An Introduction to Quantum Field Theory

The book is a graduate level course of quantum field theory, relativistic quantum mechanics and quantum electrodynamics. It includes worked examples to make the content accessible to students and intuitive explanations behind the mathematics. The book discusses the basics of quantum electrodynamics, theory of renormalization and its relation to statistical mechanics and introduces renormalization group. This discussion sets the stage for a discussion of physical principles underlying fundamental interactions of elementary particle physics and their description by gauge field theories.