{"title":"Standing Waves for Non-periodic Discrete Nonlinear Schrödinger Equations via Morse Theory","authors":"","doi":"10.1007/s40840-024-01678-4","DOIUrl":null,"url":null,"abstract":"<h3>Abstract</h3> <p>In this paper, we consider the following discrete nonlinear Schrödinger equation <span> <span>$$\\begin{aligned} \\left\\{ \\begin{array}{l} -\\Delta u_{n}+V_{n}u_{n}-\\omega u_{n}=f_{n}(u_{n}), \\quad n \\in \\mathbb {Z}, \\\\ \\lim _{|n| \\rightarrow \\infty } u_{n}=0, \\end{array}\\right. \\end{aligned}$$</span> </span>with non-periodic potentials. We obtain the existence of nontrivial solutions of this equation with various nonlinearities by using Morse theory. In this way, we need to compute the critical groups of the corresponding action functional of the equation. To the best of our knowledge, there is no result focusing on this issue in the literature.</p>","PeriodicalId":50718,"journal":{"name":"Bulletin of the Malaysian Mathematical Sciences Society","volume":"23 1","pages":""},"PeriodicalIF":1.0000,"publicationDate":"2024-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Bulletin of the Malaysian Mathematical Sciences Society","FirstCategoryId":"100","ListUrlMain":"https://doi.org/10.1007/s40840-024-01678-4","RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATHEMATICS","Score":null,"Total":0}
引用次数: 0
Abstract
In this paper, we consider the following discrete nonlinear Schrödinger equation $$\begin{aligned} \left\{ \begin{array}{l} -\Delta u_{n}+V_{n}u_{n}-\omega u_{n}=f_{n}(u_{n}), \quad n \in \mathbb {Z}, \\ \lim _{|n| \rightarrow \infty } u_{n}=0, \end{array}\right. \end{aligned}$$with non-periodic potentials. We obtain the existence of nontrivial solutions of this equation with various nonlinearities by using Morse theory. In this way, we need to compute the critical groups of the corresponding action functional of the equation. To the best of our knowledge, there is no result focusing on this issue in the literature.
期刊介绍:
This journal publishes original research articles and expository survey articles in all branches of mathematics. Recent issues have included articles on such topics as Spectral synthesis for the operator space projective tensor product of C*-algebras; Topological structures on LA-semigroups; Implicit iteration methods for variational inequalities in Banach spaces; and The Quarter-Sweep Geometric Mean method for solving second kind linear fredholm integral equations.