Unique continuation for discrete nonlinear wave equations

Unique Continuation for Discrete Nonlinear Wave Equations

We establish unique continuation for various discrete nonlinear wave equations. For example, we show that if two solutions of the Toda lattice coincide for one lattice point in some arbitrarily small time interval, then they coincide everywhere. Moreover, we establish analogous results for the Toda, Kac–van Moerbeke, and Ablowitz–Ladik hierarchies. Although all these equations are integrable, t...

Unique Continuation for Stochastic Parabolic Equations

This paper is devoted to a study of the unique continuation property for stochastic parabolic equations. Due to the adapted nature of solutions in the stochastic situation, classical approaches to treat the the unique continuation problem for deterministic equations do not work. Our method is based on a suitable partial Holmgren coordinate transform and a stochastic version of Carleman-type est...

Pseudo-Transient Continuation for Nonsmooth Nonlinear Equations

Pseudo-transient continuation is a Newton-like iterative method for computing steady-state solutions of differential equations in cases where the initial data is far from a steady state. The iteration mimics a temporal integration scheme, with the time step being increased as steady state is approached. The iteration is an inexact Newton iteration in the terminal phase. In this paper we show ho...

Numerical Continuation for Nonlinear SchrÖdinger Equations

We discuss numerical methods for studying numerical solutions of N-coupled nonlinear Schrödinger equations (NCNLS), N = 2, 3. First, we discretize the equations by centered difference approximations. The chemical potentials and the coupling coefficient are treated as continuation parameters. We show how the predictor–corrector continuation method can be exploited to trace solution curves and su...

The Cauchy Problem for Wave Equations with Non Lipschitz Coefficients; Application to Continuation of Solutions of Some Nonlinear Wave Equations