Infinitely many sign-changing solutions for critical Hamiltonian systems with linear perturbation

Abstract

In this paper, we study the following elliptic system \begin{equation}\label{main_1} \begin{cases} -Δu = |v|^{p-1} v + ε(αu + β_1 v), & \text{in } Ω, \\ -Δv = |u|^{q-1} u + ε(β_2 u + αv), & \text{in } Ω, \\ u = v = 0, & \text{on } \partial Ω, \end{cases} \tag{*} \end{equation} where \(Ω\) is the unit ball in $\mathbb{R}^N$, \(ε\) is a small parameter, \(α\), \(β_1\) and \(β_2\) are real numbers, \((p, q)\) is a pair of positive numbers lying on the critical hyperbola \begin{equation} \frac{1}{p+1} + \frac{1}{q+1} = \frac{N-2}{N}.\nonumber \end{equation} Under suitable assumptions and suitable restrictions on $(p,q)$ and $N$, we construct infinitely many sign-changing solutions to \eqref{main_1} which look like a positive radial solution to \eqref{main_1} crowned by $k$ negative bubbles arranged on a regular polygon of a suitable radius, whose energy can be arbitrarily large.