Quantum Field Theory: Renormalization

This lecture covers the concept of renormalization in quantum field theory, focusing on the process of regularization and the removal of divergences. The instructor explains the use of counter-terms and the finite volume approach to make loop integrals well-defined. The lecture also delves into the Pauli-Villars regularization method and the implications of analytic continuation to Minkowski space. The discussion extends to the role of symmetry in the renormalization process and the challenges posed by broken symmetries. Various useful formulae and techniques are presented to handle divergences and ensure the consistency of the theory.