equations for the Ablowitz-Ladik discretization of the nonlinear Schroedinger equation

Ablowitz and Ladik discovered a discretization which preserves the integrability of the nonlinear Schroedinger equation in one dimension. We compute the generalized free energy of this model and determine the GGE averaged fields and currents. They are linked to the mean-field circular unitary matrix ensemble (CUE). The resulting hydrodynamic equations follow the pattern already known from other integrable many-body systems. Studied is also the discretized modified Korteweg-de-Vries equation which turns out to be related to the beta Jacobi log gas.

preprint2021arXivOpen access
Herbert Spohn
cond-mat.stat-mechmath-phmath.MP
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Herbert Spohn

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