Quantum electrodynamics 23 Quantum field theory 8 Quantum theory 6 Particles (Nuclear physics) 5 Physics 4 Quantum electrodynamics -- Problems, exercises, 4 Electrodynamics 3 Quantum Electrodynamics 3 Quantum chromodynamics 3 Atom-Atom Collisions 2 Electrodynamics; Physics 2 Feynman diagrams 2 Gauge fields (Physics) 2 Standard model (Nuclear physics) 2 Atomic structure 1 Bjorken, James D. 1 Conduction electrons 1 Degree of freedom 1 Electodynamics 1 Electromagnetic theory 1 Electrons 1 Energy 1 Equations of motion 1 European organization for nuclear research 1 Field theory (Physics) 1 Fluctuations (Physics) 1 General 1 Higgs bosons 1 Higgs, Peter 1 Hoott, G T. 1