FLIC-Overlap Fermions and Topology
Abstract
APE smearing the links in the irrelevant operators of clover fermions (Fat-Link Irrelevant Clover (FLIC) fermions) provides significant improvement in the condition number of the Hermitian-Dirac operator and gives rise to a factor of two savings in computing the overlap operator. This report investigates the effects of using a highly-improved definition of the lattice field-strength tensor F_mu_nu in the fermion action, made possible through the use of APE-smeared fat links in the construction of the irrelevant operators. Spurious double-zero crossings in the spectral flow of the Hermitian-Wilson Dirac operator associated with lattice artifacts at the scale of the lattice spacing are removed with FLIC fermions composed with an O(a^4)-improved lattice field strength tensor. Hence, FLIC-Overlap fermions provide an additional benefit to the overlap formalism: a correct realization of topology in the fermion sector on the lattice.
Keywords
Cite
@article{arxiv.hep-lat/0209156,
title = {FLIC-Overlap Fermions and Topology},
author = {W. Kamleh and D. J. Kusterer and D. B. Leinweber and A. G. Williams},
journal= {arXiv preprint arXiv:hep-lat/0209156},
year = {2010}
}
Comments
Lattice2002(chiral)