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• W2075772879 abstract "We develop and test efficient approximations to estimate ground state correlations associated with low- and zero-energy modes. The scheme is an extension of the generator coordinate method (GCM) within Gaussian overlap approximation (GOA). We show that the GOA fails in non-Cartesian topologies and presents a topologically correct generalization of the GOA (topGOA). A random-phase-approximation like (RPA-like) correction is derived as the small amplitude limit of topGOA, called topRPA. Using exactly solvable models, the topGOA and topRPA schemes are compared with conventional approaches (GCM-GOA, RPA, Lipkin-Nogami projection) for rotational-vibrational motion and for particle-number projection. The results shows that the new schemes perform very well in all regimes of coupling." @default.
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• W2075772879 date "2002-06-11" @default.
• W2075772879 modified "2023-09-23" @default.
• W2075772879 title "Projection and ground state correlations made simple" @default.
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• W2075772879 doi "https://doi.org/10.1103/physrevc.65.064320" @default.
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