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

Berkowitz, E. et al. (2017) Möbius domain-wall fermions on gradient-flowed dynamical HISQ ensembles. Physical Review D, 96(5), 054513. (doi: 10.1103/PhysRevD.96.054513)

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Abstract

We report on salient features of a mixed lattice QCD action using valence Möbius domain-wall fermions solved on the dynamical N f = 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 m π ≃ { 310 , 220 , 130 }    MeV . We have additionally generated two new ensembles with a ∼ 0.12     fm and m π ∼ { 400 , 350 }     MeV . With a fixed flow time of t g f = 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, m res ≲ 0.1 × m l , with moderate values of the fifth dimension L 5 and a domain-wall height M 5 ≤ 1.3 . As a benchmark calculation, we perform a continuum, infinite volume, physical pion and kaon mass extrapolation of F K ± / F π ± 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.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Bouchard, Dr Chris
Authors: Berkowitz, E., Bouchard, C., Chang, C. C., Clark, M. A., Joó, B., Kurth, T., Monahan, C., Nicholson, A., Orginos, K., Rinaldi, E., Vranas, P., and Walker-Loud, A.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Physical Review D
Publisher:American Physical Society
ISSN:2470-0010
ISSN (Online):2470-0029
Published Online:25 September 2017
Copyright Holders:Copyright © 2017 American Physical Society
First Published:First published in Physical Review D 96(5): 054513
Publisher Policy:Reproduced in accordance with the publisher copyright policy

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