Bifurcations of Positive and Negative Continua in Quasilinear Elliptic Eigenvalue Problems |
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Authors: | Petr Girg Peter Takáč |
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Affiliation: | 1. Department of Mathematics, Faculty of Applied Sciences, University of West Bohemia, P.O. Box 314, CZ-30614, Plzeň, Czech Republic 2. Institut für Mathematik, Universit?t Rostock, Universit?tsplatz 1, D-18055, Rostock, Germany
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Abstract: | The main result of this work is a Dancer-type bifurcation result for the quasilinear elliptic problem | ((P)) | Here, Ω is a bounded domain in denotes the Dirichlet p-Laplacian on , and is a spectral parameter. Let μ1 denote the first (smallest) eigenvalue of −Δ p . Under some natural hypotheses on the perturbation function , we show that the trivial solution is a bifurcation point for problem (P) and, moreover, there are two distinct continua, and , consisting of nontrivial solutions to problem (P) which bifurcate from the set of trivial solutions at the bifurcation point (0, μ1). The continua and are either both unbounded in E, or else their intersection contains also a point other than (0, μ1). For the semilinear problem (P) (i.e., for p = 2) this is a classical result due to E. N. Dancer from 1974. We also provide an example of how the union looks like (for p > 2) in an interesting particular case. Our proofs are based on very precise, local asymptotic analysis for λ near μ1 (for any 1 < p < ∞) which is combined with standard topological degree arguments from global bifurcation theory used in Dancer’s original work. Submitted: July 28, 2007. Accepted: November 8, 2007. |
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