[2] In 1999, together with Gian Giudice and James Wells, Riccardo Rattazzi carried out the first detailed study of the collider signatures of the large extra dimension scenarios of TeV-scale gravity.

[3] In 2001, together with Alberto Zaffaroni, Riccardo Rattazzi gave the holographic description of the Randall-Sundrum solution of the hierarchy problem, as well as interpreted the Goldberger-Wise mechanism in terms of dimensional transmutation.

[5] In 2006, together with Allan Adams, Nima Arkani-Hamed, Sergei Dubovsky and Alberto Nicolis, Riccardo Rattazzi discovered surprising inconsistencies which may be present in the effective Lagrangians in quantum field theory.

[6] In 2007, together with Gian Giudice, Christoph Grojean and Alex Pomarol, Riccardo Rattazzi constructed a low-energy effective Lagrangian which encapsulated general properties of composite Higgs boson models in a way practically useful for the upcoming LHC experiments.

[8] In 2009, together with Alberto Nicolis and Enrico Trincherini, Riccardo Rattazzi discovered the galileons, a new class of derivatively coupled scalar field theories invariant under the Galilean transformations.