Non-perturbative unitarity and fictitious ghosts in quantum gravity
High Energy Physics - Theory
2020-11-20 v2 General Relativity and Quantum Cosmology
Abstract
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.
Keywords
Cite
@article{arxiv.2009.06637,
title = {Non-perturbative unitarity and fictitious ghosts in quantum gravity},
author = {Alessia Platania and Christof Wetterich},
journal= {arXiv preprint arXiv:2009.06637},
year = {2020}
}
Comments
8 pages, 8 figures. V2: shortened version, matches the published one