Abstract
A sharp sufficient condition for global existence is obtained for the nonlinear Schrödinger equation
in the case σ=2/N. This condition is in terms of an exact stationary solution (nonlinear ground state) of (NLS). It is derived by solving a variational problem to obtain the “best constant” for classical interpolation estimates of Nirenberg and Gagliardo.
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Weinstein, M.I. Nonlinear Schrödinger equations and sharp interpolation estimates. Commun.Math. Phys. 87, 567–576 (1983). https://doi.org/10.1007/BF01208265
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DOI: https://doi.org/10.1007/BF01208265