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APPLICATION OF METHODS COMMON TO ELEMENTARY PARTICLE PHYSICS AND MANY-BODY PROBLEMS.
RIO GRANDE DO SUL UNIV PORTO ALEGRE (BRAZIL) INSTITUTO DE FISICA*
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The problem of broken symmetries in Quantum Electrodynamics was investigated. The role played by current non-conservation and the relation of those non-conserved currents to the Goldstone theorem was clarified through a classical example the Heisenberg Ferromagnet and in a Quantum Electrodynamical calculation. It was concluded that spontaneously broken symmetries may be generated by currents with non zero divergence. A distinction is made between two ways of spontaneous symmetry breaking Local breaking and asymptotical breaking. Finally, the problem of electrons as charged neutrinos was studied quantitatively. Four problems in nuclear physics were and are being studied. The first one was solved and is concerned with the exact sum of the four particle correlation diagrams using the Bethe-Faddeev equation. Two problems concerned with p,2p reactions 150-45MeV are under study, and consist of an investigation of quasi-free diffraction scattering in medium weight nuclei and of a consistent calculation of the distorted momentum distribution in light nuclei. Finally, one problem on the statistical perturbations of angular correlations is being worked on. Author
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