A modern introduction to quantum field theory for graduates, providing intuitive, physical explanations supported by real-world applications and homework proble

Quantum field theory is the basic mathematical framework that is used to describe elementary particles. This textbook provides a complete and essential introduc

The notion of renormalization is at the core of several spectacular achievements of contemporary physics, and in the last years powerful techniques have been de

The idea of this book originated from two series of lectures given by us at the Physics Department of the Catholic University of Petr6polis, in Brazil. Its aim

The last decade has seen striking progress in the subject of renormalization in quantum field theory. The old subject of perturbative renormalization has been r