منابع مشابه
Continuum physics with overlap fermions
We calculate mud =(mu+md)/2, ms, fπ and fK in the quenched continuum limit with UV-filtered overlap fermions. We see rather small scaling violations on lattices as coarse as a ≃ 1GeV and conjecture that similar advantages would be manifest in unquenched studies.
متن کاملTopology with Dynamical Overlap Fermions
We perform dynamical QCD simulations with nf = 2 overlap fermions by hybrid Monte-Carlo method on 64 to 83 × 16 lattices. We study the problem of topological sector changing. A new method is proposed which works without topological sector changes. We use this new method to determine the topological susceptibility at various quark masses.
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Numerical evaluation of the overlap Dirac operator is difficult since it contains the sign function e(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...
متن کاملUV-filtered overlap fermions
We discuss the kernel spectrum, locality properties and the axial-vector renormalization constant of UV-filtered overlap fermions. We find that UV-filtered overlap fermions have a better conditioned kernel, better locality and an axial-vector renormalization constant closer to 1 than their unfiltered counterparts, even if the shift parameter ρ is simply set to 1.
متن کاملTruncated Overlap Fermions
After many years of research in lattice QCD, it was possible to formulate QCD with chiral fermions on the lattice [1–4]. The basic idea is an expanded flavor space which may be seen as an extra dimension with left and right handed fermions defined in the two opposite boundaries or walls. Let N be the size of the extra dimension, DW the Wilson-Dirac operator, and m the bare fermion mass. Then, t...
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ژورنال
عنوان ژورنال: Nuclear Physics A
سال: 2014
ISSN: 0375-9474
DOI: 10.1016/j.nuclphysa.2014.02.022