Semiclassical standing waves with clustering peaks for nonlinear Schrodinger equations

The authors study the following singularly perturbed −ϵ 2 Δu V(x)u=f(u) in R N . Their main result is the existence of a family of solutions with peaks that cluster near a local maximum of V(x) . A local variational and deformation argument in an infinite dimensional space is developed to establish the existence of such a family for a general class of nonlinearities f .