A Computer-Assisted Uniqueness Proof for a Semilinear Elliptic Boundary Value Problem

• Published in: arXiv.org
• Main Authors: McKenna, Patrick J, Pacella, Filomena, Plum, Michael, Roth, Dagmar
• Format: Paper Journal Article
• Language: English
• Published: Ithaca Cornell University Library, arXiv.org 22.10.2012
• Subjects: Boundary value problems; Complexity; Dirichlet problem; Domains; Eigenvalues; Mathematics - Analysis of PDEs; Uniqueness
• ISSN: 2331-8422
• DOI: 10.48550/arxiv.1210.5893

A wide variety of articles, starting with the famous paper (Gidas, Ni and Nirenberg in Commun. Math. Phys. 68, 209-243 (1979)) is devoted to the uniqueness question for the semilinear elliptic boundary value problem -{\Delta}u={\lambda}u+u^p in {\Omega}, u>0 in {\Omega}, u=0 on the boundary of {\Omega}, where {\lambda} ranges between 0 and the first Dirichlet Laplacian eigenvalue. So far, this question was settled in the case of {\Omega} being a ball and, for more general domains, in the case {\lambda}=0. In (McKenna et al. in J. Differ. Equ. 247, 2140-2162 (2009)), we proposed a computer-assisted approach to this uniqueness question, which indeed provided a proof in the case {\Omega}=(0,1)x(0,1), and p=2. Due to the high numerical complexity, we were not able in (McKenna et al. in J. Differ. Equ. 247, 2140-2162 (2009)) to treat higher values of p. Here, by a significant reduction of the complexity, we will prove uniqueness for the case p=3.