Abstract
It is common practice to approximate a weakly nonlinear wave equation through a kinetic transport equation, thus raising the issue of controlling the validity of the kinetic limit for a suitable choice of the random initial data. While for the general case a proof of the kinetic limit remains open, we report on first progress. As wave equation we consider the nonlinear Schrödinger equation discretized on a hypercubic lattice. Since this is a Hamiltonian system, a natural choice of random initial data is distributing them according to the corresponding Gibbs measure with a chemical potential chosen so that the Gibbs field has exponential mixing. The solution ψ t (x) of the nonlinear Schrödinger equation yields then a stochastic process stationary in x∈ℤd and t∈ℝ. If λ denotes the strength of the nonlinearity, we prove that the space-time covariance of ψ t (x) has a limit as λ→0 for t=λ −2 τ, with τ fixed and |τ| sufficiently small. The limit agrees with the prediction from kinetic theory.
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Lukkarinen, J., Spohn, H. Weakly nonlinear Schrödinger equation with random initial data. Invent. math. 183, 79–188 (2011). https://doi.org/10.1007/s00222-010-0276-5
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DOI: https://doi.org/10.1007/s00222-010-0276-5