Evaluation of disconnected quark loops for hadron structure using GPUs

C. Alexandrou, M. Constantinou, V. Drach, K. Hadjiyiannakou, K. Jansen, G. Koutsou, A. Strelchenko, A. Vaquero
Department of Physics, University of Cyprus, P.O. Box 20537, 1678 Nicosia, Cyprus
arXiv:1309.2256 [hep-lat], (9 Sep 2013)


   author={Alexandrou}, C. and {Constantinou}, M. and {Drach}, V. and {Hadjiyiannakou}, K. and {Jansen}, K. and {Koutsou}, G. and {Strelchenko}, A. and {Vaquero}, A.},

   title={"{Evaluation of disconnected quark loops for hadron structure using GPUs}"},

   journal={ArXiv e-prints},




   keywords={High Energy Physics – Lattice, Nuclear Theory},




   adsnote={Provided by the SAO/NASA Astrophysics Data System}


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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.
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