On the temporal Wilson loop in the Hamiltonian approach in Coulomb gauge

Details On the temporal Wilson loop in the Hamiltonian approach in Coulomb gauge On the temporal Wilson loop in the Hamiltonian approach in Coulomb gauge

2011-10-13

arxiv.org/abs/1110.2927v2

Physics

High Energy Physics

High Energy Physics - Theory

24 pages, 4 eps-figures; new version matches published one

Scientific paper

We investigate the temporal Wilson loop using the Hamiltonian approach to Yang-Mills theory. In simple cases such as the Abelian theory or the non-Abelian theory in (1+1) dimensions, the known results can be reproduced using unitary transformations to take care of time evolution. We show how Coulomb gauge can be used for an alternative solution if the exact ground state wave functional is known. In the most interesting case of Yang-Mills theory in (3+1) dimensions, the vacuum wave functional is not known, but recent variational approaches in Coulomb gauge give a decent approximation. We use this formulation to compute the temporal Wilson loop and find that the Wilson and Coulomb string tension agree within our approximation scheme. Possible improvements of these findings are briefly discussed.

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