https://doi.org/10.1140/epjc/s10052-020-8077-5
Regular Article - Theoretical Physics
The confining color field in SU(3) gauge theory
1
Department of Physics, University of Washington, Seattle, WA, 98105, USA
2
INFN, Sezione di Bari, 70126, Bari, Italy
3
INFN, Gruppo Collegato di Cosenza, Arcavacata di Rende, 87036, Cosenza, Italy
4
On leave of absence from Bogolyubov Institute for Theoretical Physics of the National Academy of Sciences of Ukraine, Kiev, Ukraine
5
Institut für Theoretische Physik, Goethe Universität, 60438, Frankfurt am Main, Germany
6
Dipartimento di Fisica, Università della Calabria, Arcavacata di Rende, 87036, Cosenza, Italy
* e-mail: cuteri@th.physik.uni-frankfurt.de
Received:
16
December
2019
Accepted:
23
May
2020
Published online:
8
June
2020
We extend a previous numerical study of SU(3) Yang–Mills theory in which we measured the spatial distribution of all components of the color fields surrounding a static quark–antiquark pair and provided evidence that the simulated gauge invariant chromoelectric field can be separated into a Coulomb-like ‘perturbative’ field and a ‘non-perturbative’ confining field. In this paper we hypothesize that the fluctuating color fields not measured in our simulations do not contribute to the string tension. Under this assumption the string tension is determined by the color fields we measure, which form a field strength tensor pointing in a single direction in color space. We call this the ‘Maxwell picture of confinement’. We provide an additional procedure to isolate the confining field. We then extract the string tension from a stress energy-momentum tensor having the Maxwell form, constructed from the simulated non-perturbative part of the field strength tensor. To test our hypothesis we calculate the string tension for values of the quark–antiquark separation ranging from 0.37 fm to 1.2 fm. We also calculate the spatial distributions of the energy-momentum tensor surrounding static quarks for this range of separations, and we compare with the distributions obtained from direct simulations of the energy-momentum tensor.
© The Author(s), 2020
