a status report of the qcdsf n f =2+1 project yoshifumi nakamura (nic/desy) for the qcdsf...
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![Page 1: A status report of the QCDSF N f =2+1 Project Yoshifumi Nakamura (NIC/DESY) for the QCDSF collaboration Lattice 2007 @ Regensburg Aug. 3, 2007](https://reader036.vdocuments.net/reader036/viewer/2022070416/56649d6a5503460f94a47c5e/html5/thumbnails/1.jpg)
A status report of the QCDSF Nf=2+1 Project
Yoshifumi Nakamura (NIC/DESY)for the QCDSF collaboration
Lattice 2007 @ RegensburgAug. 3, 2007
![Page 2: A status report of the QCDSF N f =2+1 Project Yoshifumi Nakamura (NIC/DESY) for the QCDSF collaboration Lattice 2007 @ Regensburg Aug. 3, 2007](https://reader036.vdocuments.net/reader036/viewer/2022070416/56649d6a5503460f94a47c5e/html5/thumbnails/2.jpg)
Introduction
QCDSF
Motivation:
QCDSF Collaboration has performed simulations of lattice QCD with 2 flavors of dynamical quarks
Real world: 6 flavors (3 light, 3 heavy) We want to deal with u, d and s quark dynamically
Expectation:
Improve:the hadron and quark massesweak matrix elementMoments of generalized distributions ・ ・ ・ ・ ・
lattice 2007
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Action
QCDSF lattice 2007
Gauge: Improved gauge action
Tadpole improved Symanzik glue:
decrease O(a2) lattice discretization error
(Nf=3)HPQCD
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Action
QCDSF
Fermion: Clover fermion action with stout links(FLRC)
better chiral propertiessmaller cut-off effects
Mild form of UV filtering:
lattice 2007
Morningstar & Peardon
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Algorithm
QCDSF
Partition function
Even odd preconditioning
lattice 2007
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Algorithm
QCDSF
Multi mass preconditioning
We modify action
lattice 2007
Hasenbusch
Horváth, Kennedy & Sint
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Algorithm
QCDSF
Multiple time integration scheme:
lattice 2007
3 time scalesSexton & Weingarten
Chronological inverter by Minimal Residual Extrapolation:Brower et al., NPB484
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Algorithm test
QCDSF lattice 2007
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Test
QCDSF lattice 2007
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Partially quenched
QCDSF lattice 2007
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Partially quenched
QCDSF lattice 2007
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Vector meson
QCDSF lattice 2007
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Nucleon
QCDSF lattice 2007
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QCDSF lattice 2007
Our 2+1 flavors action is more continuum like than our 2 flavors
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Conclusion
QCDSF
QCDSF 2+1 project startedWe did good choice for action
lattice 2007
Plan:
TODO: More elaborate tests Implementing new idea
Performance: ~20% of peak @Altix 20-25% of peak @BGL
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RHMC
QCDSF
optimal coefficients are found by the Remez algorithm for a given range
MC step
MD step
lattice 2007
Horváth, Kennedy & Sint