Byeon, Jaeyoung; Jeanjean, Louis Multi-peak standing waves for nonlinear Schrödinger equations with a general nonlinearity. (English) Zbl 1155.35089 Discrete Contin. Dyn. Syst. 19, No. 2, 255-269 (2007). The work is dealing with a stationary nonlinear equation in the space of dimension \(N\geq 3\), \[ (\hbar^2/2)\Delta v -(V({\mathbf r}) - E)v + f(v) = 0, \]where a function \(f(v)\) is real, \(\Delta\) is the \(N\)-dimensional Laplacian, and, in a typical case, \(f(v)=-v^3\). This equation appears as the stationary version of the multidimensional Gross-Pitaevskii equation for Bose-Einstein condensates. It is assumed that potential \(V({\mathbf r})\) is chosen in such a form that, in the Thomas-Fermi approximation, which corresponds to \(\hbar^2 \to 0\), a solution reduces to a set of strongly localized noninteracting peaks, pinned to local minima of the potential. The objective of the work is to produce a rigorous proof of the fact that the solution keeps essentially the same form at small finite values of \(\hbar^2\), by “gluing” togehter the strongly localized peaks. This is done by means of a purely variational method. Reviewer: Boris A. Malomed (Tel Aviv) Cited in 26 Documents MSC: 35Q55 NLS equations (nonlinear Schrödinger equations) 35J60 Nonlinear elliptic equations 35A15 Variational methods applied to PDEs Keywords:Gross-Pitaevskii equation; Thomas-Fermi approximation; Schrödinger equation PDFBibTeX XMLCite \textit{J. Byeon} and \textit{L. Jeanjean}, Discrete Contin. Dyn. Syst. 19, No. 2, 255--269 (2007; Zbl 1155.35089) Full Text: DOI