Poincare' Symmetry of the GZ-Model
arXiv:1501.05974 · doi:10.1103/PhysRevD.92.025002
Abstract
Due to internal symmetries of its ghost sector, the Poincare' generators of the GZ-model are not unique. The model apparently has two linearly independent symmetric and conserved energy momentum tensors. We show that these energy-momentum tensors are physically equivalent and differ by unobservable conserved currents only. There is a single physical energy-momentum operator that is invariant under all symmetries of the ghost sector, including BRST. This resolves concerns about Poincare' invariance raised by the explicit -dependence of the BRST operator. The energy, momentum and angular momentum of physical states are well-defined quantities that vanish for the ground state of this theory. We obtain and discuss the physical Ward identities resulting from Poincare' invariance.
31 pages. Corrected version published under the title "Living with Spontaneously Broken BRST Symmetry. II. Poincaré" in Phys. Rev. D
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