## Abstract

The aim of this paper is to deal with the non-local fractional counterpart of the Laplace equation involving critical non-linearities studied in the famous paper of Brezis and Nirenberg (1983). Namely, our model is the equation (equations found) where (−Δ)^{s}is the fractional Laplace operator, s ∈ (0, 1), Ω is an open bounded set of Rn, n > 2s, with Lipschitz boundary, λ > 0 is a real parameter and 2∗ = 2n/(n − 2s) is a fractional critical Sobolev exponent. In this paper we first study the problem in a general framework; indeed we consider the equation (equations found), where L_{K}is a general non-local integrodifferential operator of order s and f is a lower order perturbation of the critical power |u|^{2}
^{∗}
^{−}
^{2}u. In this setting we prove an existence result through variational techniques. Then, as a concrete example, we derive a Brezis-Nirenberg type result for our model equation; that is, we show that if λ_{1,s}is the first eigenvalue of the non-local operator (−Δ)^{s}with homogeneous Dirichlet boundary datum, then for any λ ∈ (0, λ_{1,s}) there exists a non-trivial solution of the above model equation, provided n≥4s. In this sense the present work may be seen as the extension of the classical Brezis-Nirenberg result to the case of non-local fractional operators.

Original language | English |
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Pages (from-to) | 67-102 |

Number of pages | 36 |

Journal | Transactions of the American Mathematical Society |

Volume | 367 |

Issue number | 1 |

DOIs | |

Publication status | Published - 1 Jan 2015 |

Externally published | Yes |