The nonlinear Schrödinger equation with combined power-type nonlinearities

Details The nonlinear Schrödinger equation with combined power-type nonlinearities The nonlinear Schrödinger equation with combined power-type nonlinearities

2005-11-03

arxiv.org/abs/math/0511070v1

Mathematics

Analysis of PDEs

Scientific paper

We undertake a comprehensive study of the nonlinear Schr\"odinger equation $$ i u_t +\Delta u = \lambda_1|u|^{p_1} u+ \lambda_2 |u|^{p_2} u, $$ where $u(t,x)$ is a complex-valued function in spacetime $\R_t\times\R^n_x$, $\lambda_1$ and $\lambda_2$ are nonzero real constants, and $00$ and $p_1=\frac{4}{n}$, $p_2=\frac{4}{n-2}$. The results at the endpoint $p_1 = \frac{4}{n}$ are conditional on a conjectured global existence and spacetime estimate for the $L^2_x$-critical nonlinear Schr\"odinger equation. As an off-shoot of our analysis, we also obtain a new, simpler proof of scattering in $H^1_x$ for solutions to the nonlinear Schr\"odinger equation $$ i u_t +\Delta u = |u|^{p} u, $$ with $\frac{4}{n}

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