WKB analysis of non-elliptic nonlinear Schrodinger equations
Abstract
We justify the WKB analysis for generalized nonlinear Schr\"odinger equations (NLS), including the hyperbolic NLS and the Davey-Stewartson II system. Since the leading order system in this analysis is not hyperbolic, we work with analytic regularity, with a radius of analyticity decaying with time, in order to obtain better energy estimates. This provides qualitative information regarding equations for which global well-posedness in Sobolev spaces is widely open.
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