Multiple Positive Solutions for Nonlocal Elliptic Problems Involving the Hardy Potential and Concave-Convex Nonlinearities

In this paper, we study the existence and multiplicity of solutions for the following fractional problem involving the Hardy potential and concave-convex nonlinearities: $({-}{ Δ})^{\fracα{2}}u- γ\frac{u}{|x|^α}= λf(x) |u|^{q - 2} u + g(x) {\frac{|u|^{p-2}u}{|x|^s}} \ \text{ in } {Ω,} \quad \text{ with Dirichlet boundary condition } u = 0 \ \text{ in } \mathbb{R}^n \setminus Ω,$ where $Ω\subset \mathbb{R}^n$ is a smooth bounded domain in $\mathbb{R}^n$ containing $0$ in its interior, and $f,g \in C(\overlineΩ)$ with $f^+,g^+ \not\equiv 0$ which may change sign in $\overlineΩ.$ We use the variational methods and the Nehari manifold decomposition to prove that this problem has at least two positive solutions for $λ$ sufficiently small. The variational approach requires that $0 < α<2,$ $0 <s < α<n,$ $1<q<2<p \le 2_α^*(s):= \frac{2(n-s)}{n-α},$ and $γ< γ_H(α) ,$ the latter being the best fractional Hardy constant on $\mathbb{R}^n.$

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