Answers are grounded in this paper and cite their sources.
The cluster-expansion approach to the correlation problem, pioneered by Cocster, Kümmel, Cizek and Paldus, is extended to calculation of static and dynamic properties of many-fermion systems. Linear, inhomogeneous equations are obtained for properties of any order. A time-dependent formulation gives frequency-dependent properties, yielding excitation energies, transition probabilities, and (possibly) life times reminiscent of Green's function methods.
No takes yet. Share an insight, caveat, or question.
Hendrik J. Monkhorst (2009) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: