By van Nieuwenhuizen P.
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Extra resources for Advanced quantum gauge field theory
He just started from the equations Aµ = − 4π j , and noticed that they are equivalent to c µ Maxwell’s equations provided that, as he stated in his review article of 1932, “. . [The scalar potential] V and [the vector potential] U are not completely independent of each other; they satisfy the relation divU + 1c ∂V = 0, which is closely related to the equation ∂t of continuity for the electricity” . However, Fermi did not impose ∂ µ Aµ = 0 as an Pauli (1900–1958), Fermi (1901–1954), Heisenberg (1901–1976), Jordan (1902-1980), and Dirac (1902–1984) were all in their late twenties when they made their discoveries.
A. Lorentz and P. Zeeman). 36 Before the neutrino was conceived, nuclei were thought to be bound states of protons and electrons. For example, the nitrogen nucleus with A = 14 and Z = 7 required 14 protons and 7 electrons, and should thus have half-integer spin. However, band spectra showed that it had spin 1. Another problem with the proton-electron model of the nucleus was that nuclei would have far too large magnetic moments (a factor 1000 too large) if they contained electrons. See ref. b. 35 2.
Schwinger pioneered many other developments in quantum field theory . He introduced the proper time technique (based on the heat kernel method which was developed by Fock ) in a study of the gauge invariance of vacuum polarization (perhaps his best paper). We discuss this further in the chapter on anomalies. He introduced the parameters to combine propagators in momentum space (related but not equal to the parameters introduced later by Feynman, which are nowadays called Feynman parameters).
Advanced quantum gauge field theory by van Nieuwenhuizen P.