Large Gauge Transformations and the Light-Front Vacuum Structure

Details Large Gauge Transformations and the Light-Front Vacuum Structure Large Gauge Transformations and the Light-Front Vacuum Structure

1998-11-20

arxiv.org/abs/hep-th/9811182v1

Phys.Lett. B509 (2001) 355-364

Physics

High Energy Physics

High Energy Physics - Theory

10 pages, Latex

Scientific paper

10.1016/S0370-2693(01)00507-X

A residual gauge symmetry, exhibited by light-front gauge theories quantized in a finite volume, is analyzed at the quantum level. Unitary operators, which implement the symmetry, transform the trivial Fock vacuum into an infinite set of degenerate coherent-state vacua. A fermionic component of the vacuum emerges naturally without the need to introduce a Dirac sea. The vacuum degeneracy along with the derivation of the theta-vacuum is discussed within the massive Schwinger model. A possible generalization of the approach to more realistic gauge theories is suggested.

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