Suppressing dislocations in normalized hypercubic smearing

Abstract

Normalized hypercubic smearing improves the behavior of dynamical Wilson-clover fermions, but has the unwanted side effect that it can occasionally produce spikes in the fermion force. These spikes originate in the chain rule connecting the derivative with respect to the smeared links to the derivative with respect to the dynamical links, and are associated with the presence of dislocations in the dynamical gauge field. We propose and study an action designed to suppress these dislocations. We present evidence for improved performance of the hybrid Monte Carlo algorithm. A side benefit is improvement in the properties of valence chiral fermions.

Revtex, 10 pages, 2 figures

References in corpus (7)

• Scaling studies of QCD with the dynamical HISQ action
• Rationale for UV-filtered clover fermions
• Lattice gauge action suppressing near-zero modes of H_W
• Gap Domain Wall Fermions
• Localization and chiral symmetry in 2+1 flavor domain wall QCD
• Improvement via hypercubic smearing in triplet and sextet QCD
• Scaling study for 2 HEX smeared fermions: hadron and quark masses