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On the Neumann problem of Hardy-Sobolev critical equations with the multiple singularities

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The first author is supported by Grant-in-Aid for JSPS Research Fellow (JSPS KAKENHI Grant Number JP16J08945).
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  • Let $N ≥ 3$ and $Ω \subset \mathbb{R}^N$ be a $C^2$ bounded domain. We study the existence of positive solution $u ∈ H^1(Ω)$ of

    $\begin{align*}\left\{\begin{array}{l}-\Delta u + \lambda u = \frac{|u|^{2^*(s)-2}u}{|x-x_1|^s} + \tau \frac{|u|^{2^*(s)-2}u}{|x-x_2|^s}\text{ in }\Omega\\\frac{\partial u}{\partial \nu} = 0 \text{ on }\partial\Omega,\end{array}\right.\end{align*}$

    where $τ = 1$ or $-1$, $0 < s <2$, $2^*(s) = \frac{2(N-s)}{N-2}$ and $x_1, x_2 ∈ \overline{Ω}$ with $x_1 ≠ x_2$. First, we show the existence of positive solutions to the equation provided the positive $λ$ is small enough. In case that one of the singularities locates on the boundary and the mean curvature of the boundary at this singularity is positive, the existence of positive solutions is obtained for any $λ > 0$ and some $s$ depending on $τ$ and $N$. Furthermore, we extend the existence theory of solutions to the equations for the case of the multiple singularities.

    Mathematics Subject Classification: Primary: 35J25; Secondary: 35J61.


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