On the fractional NLS equation and the effects of the potential Well’s topology. (English) Zbl 1487.35010
Summary: In this paper we consider the fractional nonlinear Schrödinger equation
\[
\varepsilon^{2s}(-\Delta)^s v+V(x)v=f(v),\quad x\in\mathbb{R}^N,
\]
where \(s\in (0,1), N\geq 2, f\) is a nonlinearity satisfying Berestycki-Lions type conditions and \(V\in C(\mathbb{R}^N,\mathbb{R})\) is a positive potential. For \(\varepsilon >0\) small, we prove the existence of at least \(\mathrm{cupl}(K)+1\) positive solutions, where \(K\) is a set of local minima in a bounded potential well and \(\mathrm{cupl}(K)\) denotes the cup-length of \(K\). By means of a variational approach, we analyze the topological difference between two levels of an indefinite functional in a neighborhood of expected solutions. Since the nonlocality comes in the decomposition of the space directly, we introduce a new fractional center of mass, via a suitable seminorm. Some other delicate aspects arise strictly related to the presence of the nonlocal operator. By using regularity results based on fractional De Giorgi classes, we show that the found solutions decay polynomially and concentrate around some point of \(K\) for \(\varepsilon\) small.
MSC:
| 35A15 | Variational methods applied to PDEs |
| 35B25 | Singular perturbations in context of PDEs |
| 35J20 | Variational methods for second-order elliptic equations |
| 35Q55 | NLS equations (nonlinear Schrödinger equations) |
| 35R11 | Fractional partial differential equations |
| 47J30 | Variational methods involving nonlinear operators |
| 58E05 | Abstract critical point theory (Morse theory, Lyusternik-Shnirel’man theory, etc.) in infinite-dimensional spaces |
Keywords:
fractional Laplacian; nonlinear Schrödinger equation; concentration phenomena; Pohozaev identity; relative cup-lengthReferences:
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