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Electric polarizability of hadrons with overlap fermions on multi-GPUs

Michael Lujan, Andrei Alexandru, Frank Lee
The George Washington University, Washington DC, USA
arXiv:1111.6288v1 [hep-lat] (27 Nov 2011)

@article{2011arXiv1111.6288L,

   author={Lujan, Michael and Alexandru, Andrei and Lee, Frank},

   title={"{Electric polarizability of hadrons with overlap fermions on multi-GPUs}"},

   journal={ArXiv e-prints},

   archivePrefix={"arXiv"},

   eprint={1111.6288},

   primaryClass={"hep-lat"},

   keywords={High Energy Physics – Lattice},

   year={2011},

   month={nov}

}

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Electric polarizability is an important parameter for the internal structure of hadrons. Previous studies of polarizabilities have been done at relatively heavy pion masses, leaving the chiral region largely unexplored. In this report, we use overlap fermions which are known to be computationally demanding to properly capture the chiral dynamics. We present an implementation strategy to construct overlap on multi-GPUs. We find that our GPU code has an equivalent of sim30 CPU cores to 1 GPU. We also present preliminary results for the polarizability of the neutral pion.
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