Non-perturbative unitarity and fictitious ghosts in quantum gravity

• Verfasst von: Platania, Alessia Benedetta [VerfasserIn]
• Verfasst von: Wetterich, Christof [VerfasserIn]
• Titel: Non-perturbative unitarity and fictitious ghosts in quantum gravity
• Verf.angabe: Alessia Platania, Christof Wetterich
• E-Jahr: 2020
• Jahr: 12 November 2020
• Umfang: 7 S.
• Fussnoten: Gesehen am 28.01.2021
• Titel Quelle: Enthalten in: Physics letters / B
• Ort Quelle: Amsterdam : North-Holland Publ., 1967
• Jahr Quelle: 2020
• Band/Heft Quelle: 811(2020) Artikel-Nummer 135911, 7 Seiten
• ISSN Quelle: 1873-2445
• DOI: doi:10.1016/j.physletb.2020.135911
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1745884599

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.