Möbius domain-wall fermions on gradient-flowed dynamical HISQ ensembles

Evan Berkowitz, Chris Bouchard, Chia Cheng Chang (張家丞), M. A. Clark, Bálint Joó, Thorsten Kurth, Christopher Monahan, Amy Nicholson, Kostas Orginos, Enrico Rinaldi, Pavlos Vranas, and André Walker-Loud
Phys. Rev. D 96, 054513 – Published 25 September 2017

Abstract

We report on salient features of a mixed lattice QCD action using valence Möbius domain-wall fermions solved on the dynamical Nf=2+1+1 highly improved staggered quark sea-quark ensembles generated by the MILC Collaboration. The approximate chiral symmetry properties of the valence fermions are shown to be significantly improved by utilizing the gradient-flow scheme to first smear the highly improved staggered quark configurations. The greater numerical cost of the Möbius domain-wall inversions is mitigated by the highly efficient QUDA library optimized for NVIDIA GPU accelerated compute nodes. We have created an interface to this optimized QUDA solver in Chroma. We provide tuned parameters of the action and performance of QUDA using ensembles with the lattice spacings a{0.15,0.12,0.09}fm and pion masses mπ{310,220,130}  MeV. We have additionally generated two new ensembles with a0.12fm and mπ{400,350}MeV. With a fixed flow time of tgf=1 in lattice units, the residual chiral symmetry breaking of the valence fermions is kept below 10% of the light quark mass on all ensembles, mres0.1×ml, with moderate values of the fifth dimension L5 and a domain-wall height M51.3. As a benchmark calculation, we perform a continuum, infinite volume, physical pion and kaon mass extrapolation of FK±/Fπ± and demonstrate our results are independent of flow time and consistent with the FLAG determination of this quantity at the level of less than one standard deviation.

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  • Received 16 February 2017

DOI:https://doi.org/10.1103/PhysRevD.96.054513

© 2017 American Physical Society

Physics Subject Headings (PhySH)

Particles & Fields

Authors & Affiliations

Evan Berkowitz1,2, Chris Bouchard3,4, Chia Cheng Chang (張家丞)5, M. A. Clark6, Bálint Joó7, Thorsten Kurth8, Christopher Monahan9, Amy Nicholson10,5, Kostas Orginos4,11, Enrico Rinaldi12,2, Pavlos Vranas2,5, and André Walker-Loud5,2

  • 1Institut für Kernphysik and Institute for Advanced Simulation, Forschungszentrum Jülich, 54245 Jülich, Germany
  • 2Nuclear and Chemical Sciences Division, Lawrence Livermore National Laboratory, Livermore, California 94550, USA
  • 3School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom
  • 4Department of Physics, The College of William & Mary, Williamsburg, Virginia 23187, USA
  • 5Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
  • 6NVIDIA Corporation, 2701 San Tomas Expressway, Santa Clara, California 95050, USA
  • 7Scientific Computing Group, Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
  • 8NERSC, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
  • 9New High Energy Theory Center and Department of Physics and Astronomy, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854, USA
  • 10Department of Physics, University of California, Berkeley, California 94720, USA
  • 11Theory Center, Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
  • 12RIKEN-BNL Research Center, Brookhaven National Laboratory, Upton, New York 11973, USA

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Issue

Vol. 96, Iss. 5 — 1 September 2017

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