Multispike solutions for the Brezis-Nirenberg problem in dimension three

We consider the problem Δu+λu+u5=0, u>0, in a smooth bounded domain Ω in R3, under zero Dirichlet boundary conditions. We obtain solutions to this problem exhibiting multiple bubbling behavior at k different points of the domain as λ tends to a special positive value λ0, which we characterize in terms of the Green function of −Δ−λ.