Existence and symmetry of least energy nodal solutions for Hamiltonian elliptic systems

Abstract : In this paper we prove existence of least energy nodal solutions for the Hamiltonian elliptic system with Hénon –type weights −∆u = |x| β |v| q−1 v, −∆v = |x| α |u| p−1 u in Ω, u = v = 0 on ∂Ω, where Ω is a bounded smooth domain in R N , N ≥ 1, α, β ≥ 0 and the nonlinearities are superlinear and subcritical, namely 1 > 1 p + 1 + 1 q + 1 > N − 2 N. When Ω is either a ball or an annulus centered at the origin and N ≥ 2, we show that these solutions display the so-called foliated Schwarz symmetry. It is natural to conjecture that these solutions are not radially symmetric. We provide such a symmetry breaking in a range of parameters where the solutions of the system behave like the solutions of a single equation. Our results on the above system are new even in the case of the Lane-Emden system (i.e. without weights). As far as we know, this is the first paper that contains results about least energy nodal solutions for strongly coupled elliptic systems and their symmetry properties.
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Denis Bonheure, Ederson Moreira dos Santos, Miguel Ramos, Hugo Tavares. Existence and symmetry of least energy nodal solutions for Hamiltonian elliptic systems. Journal de Mathématiques Pures et Appliquées, Elsevier, 2015, doi:10.1016/j.matpur.2015.07.005. ⟨10.1016/j.matpur.2015.07.005⟩. ⟨hal-01182582⟩

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