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The direct and inverse scattering problem for the semilinear Schrödinger equation

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Abstract

We study the direct and inverse scattering problem for the semilinear Schrödinger equation \(\Delta u+a(x,u)+k^2u=0\) in \(\mathbb {R}^d\). We show well-posedness in the direct problem for small solutions based on the Banach fixed point theorem, and the solution has the certain asymptotic behavior at infinity. We also show the inverse problem that the semilinear function a(x, z) is uniquely determined from the scattering amplitude. The idea is the linearization that by using sources with several parameters we differentiate the nonlinear equation with respect to these parameter in order to get the linear one.

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Acknowledgements

The author thanks to Professor Mikko Salo, who supports him in this study, and gives him many comments to improve this paper.

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  1. Graduate School of Mathematics, Nagoya University, Nagoya, Japan

    Takashi Furuya

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  1. Takashi Furuya
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Correspondence to Takashi Furuya.

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Furuya, T. The direct and inverse scattering problem for the semilinear Schrödinger equation. Nonlinear Differ. Equ. Appl. 27, 24 (2020). https://doi.org/10.1007/s00030-020-00627-x

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