Non-perturbative unitarity and fictitious ghosts in quantum gravity
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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.
Originalsprog | Engelsk |
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Artikelnummer | 135911 |
Tidsskrift | Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics |
Vol/bind | 811 |
ISSN | 0370-2693 |
DOI | |
Status | Udgivet - 10 dec. 2020 |
Bibliografisk note
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© 2020 The Author(s)
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