# Revista Matemática Iberoamericana

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**Volume 33, Issue 2, 2017, pp. 509–546**

**DOI: 10.4171/RMI/947**

Bubbling solutions for nonlocal elliptic problems

Juan Dávila^{[1]}, Luis López Ríos

^{[2]}and Yannick Sire

^{[3]}(1) Universidad de Chile, Santiago, Chile

(2) Universidad de Buenos Aires, Argentina

(3) Université Aix-Marseille, France

We investigate bubbling solutions for the nonlocal equation
$$A^s_{\Omega} u =u^p,\ u > 0 \quad \mbox{in } \Omega,$$
under homogeneous Dirichlet conditions, where $\Omega$ is a bounded and smooth domain. The operator $A^s_{\Omega}$ stands for two types of nonlocal operators that we treat in a unified way: either the spectral fractional Laplacian or the restricted fractional Laplacian. In both cases $s \in (0,1)$, and the Dirichlet conditions are different: for the spectral fractional Laplacian, we prescribe $u=0$ on $\partial \Omega$, and for the restricted fractional Laplacian, we prescribe $u=0$ on $\mathbb R^n \backslash \Omega$. We construct solutions when the exponent $p = (n+2s)/(n-2s) \pm \epsilon$ is close to the *critical one*, concentrating as $\epsilon \to 0$ near critical points of a reduced function involving the Green and Robin functions of the domain.

*Keywords: *Fractional Laplacian, Dirichlet problem, sub and supercritical exponents, stable critical points

Dávila Juan, López Ríos Luis, Sire Yannick: Bubbling solutions for nonlocal elliptic problems. *Rev. Mat. Iberoamericana* 33 (2017), 509-546. doi: 10.4171/RMI/947