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- W2765676883 abstract "The dynamics of single carrier wavepackets in nonlinear wave problems over periodic structures can be often formally approximated by the constant coefficient nonlinear Schrodinger equation (NLS) as an effective model for the wavepacket envelope. We provide a detailed proof of this approximation result for the Gross-Pitaevskii equation (GP) and a semilinear wave equation, both with periodic coefficients in $mathbb{N}ni d$ spatial dimensions and with cubic nonlinearities. The proof is carried out in Bloch expansion variables with estimates in an $L^1$-type norm, which translates to an estimate of the supremum norm of the error. The regularity required from the periodic coefficients in order to ensure a small residual and a small error is discussed. We also present a numerical example in two spatial dimensions confirming the approximation result and presenting an approximate traveling solitary wave in the GP with periodic coefficients." @default.
- W2765676883 created "2017-11-10" @default.
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- W2765676883 date "2017-10-19" @default.
- W2765676883 modified "2023-09-27" @default.
- W2765676883 title "NLS approximation for wavepackets in periodic cubically nonlinear wave problems in $mathbb{R}^d$" @default.
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