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The antisymmetrized geminal power approximation to the excitation propagator
Author(s) -
Weiner Brian,
Kurtz Henry A.
Publication year - 1985
Publication title -
international journal of quantum chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.484
H-Index - 105
eISSN - 1097-461X
pISSN - 0020-7608
DOI - 10.1002/qua.560270611
Subject(s) - propagator , geminal , excitation , wave function , physics , random phase approximation , quantum electrodynamics , polarization (electrochemistry) , gravitational singularity , quantum mechanics , mathematical physics , chemistry , stereochemistry
Abstract A consistent propagator approximation, denoted as the excitation propagator, is introduced. This propagator describes excitations between N ‐particle states and its approximation has properties required of consistent random phase approximation schemes. Several properties of this propagator are explored when based on a generalized antisymmetrized geminal power wavefunction. How singularities in the metric occur and how to remove them is discussed in detail. The excitation propagator is also contrasted with the principal (polarization) propagator.