Orateur
Gaetano Lambiase
Description
We employ the Quantum Field Theory approach to investigate graviton emission from massive sources. Applying this method to gravitational-wave emission by binary systems in fourth-order gravity, we find a cancellation between the contributions of the massless graviton and the additional massive spin-2 ghost and scalar modes. Consequently, the General Relativity quadrupole formula is not recovered, in conflict with precision measurements of binary systems. Bounds on parameters of the gravitational models under consideration are inferred.