2+1 flavor QCD simulation on a $96^4$ lattice

Ishikawa, K-I.; Ishizuka, N.; Kuramashi, Y.; Nakamura, Y.; Namekawa, Yusuke; Taniguchi, Yusuke; Ukita, N.; Yamazaki, Takahiro; Yoshié, T.

doi:10.48550/arxiv.1511.09222

Cited by 22 publications

(23 citation statements)

References 10 publications

(14 reference statements)

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“…The gauge configurations in 2+1 flavor QCD with the stout-smeared O(a)-improved Wilson-clover quark action and the Iwasaki gauge action [39] on an N 3 s × N t = 128 3 × 128 lattice at β = 1.82, which corresponds to a (10.8 fm) 4 physical space-time with a lattice cutoff of a −1 = 2.333 (18) GeV (a = 0.08457(67) fm) [40] have been generated by PACS Collaboration. The Schrödinger functional (SF) scheme is employed to determine the nonperturbative improvement coefficient c SW = 1.11 [41].…”

Section: A Pacs10 Configurationsmentioning

confidence: 99%

Nucleon form factors and root-mean-square radii on a (10.8 fm)4 lattice at the physical point

et al. 2019

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We present the nucleon form factors and root-mean-square (RMS) radii measured on a (10.8 fm) 4 lattice at the physical point. We compute the form factors at small momentum transfer region in q 2 ≤ 0.102 GeV 2 with the standard plateau method choosing four source-sink separation times tsep from 0.84 to 1.35 fm to examine the possible excited state contamination. We obtain the electric and magnetic form factors and their RMS radii for not only the isovector channel but also the proton and neutron ones without the disconnected diagram. We also obtain the axial-vector coupling and the axial radius from the axial-vector form factor. We find that these three form factors do not show large tsep dependence in our lattice setup, and those RMS radii are consistent with the experimental values. On the other hand, the induced pseudoscalar and pseudoscalar form factors show the clear effects of the excited state contamination, which affect the generalized Goldberger-Treiman relation.

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Section: A Pacs10 Configurationsmentioning

confidence: 99%

Nucleon form factors and root-mean-square radii on a (10.8 fm)4 lattice at the physical point

et al. 2019

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“…Through advances in computational power, the lattice QCD community has achieved the long term goal of performing dynamical simulations at or near the physical point, see e.g. [1][2][3][4][5], using techniques based on the Hybrid Monte Carlo (HMC) algorithm [6]. Nonetheless, the task of generating gauge fields with light quarks remains numerically intensive, requiring access to primary tier supercomputing resources.…”

Section: Introductionmentioning

confidence: 99%

Single flavour optimisations to Hybrid Monte Carlo

Haar

Kamleh

Zanotti

et al. 2019

Computer Physics Communications

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It has become increasingly important to include one or more individual flavours of dynamical fermion in lattice QCD simulations. This is due in part to the advent of QCD+QED calculations, where isospin symmetry breaking means that the up, down, and strange quarks must be treated separately. These single-flavour pseudofermions are typically implemented as rational approximations to the inverse of the fermion matrix, using the technique known as Rational Hybrid Monte Carlo (RHMC). Over the years, a wide range of methods have been developed for accelerating simulations of two degenerate flavours of pseudofermion, while there are comparatively fewer such techniques for single-flavour pseudofermions. Here, we investigate two different filtering methods that can be applied to RHMC for simulating single-flavour pseudofermions, namely polynomial filtering (PF-RHMC), and filtering via truncations of the ordered product (tRHMC). A novel integration step-size tuning technique based on the characteristic scale is also introduced. Studies are performed on two different lattice volumes, demonstrating that one can achieve significant reductions in the computational cost of single-flavour simulations with these filtering techniques.

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“…Numerical data used in this study are obtained from the (2 + 1)-flavor gauge configurations with Iwasaki gauge action at 𝛽 = 1.82 and nonperturbatively 𝑂 (𝑎)-improved Wilson quark action with stout smearing at nearly physical quark masses [12]. The relativistic heavy quark (RHQ) action is used for the charm quark to remove cutoff errors associated with the charm quark mass up to next-toleading order, with RHQ parameters determined in Ref.…”

Section: Lattice Qcd Setupmentioning

confidence: 99%

Finite volume analysis on systematics of the derivative expansion in HAL QCD method

Doi¹,

Liu²,

Tong³

et al. 2021

Preprint

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2+1 flavor QCD simulation on a $96^4$ lattice

Cited by 22 publications

References 10 publications

Nucleon form factors and root-mean-square radii on a (10.8 fm)4 lattice at the physical point

Nucleon form factors and root-mean-square radii on a (10.8 fm)4 lattice at the physical point

Single flavour optimisations to Hybrid Monte Carlo

Finite volume analysis on systematics of the derivative expansion in HAL QCD method

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