On the fractional NLS equation and the effects of the potential well's topology

Abstract

In this paper we consider the fractional nonlinear Schrödinger equation $${\epsilon }^{2s}(-\Delta {)}^{s}v+V(x)v=f(v),x\in {\mathbb{R}}^N$$ where $s\in (0,1)$, $N\ge 2$, $V\in C({\mathbb{R}}^N,\mathbb{R})$ is a positive potential and $f$ is a nonlinearity satisfying Berestycki-Lions type conditions. For $\epsilon >0$ small, we prove the existence of at least $\mathrm{cupl}(\mathrm{K})+1$ positive solutions, where $K$ is a set of local minima in a bounded potential well and $\mathrm{cupl}(\mathrm{K})$ 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 $\epsilon$ small.

References in corpus (8)

• Fractional Quantum Mechanics and Levy Path Integrals
• Fractional Schrodinger equation
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• Local behavior of fractional $p$-minimizers
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Cited by in corpus (3)

• On fractional Schrödinger equations with Hartree type nonlinearities
• Infinitely many free or prescribed mass solutions for fractional Hartree equations and Pohozaev identities
• Asymptotic decay of solutions for sublinear fractional Choquard equations