2. }

3. space where are positive and negative energy solutions to free KG equation time

4. Transition operator

5. Physical interpretation of Quantum Mechanics Klein Gordon equation

6. Feynman rule associated with Feynman diagram Transition operator

7. Compton scattering of a π meson Feynman rules Klein Gordon External photon

9. The Dirac equationRELATIVISTIC QUANTUM MECHANICS

10. The Lorentz group } Generate the group SO(3,1) To construct representations a more convenient (non-Hermitian) basis is }

11. The Lorentz group } Generate the group SO(3,1) To construct representations a more convenient (non-Hermitian) basis is Representations

12. Weyl spinors 2-component spinors of SU(2) Rotations and Boosts Dirac spinor Can combineto form a 4-component “Dirac” spinor Lorentz transformations where Weyl basis

13. Weyl spinors 2-component spinors of SU(2) Rotations and Boosts Dirac spinor Can combineto form a 4-component “Dirac” spinor Lorentz transformations where Note : (Dirac gamma matrices, …new 4-vector )

14. The Dirac equation Fermions described by 4-cpt Dirac spinors New 4-vector In momentum space :