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The AGP model for fermion systems

✍ Scribed by A. John Coleman

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
158 KB
Volume
63
Category
Article
ISSN
0020-7608

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✦ Synopsis

A mathematically rigorous treatment of the antisymmetrized geminal power AGP model is given. The model is advocated as an extremely flexible tool for studying a wide variety of fermion systems, characterized by a single Slater determinant, on the one hand, or Yang's most highly correlated wave function, on the other. When the first-order reduced density matrix of the actual system has eigenvalues which are evenly degenerate, the model can treat one-particle properties exactly. A formula is obtained for the precise energy of an AGP state in the Born᎐Oppenheimer approximation. An estimate is given of the error which occurs when the second-order density matrix of an AGP state is approximated by the widely used expression involving the so-called anomalous Green's function.

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