Multiplicity of positive solutions to a critical fractional equation with Hardy potential and concave–convex nonlinearities

The aim of this paper is to study the following fractional critical problem with Hardy potential and concave–convex nonlinearities (−Δ)su−μu|x|2s=λuq+u2s∗−1,u>0 in Ω,u=0in RN∖Ω, where (−Δ)s is the fractional Laplace operator, s∈(0,1), Ω⊂RN is a smooth bounded domain containing the origin, N>2s, μ∈[0,ΛN,s), λ>0, 00. Moreover, in the convex power case (1