- PHYS6004 (Advanced Quantum Field Theory)

Extremely brief overview to QED. First, covers a recap of Dirac theory. Then states quantisation of Dirac and photon fields (without proof). Feynman rules are motivated and stated (not derived) - we will see the derivation in the later parts of the course. Finally, a semi-relativistic treatment of the Lamb shift is given (following paper of Bethe), which shows an example of infinities in the theory and how to deal with them (renormalisation)

**Lecture Notes:**

- 01: Dirac theory: recap
- 02: QED overview, Feynman rules
- 03: Semi-relativistic treatment of Lamb shift, renormalisation
- Note: some typos, sign mistakes — will be fixed “soon”

**Texts:**

- Peskin & Schroeder,
*An Introduction To Quantum Field Theory*- Main book for the course, available as pdf from library

- Sakurai,
*Advanced Quantum Mechanics*- A little dated, but very nice. Available from library