An application to a 3-level Lipkin model

  title={An application to a 3-level Lipkin model},
  author={Maureen M. Grasso and F. Catara},
A limitation common to all extensions of RP A including only particle-hole configurations is that they violate to some extent the Energy Weighted Sum Rules. Considering one such extension, the improved RP A (IRP A), already used to study the electronic properties of metallic clusters, we show how it can be generalized in order to eliminate this drawback… CONTINUE READING