Non-radial sign-changing solutions for the Schroedinger-Poisson problem   in the semiclassical limit
  We study the existence of nonradial sign-changing solutions to the Schroedinger-Poisson system in dimension N>=3. We construct nonradial sign-changing multi-peak solutions whose peaks are displaced in suitable symmetric configurations and collapse to the same point. The proof is based on the Lyapunov-Schmidt reduction. 
Isabella Ianni and Giusi Vaira
math.AP