Qed
Quantum Field Theory · Part 4
217 KB6 sections4 key equationsLaTeX typeset
Table of Contents
- 1.3.1 The Free Dirac and Maxwell Lagrangians
- 2.3.2 Gauging the U(1) Symmetry
- 3.3.3 The Full QED Lagrangian
- 4.3.4 Summary of Gauge Transformations
- 5.3.5 The Fine Structure Constant
- 6.Key Concepts
Key Equations
$$\mathcal{L}_{\text{Dirac}} = \bar{\psi}(i\gamma^\mu\partial_\mu - m)\psi$$
$$J^\mu = \bar{\psi}\gamma^\mu\psi, \qquad \partial_\mu J^\mu = 0$$
$$\psi(x) \to e^{ie\alpha(x)}\psi(x)$$
$$\boxed{D_\mu \equiv \partial_\mu + ieA_\mu}$$
Equations are rendered with MathJax in the PDF with professional LaTeX typesetting.
Course Context
This PDF is part of the Quantum Field Theory course on CoursesHub.World. Free online course in Quantum Field Theory (QFT). 8 parts covering classical field theory, canonical quantization, path integrals, QED, non-Abelian gauge theories, renormalization, the Standard Model,...