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Remarks on Entire Solutions for Two Fourth-Order Elliptic Problems

Published online by Cambridge University Press:  23 November 2015

Baishun Lai
Affiliation:
Institute of Contemporary Mathematics, Henan University, Kaifeng 475004, People's Republic of China (laibaishun@henu.edu.cn)
Dong Ye
Affiliation:
IECL, UMR 7502, Département de Mathématiques, Université de Lorraine, Ile de Saulcy, 57045 Metz, France (dong.ye@univ-lorraine.fr)

Abstract

We are interested in entire solutions for the semilinear biharmonic equation Δ2u = f(u) in ℝN, where f(u) = eu or –up (p > 0). For the exponential case, we prove that for the polyharmonic problem Δ2mu = eu with positive integer m, any classical entire solution verifies Δ2m–1u < 0; this completes the results of Dupaigne et al. (Arch. Ration. Mech. Analysis208 (2013), 725–752) and Wei and Xu (Math. Annalen313 (1999), 207–228). We also obtain a refined asymptotic expansion of the radial separatrix solution to Δ2u = eu in ℝ3, which answers a question posed by Berchio et al. (J. Diff. Eqns252 (2012), 2569–2616). For the negative power case, we show the non-existence of the classical entire solution for any 0 < p ⩽ 1.

Type
Research Article
Copyright
Copyright © Edinburgh Mathematical Society 2015 

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