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- W2046558372 abstract "Mean-field treatments of Yang–Mills theory face the problem of how to treat the Gauss law constraint. In this paper we try to face this problem by studying the excited states instead of the ground state. For this purpose we extend the operator approach to the Random Phase Approximation (RPA) well-known from nuclear physics and recently also employed in pion physics to general bosonic theories with a standard kinetic term. We focus especially on conservation laws, and how they are translated from the full to the approximated theories, demonstrate that the operator approach has the same spectrum as the RPA derived from the time-dependent variational principle, and give—for Yang–Mills theory—a discussion of the moment of inertia connected to the energy contribution of the zero modes to the RPA ground state energy. We also indicate a line of thought that might be useful to improve the results of the Random Phase Approximation." @default.
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- W2046558372 date "2003-10-01" @default.
- W2046558372 modified "2023-09-24" @default.
- W2046558372 title "Generalized random phase approximation and gauge theories" @default.
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- W2046558372 doi "https://doi.org/10.1016/s0003-4916(03)00119-2" @default.
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