Accelerated overlap fermions

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dc.contributor.authorKamleh, W.
dc.contributor.authorAdams, D.
dc.contributor.authorLeinweber, D.
dc.contributor.authorWilliams, A.
dc.contributor.organisationSpecial Research Centre for the Subatomic Structure of Matter
dc.date.issued2002
dc.description.abstractNumerical evaluation of the overlap Dirac operator is difficult since it contains the sign function ε(Hw) of the Hermitian Wilson-Dirac operator Hw with a negative mass term. The problems are due to Hw having very small eigenvalues on the equilibrium background configurations generated in current day Monte Carlo simulations. Since these are a consequence of the lattice discretization and do not occur in the continuum version of the operator, we investigate in this paper to what extent the numerical evaluation of the overlap can be accelerated by making the Wilson-Dirac operator more continuum-like. Specifically, we study the effect of including the clover term in the Wilson-Dirac operator and smearing the link variables in the irrelevant terms. In doing so, we have obtained a factor of 2 speedup by moving from the Wilson action to a fat link irrelevant clover action as the overlap kernel.
dc.description.statementofresponsibilityWaseem Kamleh, David H. Adams, Derek B. Leinweber, and Anthony G. Williams
dc.identifier.citationPhysical Review D: Particles, Fields, Gravitation and Cosmology, 2002; 66(1):014501-1-014501-9
dc.identifier.doi10.1103/PhysRevD.66.014501
dc.identifier.issn1550-7998
dc.identifier.issn0556-2821
dc.identifier.orcidKamleh, W. [0000-0002-6177-5366]
dc.identifier.orcidLeinweber, D. [0000-0002-4745-6027]
dc.identifier.orcidWilliams, A. [0000-0002-1472-1592]
dc.identifier.urihttp://hdl.handle.net/2440/11133
dc.language.isoen
dc.publisherAmerican Physical Soc
dc.rights© 2002 American Physical Society
dc.source.urihttps://doi.org/10.1103/physrevd.66.014501
dc.titleAccelerated overlap fermions
dc.typeJournal article
pubs.publication-statusPublished

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