Michelangeli, AlessandroScandone, Raffaele2021-02-222021-02-222018https://openscience.sissa.it/handle/1963/35425SISSA preprint 40-2018-MATEWe prove the absence of positive real resonances for Schrodinger operators with finitely ¨ many point interactions in R 3 and we discuss such a property from the perspective of dispersive and scattering features of the associated Schrodinger propagator.enpoint interactionssingular perturbations of the Laplacianpositive resonanceslimiting absorption principledefinite positive functionsArticle