Improving the efficiency of the multireference driven similarity renormalization group via sequential transformation, density fitting, and the non-interacting virtual orbital approximation.
Sign Up to like & getrecommendations! Published in 2019 at "Journal of chemical theory and computation"
DOI: 10.1021/acs.jctc.9b00353
Abstract: This study examines several techniques to improve the efficiency of the linearized multireference driven similarity renormalization group truncated to one- and two-body operators [MR-LDSRG(2)]. We propose a sequential MR-LDSRG(2) [sq-MR-LDSRG(2)] approach, in which one-body substitutions… read more here.
Keywords: similarity renormalization; multireference; renormalization group; approximation ... See more keywords
Operator evolution from the similarity renormalization group and the Magnus expansion
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DOI: 10.1103/physrevc.102.034005
Abstract: The Magnus expansion is an efficient alternative to solving similarity renormalization group (SRG) flow equations with high-order, memory-intensive ordinary differential equation solvers. The numerical simplifications it offers for operator evolution are particularly valuable for in-medium… read more here.
Keywords: operator evolution; similarity renormalization; renormalization group; magnus expansion ... See more keywords
Importance truncation for the in-medium similarity renormalization group
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DOI: 10.1103/physrevc.105.034324
Abstract: Ab initio nuclear many-body frameworks require extensive computational resources, especially when targeting heavier nuclei. Importance-truncation (IT) techniques allow one to significantly reduce the dimensionality of the problem by neglecting unimportant contributions to the solution of… read more here.
Keywords: medium similarity; importance truncation; renormalization group; similarity renormalization ... See more keywords
Nonrelativistic expansion of Dirac equation with spherical scalar and vector potentials by similarity renormalization group
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DOI: 10.1103/physrevc.99.054324
Abstract: By following the conventional similarity renormalization group (SRG) expansion of the Dirac equation developed in [J.-Y. Guo, Phys. Rev. C \textbf{85}, 021302 (2012)], we work out the analytic expression of the ${1}/{M^4}$ order and verify… read more here.
Keywords: similarity renormalization; expansion dirac; renormalization group; dirac equation ... See more keywords