Multi-bubble nodal solutions to slightly subcritical elliptic problems with Hardy terms

The paper is concerned with the slightly subcritical elliptic problem with Hardy term $\left\{ \begin{aligned} -Δu-μ\frac{u}{|x|^2} &= |u|^{2^{\ast}-2-ε}u &&\quad \text{in } Ω, \\\ u &= 0&&\quad \text{on } \partialΩ, \end{aligned} \right.$ in a bounded domain $Ω\subset\mathbb{R}^N$ with $0\inΩ$, in dimensions $N\ge7$. We prove the existence of multi-bubble nodal solutions that blow up positively at the origin and negatively at a different point as $ε\to0$ and $μ=ε^α$ with $α>\frac{N-4}{N-2}$. In the case of $Ω$ being a ball centered at the origin we can obtain solutions with up to $5$ bubbles of different signs. We also obtain nodal bubble tower solutions, i.e. superpositions of bubbles of different signs, all blowing up at the origin but with different blow-up order. The asymptotic shape of the solutions is determined in detail.

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