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Updates to the QCDml and sharing quark propagators

Updates to the QCDml and sharing quark propagators. two revisions to QCDml new actions overlap quark + topology fixing (JLQCD) twisted mass quark for non-degenerate doublets (ETM) clover quark with stout link smearing (QCDSF) new tag <replicate> discussions on sharing quark propagators.

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Updates to the QCDml and sharing quark propagators

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  1. Updates to the QCDml and sharing quark propagators • two revisions to QCDml • new actions • overlap quark + topology fixing(JLQCD) • twisted mass quark for non-degenerate doublets (ETM) • clover quark with stout link smearing (QCDSF) • new tag <replicate> discussions on sharing quark propagators ILDG12 (May.23,2008) T. Yoshie for MDWG CCS,Tsukuba

  2. Updates to the QCDml QCDmlEnsemble1.4.3 (May 11th) QCDmlEnsemble1.4.4 (May 19th)

  3. Overlap quark overlap operator Hermitian wilson kernel with negative mass approximation of the sign function

  4. markup minimal set of information for sign function approximation, because • sign function approximation affects the physics • N5 is marked up for domain wall quark action • plan to support various formulae when they become necessary • currently, one choice, approximation with the Zolotarev rational polynomial • approx. formulae are in general applied for a spectrum range • threshold • number of eigenmodes

  5. specify threshold <zolotarevSignApprox> <threshold> <min>-0.05</min> <max> 0.05</max> <method>eigenmode</method> </threshold> <nPole>10</nPole> </zolotarevSignApprox> all eigenmodes in [-0.05,0.05] are identified and the sign function is treated exactly for the range. Zolotarev function is applied outside the threshold range, i.e. (-L,-0.05) and (0.05,U) nPole: number of poles • Note: • Lower/Upper bounds (L/U) of the Zolotarev function are • not marked up. (They are configuration dependent) • <method> is either “eigenmode” or “ignore”

  6. specify number of eigenmodes <zolotarevSignApprox> <nEigenmode>1<nEigenmode> <nPole>variable</nPole> </zolotarevSignApprox> eigenvalues are identified and the Zolotarev formula is applied for the range • Note: • Upper-bound (U) of the Zolotarev approx. is not marked • up. (It is configuration dependent) • <nPole> is either positive integer or “variable”

  7. Topology Fixing • overlap quark simulation is often accompanied with topology fixing • insert an optional block <topologyFixing> in gluon action section <iwasakiRGGluonAction> <glossary/> <gluonField/> <topologyFixing> </topologyFixing> <beta>2.30</beta> <normalisation>cs_sum_to_one</normalisation> <c0>3.648</c0> <c1>-0.331</c1> <c2>0.0</c2> <c3>0.0</c3> </iwasakiRGGluonAction> topology fixing block

  8. topology fixing is often realized by multiplying the Boltzman weight by a fermion determinant which vanishes for zero eigenmodes. twisted mass ghost with Wilson kernel

  9. integer

  10. mass twist is in direction mass split is in direction Twisted Mass Mass Split action • a request from the ETM collab. • to markup their Nf=2+1+1 ensembles • usual twisted mass quark for degenerate doubles (already marked up) • TM with mass splitting term for 1+1 part numberOfFlavours: multiple of two

  11. NP clover quark with stout link • a request from the QCDSF Collab. for SLiNC • clover quark action with stout smeared links only for derivative terms • Csw determined non-perturbatively • no new parameter is necessary, just assign a new name <fatLinkDerivNpCloverQuarkAction> <glossary/> <quarkField/> <numberOfFlavours>2</numberOfFlavours> <linkSmearing> <apeLinkBlocking> <rho0>0.0</rho0> <rho1>0.1</rho1> </apeLinkBlocking> <stoutLinkUnitarization/> <numSmear>1</numSmear> </linkSmearing> <kappa>0.1340</kappa> <cSW>1.68</cSW> </fatLinkDerivNpCloverQuarkAction>

  12. <replicate> • file replication will be proposed by MWWG • new tag <replicate> in the management section of ensemble XML • allow : allow replication • deny : not allow replication • <replicate> is optional. If it does not exist, MW interprets that replication is not allowed. <management> <collaboration/> <projectName/> <ensembleLabel/> <publishedAlias/> <archiveHistory/> <replicate>allow</replicate> </management>

  13. Sharing Quark Propagators WG agrees to work for propagator sharing Everything is still under discussion

  14. Collaboration Status plans • RBC/UKQCD/LHPC plan to share propagators with each other • ETMC plan to share propagators • Japan has no plan at this moment file/binary format • USQCD has several standards • ETMC has a standard

  15. Data Metadata required • propagator (Data) • Wilson, KS, DW …. • source (Data) or source type (Metadata) • gamma matrix convention (Metadata) • used file format (Metadata) • standardize several formats • reference to conf. i.e. dataLFN (Metadata) • prototype schemata by C.M. • face-to-face meeting ?

  16. Metadata Working Group G.Andronico (INFN) P.Coddington (Adelaide) C.DeTar (Utah) R.Edwards (JLAB) B.Joo (JLAB) C.Maynard (Edinburgh) D.Pleiter (NIC/DESY) J.Simone (FNAL) T.Yoshie (Tsukuba) Concluding Remarks • Latest version of QCDml (Ensemble1.4.4) meets all community requirements • visit http://www.ccs.tsukuba.ac.jp/ILDG to get a sample, which shows you all new features • Propagator sharing still under discussion

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