8.323 Relativistic Quantum Field Theory I (Spring 2023, MIT OCW): Lecture 12 - More on Perturbation Theory and Feynman Diagrams

8.323 Relativistic Quantum Field Theory I

8.323 Relativistic Quantum Field Theory I (Spring 2023, MIT OCW). Instructor: Prof. Hong Liu. This course is a one-term self-contained subject in quantum field theory. Concepts and basic techniques are developed through applications in elementary particle physics and condensed matter physics. (from ocw.mit.edu)

Lecture 12 - More on Perturbation Theory and Feynman Diagrams

Vacuum diagrams, connected diagrams, cancellation of vacuum diagrams, explicit statement of LSZ theorem and intuitions behind it, scattering amplitudes from amputated diagrams with external legs on-shell, examples.

Go to the Course Home or watch other lectures:

Lecture 01 - Classical Field Theories and Principle of Locality

Lecture 02 - Symmetries and Conservation Laws

Lecture 03 - Why Quantum Field Theory

Lecture 04 - Canonical Quantization of a Free Scalar Field Theory

Lecture 05 - Complex Scalar Field Theory and Anti-Particle

Lecture 06 - Propagators and Green Functions

Lecture 07 - Interacting Theories and S-Matrix

Lecture 08 - Path Integral Formalism for Non-Relativistic Quantum Mechanics

Lecture 09 - Path Integral Formalism for QFT; Computation of Time-Ordered Correlation Functions

Lecture 10 - Time-Ordered Correlation Functions in Field Theory

Lecture 11 - Computation of Correlation Functions in Perturbation Theory and Feynman Diagrams