12 citations · 18 across the 8 of their papers we have counts for
3 papers · 1 filter
Small distance behavior of one-particle Green's functions in electronic structure theory
Heinz-Juergen Flad, Michael Griebel
Within the framework of many-particle perturbation theory, we develop an analytical approach that allows us to determine the small distance behavior of Green's functions and relate…
Singular analysis of RPA diagrams in coupled cluster theory
Heinz-Jürgen Flad, Gohar Flad-Harutyunyan
Coupled cluster theory provides hierarchical many-particle models and is presently considered as the ultimate benchmark in quantum chemistry. Despite is practical significance, a r…
Explicit Green operators for quantum mechanical Hamiltonians.~II.~ Edge type singularities of the helium atom
Heinz-Juergen Flad, Gohar Flad-Harutyunyan, Bert-Wolfgang Schulze
We extend our approach of asymptotic parametrix construction for Hamiltonian operators from conical to edge-type singularities which is applicable to coalescence points of two part…