Affiliations: Department of Mathematics, POSTECH, San 31 Hyoja‐dong, Nam‐gu, Pohang, Kyungbuk 790‐784, Republic of Korea E‐mail:jbyeon@postech.ac.kr
Note: [] This work was supported by grant No. 1999‐2‐102‐003‐5 from the Interdisciplinary Research Program of the KOSEF.
Abstract: We consider the problem: Δu+up=0 in ΩR,u=0 on ∂ΩR,u>0 in ΩR, where ΩR≡{x∈RN|R−1<|x|<R+1}, N≥3, and 1<p<(N+2)/(N−2). This problem is invariant under the orthogonal coordinate transformations, in other words, O(N)‐symmetric. Let G be a closed subgroup O(N), and HGR≡{u∈H01,2(RN) |u(x)=u(gx), x∈ΩR, g∈G}. In the earlier paper [5], an existence of locally minimal energy solutions in HGR due to a structural property of the orbits space of an action G×SN−1→SN−1 was showed for large R. In this paper, it will be showed that more various types of solutions than those obtained in [5], which are close to a finite sum of locally minimal energy solutions in HRG for some G⊂O(N), appear as R→∞. Furthermore, we discuss possible types of solutions and show that any solution with exactly two local maximum points should be O(N−1)‐symmetric for large R>0.
Keywords: nonlinear elliptic, symmetry, group actions, orbits
