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    • https://phys.libretexts.org/Courses/Georgia_State_University/GSU-TM-Introductory_Physics_II_(1112)/zz%3A_Back_Matter/10%3A_13.1%3A_Appendix_J-_Physics_Formulas_(Wevers)/1.15%3A_Quantum_Field_Theory_and_Particle_Physics
      Quantum field theory, field quantization, Klein Gordon equation, standard model
    • https://phys.libretexts.org/Learning_Objects/A_Physics_Formulary/Physics/15%3A_Quantum_Field_Theory_and_Particle_Physics
      Quantum field theory, field quantization, Klein Gordon equation, standard model
    • https://phys.libretexts.org/Bookshelves/Quantum_Mechanics/Quantum_Physics_(Ackland)/15%3A_The_Quantum_Mechanics_Nobody_Rreally_Understands/15.05%3A_Relativistic_Quantum_Mechanics
      \[\begin {align*} \hat{H}^{2} \psi(\mathbf{r}, t) & = \left\{ c^{2} \left[ \left(\alpha_{x} \right)^{2} \left(\hat{p}_{x} \right)^{2}+ \left(\alpha_{y} \right)^{2} \left(\hat{p}_{y} \right)^{2}+ \left...\[\begin {align*} \hat{H}^{2} \psi(\mathbf{r}, t) & = \left\{ c^{2} \left[ \left(\alpha_{x} \right)^{2} \left(\hat{p}_{x} \right)^{2}+ \left(\alpha_{y} \right)^{2} \left(\hat{p}_{y} \right)^{2}+ \left(\alpha_{z} \right)^{2} \left(\hat{p}_{z} \right)^{2} \right]+m^{2} c^{4} \beta^{2} \right\} \psi(\mathbf{r}, t) \\& +c^{2} \left\{ \left(\alpha_{x} \alpha_{y}+\alpha_{y} \alpha_{x} \right) \hat{p}_{x} \hat{p}_{y}+ \left(\alpha_{y} \alpha_{z}+\alpha_{z} \alpha_{y} \right) \hat{p}_{y} \hat{p}_{z}+ \…

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