Master thesis defense by Pablo Leon Ortega

Title: Classical observables and double copy

Abstract: This thesis reviews the modern computation of classical gravitational observables within the QFT formalism. We introduce the modern approach to the unitarity in amplitudes, and briefly review central concepts in the field of Feynman Integrals. In this context, we verify and review the simplifications that arise from using on-shell tools such as amplitudes and double copy with respect to Feynman rules, and review the relation between soft and classical scaling and its implementation. We then focus in the search of explicit structures manifesting double copy at the level of the master integral coefficients at L-loops, particularizing in probe diagrams (0SF)