Abstract
We consider singularly perturbed nonlinear Schrödinger equations
where \(V \in C(\mathbb {R}^N, \mathbb {R})\) and \(f\) is a nonlinear term which satisfies the so-called Berestycki–Lions conditions. We assume that there exists a bounded domain \(\Omega \subset \mathbb {R}^N\) such that
and we set \(K = \{ x \in \Omega \ | \ V(x) = m_0\}\). For \(\varepsilon >0\) small we prove the existence of at least \({\mathrm{cupl}}(K) + 1\) solutions to (0.1) concentrating, as \(\varepsilon \rightarrow 0\) around \(K\). We remark that, under our assumptions of \(f\), the search of solutions to (0.1) cannot be reduced to the study of the critical points of a functional restricted to a Nehari manifold.
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Acknowledgments
The authors would like to thank Professor Thomas Bartsch for providing them with a proof of Lemma 5.5 and for very helpful discussions on relative category and cup-length. The first author would like to thank Professor Marco Degiovanni for very helpful discussions on relative category and for suggesting the counter-example in Remark 4.3.
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Communicated by P. Rabinowitz.
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Cingolani, S., Jeanjean, L. & Tanaka, K. Multiplicity of positive solutions of nonlinear Schrödinger equations concentrating at a potential well. Calc. Var. 53, 413–439 (2015). https://doi.org/10.1007/s00526-014-0754-5
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DOI: https://doi.org/10.1007/s00526-014-0754-5