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Resumen: We analyze the unitarity properties of higher derivative quantum field theories which are free of ghosts and ultraviolet singularities. We point out that in spite of the absence of ghosts most of these theories are not unitary. This result confirms the difficulties of finding a consistent quantum field theory of quantum gravity.
Idioma: Inglés
DOI: 10.3390/galaxies6010023
Año: 2018
Publicado en: Galaxies 6, 1 (2018), 23 [7 pp]
ISSN: 2075-4434
Factor impacto SCIMAGO: 0.591 - Astronomy and Astrophysics (Q3)

Financiación: info:eu-repo/grantAgreement/EUR/COST/MP1405-QSPACE
Financiación: info:eu-repo/grantAgreement/ES/DGA/E24-2
Financiación: info:eu-repo/grantAgreement/ES/MINECO/FPA2015-65745-P
Tipo y forma: Article (Published version)
Área (Departamento): Área Física Teórica (Dpto. Física Teórica)

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