PoS - Proceedings of Science
Volume 453 - The 40th International Symposium on Lattice Field Theory (LATTICE2023) - Tests of Fundamental Symmetries
The Thirring Model in 2+1d with Optimised Domain Wall Fermions
S. Hands* and J. Worthy
Full text: pdf
Pre-published on: December 27, 2023
Published on:
Abstract
After briefly reviewing the potential for the $N$-flavor Thirring
model, formulated with reducible fermions in 2+1$d$, to exhibit a
strongly-coupled UV-stable fixed point where U($2N$) symmetry is spontaneously broken
by a fermion bilinear condensate, we present recent lattice studies
using the Domain Wall Fermion formulation. In particular, we focus on possible
improved methods for extracting the necessary $L_s\to\infty$ limit, where $L_s$ is the wall
separation, through a combination of partial
quenching (ie. $L_s({\rm valence})>L_s({\rm sea})$), replacing the Shamir kernel
with the Wilson kernel in the definition of the overlap operator, and improved
estimation of the signum function using the Zolotarev approximation. Equation of
state fits for critical exponents
on $12^3$ systems yield encouraging agreement between
distinct approaches, consistent with universal scaling, while contradicting earlier fits based on a naive
extrapolation. The new results are also in tension with old results obtained with
staggered fermions.
DOI: https://doi.org/10.22323/1.453.0338
How to cite

Metadata are provided both in "article" format (very similar to INSPIRE) as this helps creating very compact bibliographies which can be beneficial to authors and readers, and in "proceeding" format which is more detailed and complete.

Open Access
Creative Commons LicenseCopyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.