# New $N_f=2$ Pseudofermion Action for Monte-Carlo Simulation of Lattice Field Theory with Domain-Wall Fermions

## TL;DR

This paper introduces a new pseudofermion action for Monte-Carlo simulations of lattice gauge theories with domain-wall fermions, improving efficiency especially for large Nf and strong coupling regimes.

## Contribution

A novel Nf=2 pseudofermion action is constructed, linking the effective Dirac operator to the overlap-Dirac operator for improved lattice gauge theory simulations.

## Key findings

- Effective for large Nf=2n DWF simulations
- Suitable for large lattices and strong coupling regimes
- Enhances computational efficiency in lattice gauge theory

## Abstract

We construct a novel $ N_f = 2 $ pseudofermion action for Monte-Carlo simulation of lattice gauge theory with domain-wall fermions (DWF), of which the effective four-dimensional lattice Dirac operator is equal to the overlap-Dirac operator with the argument of the sign function equal to $ H = c \gamma_5 D_w (1 + d D_w)^{-1} $, where $ c $ and $ d $ are parameters, and $D_w$ is the standard Wilson-Dirac operator plus a negative parameter $-m_0 \; (0 < m_0 < 2)$. This new action is particularly useful for the challenging simulations of lattice gauge theories with large $N_f = 2n $ DWF, on the large lattices, and in the strong-coupling regime.