Journal
PHYSICAL REVIEW D
Volume 104, Issue 3, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.104.034502
Keywords
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Funding
- Office of Science of the U.S. Department of Energy [DE-AC05-00OR22725]
- Office of Science of the U.S. Department of Energy
- PRACE Research Infrastructure resource Marconi at Cineca, Italy [2016163877]
- U.S. Department of Energy, Office of Science, Office of Nuclear Physics [DE-SC0011090]
- U.S. Department of Energy, Office of Science, Office of Nuclear Physics
- SciDAC4 Award [DE-SC0018121]
- U.S. Department of Energy [DE-FG02-00ER41132.]
- National Science Foundation [1841699]
- MIT Pappalardo Fellowship
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The propagator sparsening algorithm reduces computational cost by constructing correlation functions from sparsened propagators defined on a coarsened lattice geometry. When studying the low-energy QCD ground-state spectrum, the extracted ground state masses and binding energies are consistent when determined from correlation functions constructed from sparsened and full propagators.
Modern advances in algorithms for lattice QCD calculations have steadily driven down the resources required to generate gauge field ensembles and calculate quark propagators, such that, in cases relevant to nuclear physics, performing quark contractions to assemble correlation functions from propagators has become the dominant cost. This work explores a propagator sparsening algorithm for forming correlation functions describing multihadron systems, such as light nuclei, with reduced computational cost. The algorithm constructs correlation functions from sparsened propagators defined on a coarsened lattice geometry, where the sparsened propagators are obtained from propagators computed on the full lattice. This algorithm is used to study the low-energy QCD ground-state spectrum using a single Wilson-clover lattice ensemble with m(n) approximate to 800 MeV. It is found that the extracted ground state masses and binding energies, as well as their statistical uncertainties, are consistent when determined from correlation functions constructed from sparsened and full propagators. In addition, while evidence of modified couplings to excited states is observed in sparsened correlation functions, it is demonstrated that these effects can be removed, if desired, with an inexpensive modification to the sparsened estimator.
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