UV-filtered overlap fermions

TL;DR

This paper investigates UV-filtered overlap fermions, demonstrating improved kernel conditioning, locality, and axial-vector renormalization constants closer to unity compared to unfiltered versions, enhancing lattice QCD simulations.

Contribution

It provides a detailed analysis of UV-filtered overlap fermions, highlighting their improved properties over unfiltered overlap fermions, especially in kernel conditioning and locality.

Findings

Better conditioned kernel with UV filtering

Enhanced locality properties

Axial-vector renormalization constant closer to 1

Abstract

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 $\rho$ is simply set to 1.