منابع مشابه
Constructing Improved Overlap Fermions in QCD
We describe an explicit construction of approximate Ginsparg-Wilson fermions for QCD. We use ingredients of perfect action origin, and further elements. The spectrum of the lattice Dirac operator reveals the quality of the approximation. We focus on β = 6 for optimisation. Such fermions are intended to be inserted into the overlap formula. Hence we also test the speed of convergence under polyn...
متن کاملConvergence Rate and Locality of Improved Overlap Fermions
We construct new Ginsparg-Wilson fermions for QCD by inserting an approximately chiral Dirac operator — which involves ingredients of a perfect action — into the overlap formula. This accelerates the convergence of the overlap Dirac operator by a factor of 5 compared to the standard construction, which inserts the Wilson fermion as a point of departure. In addition the level of locality is clea...
متن کاملAccelerated overlap fermions
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...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Nuclear Physics B - Proceedings Supplements
سال: 2000
ISSN: 0920-5632
DOI: 10.1016/s0920-5632(00)00328-5