https://doi.org/10.1051/epjconf/202227402008
The static potential using trial states from Laplacian eigenmodes
1 Dept. of Physics, Bergische Universität Wuppertal, Gaußstrasse 20, 42119 Wuppertal, Germany
2 School of Mathematics, Trinity College, Dublin 2, Ireland
* e-mail: hoellwieser@uni-wuppertal.de
** e-mail: knechtli@uni-wuppertal.de
*** e-mail: mjp@maths.tcd.ie
Published online: 22 December 2022
We compute the static potential of a quark-antiquark pair in lattice QCD using a method which is not based on Wilson loops, but where the trial states are formed by eigenvector components of the covariant lattice Laplace operator. The computational effort of this method is significantly lower than the standard Wilson loop calculation, when computing the static potential not only for on-axis, but also for many off-axis quark-antiquark separations, i.e., when a fine spatial resolution is required, e.g., for string breaking calculations. We further improve the signal by using multiple eigenvector pairs, weighted with Gaussian profile functions of the eigenvalues, providing a basis for a generalized eigenvalue problem (GEVP), as it was recently introduced to improve distillation in meson spectroscopy. We show results from the new method for the static potential with dynamical fermions and demonstrate its efficiency compared to traditional Wilson loop calculations.
© The Authors, published by EDP Sciences, 2022
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
