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math-ph2018★ 2 cited
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…
math-ph2018
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…