Palais-Smale approaches to semilinear elliptic equations in unbounded domains
DOI:
https://doi.org/10.58997/ejde.mon.06Abstract
Let \(\Omega\) be a domain in \(\mathbb{R}^{N}\), \(N\geq1\), and \(2^{\ast}=\infty\) if \(N=1,2\), \(2^{\ast}=\frac{2N}{N-2}\) if \(N\) is greater than 2, \(2 < p < 2^{\ast}\). Consider the semilinear elliptic problem $$\displaylines{ -\Delta u+u=|u|^{p-2}u\quad \hbox{in }\Omega;\\ u\in H_{0}{1}(\Omega). }$$ Let \(H_{0}^{1}(\Omega)\) be the Sobolev space in \(\Omega\). The existence, the nonexistence, and the multiplicity of positive solutions are affected by the geometry and the topology of the domain \(\Omega\). The existence, the nonexistence, and the multiplicity of positive solutions have been the focus of a great deal of research in recent years.
That the above equation in a bounded domain admits a positive solution is a classical result. Therefore the only interesting domains in which this equation admits a positive solution are proper unbounded domains. Such elliptic problems are difficult because of the lack of compactness in unbounded domains. Remarkable progress in the study of this kind of problem has been made by P. L. Lions. He developed the concentration-compactness principles for solving a large class of minimization problems with constraints in unbounded domains. The characterization of domains in which this equation admits a positive solution is an important open question. In this monograph, we present various analyses and use them to characterize several categories of domains in which this equation admits a positive solution or multiple solutions.
For more information see https://ejde.math.txstate.edu/Monographs/06/abstr.html
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