Evaluation of disconnected quark loops for hadron structure using GPUs

A number of stochastic methods developed for the calculation of fermion loops are investigated and compared, in particular with respect to their efficiency when implemented on Graphics Processing Units (GPUs). We assess the performance of the various methods by studying the convergence and statistic...

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Bibliographic Details
Published inComputer physics communications Vol. 185; no. 5; pp. 1370 - 1382
Main Authors Alexandrou, C., Constantinou, M., Drach, V., Hadjiyiannakou, K., Jansen, K., Koutsou, G., Strelchenko, A., Vaquero, A.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.05.2014
Subjects
Computational efficiency
Convergence
Fermions
Graphics processing units
Hadron physics
Lattice QCD
Mathematical analysis
Noise
Nucleons
Stochasticity
Lattice QCD
Hadron physics
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Summary:A number of stochastic methods developed for the calculation of fermion loops are investigated and compared, in particular with respect to their efficiency when implemented on Graphics Processing Units (GPUs). We assess the performance of the various methods by studying the convergence and statistical accuracy obtained for observables that require a large number of stochastic noise vectors, such as the isoscalar nucleon axial charge. The various methods are also examined for the evaluation of sigma-terms where noise reduction techniques specific to the twisted mass formulation can be utilized thus reducing the required number of stochastic noise vectors.
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:0010-4655
1879-2944
DOI:10.1016/j.cpc.2014.01.009