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Quantum Field Theory (PDF 155p)
This book provides a very clear and well written introduction to Quantum Field Theory. Topics covered includes: Classical Field Theory, Free Fields, Interacting Fields, The Dirac Equation, Quantizing the Dirac Field and Quantum Electrodynamics.
Author(s): Dr David Tong
155 Pages 
An Introduction to Quantum Field Theory by University of Manchester
This note explains Classical field theory, Quantum field theory, Interacting scalar fields and perturbation theory.
Author(s): University of Manchester
48 Pages
Lecture Notes on Quantum Field Theory by Kevin Zhou
The contents of this notes include: Scalar Fields, Interacting Scalar Fields, Spinor Fields, Vector Fields, Quantum Electrodynamics, Amplitudes, Path Integrals in Zero Dimensions, Path Integrals in Higher Dimensions, Wilsonian Renormalization, Perturbative Renormalization, Solitons, Monopoles , Anomalies, Instantons.
Author(s): Kevin Zhou
270 Pages
Introduction to Quantum Field Theory by Marina von Steinkirch
This book is divided into two parts. The first part is the old-school way of learning quantum field theory. The second part is dedicated to Topological Field Theories. Topics covered includes: Spin Zero, Fields with Spin, Non-Abelian Field Theories, Quantum Electrodynamics, Electroweak Theory, Quantum Chromodynamics, Renormalization, Sigma Model, Topological Field Theories.
Author(s): Marina von Steinkirch
121 Pages
A Very Short Introduction to Quantum Field Theory
This note covers the following topics: Second Quantization and Relativistic Fields, The Interaction Picture and the S-Matrix, The Trouble with Loops, Cross Sections and Decay Rates, The Dirac Equation, The Photon Field, Quantum Electrodynamics.
Author(s): A. W. Stetz
145 Pages