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cond-mat.str-el2025
CoS++: Towards More General and Explicit Implementations for Sampling High-Order Feynman Diagrammatic Series
Boyuan Shi
We extend combinatorial summation (CoS) of connected Feynman diagrams to Hubbard mod- els with flavor-dependent propagators and counterterm shifts. The construction combines an int…
cond-mat.str-el2025
Fast summation of fermionic Feynman diagrams beyond Bravais Lattices and on-site Hubbard interactions
Boyuan Shi
We designed new algorithms for summing bold-line Feynman diagrams in arbitrary channels, where it can be readily modified for bare interaction series as well. When applied to magne…