期刊
PHYSICS LETTERS B
卷 811, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.physletb.2020.135911
关键词
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资金
- Alexander von Humboldt Foundation
We discuss aspects of non-perturbative unitarity in quantum field theory. The additional ghost degrees of freedom arising in truncations of an effective action at a finite order in derivatives could be fictitious degrees of freedom. Their contributions to the fully-dressed propagator - the residues of the corresponding ghost-like poles - vanish once all operators compatible with the symmetry of the theory are included in the effective action. These fake ghosts do not indicate a violation of unitarity. (C) 2020 The Author(s). Published by Elsevier B.V.
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