Unitary Issues in Some Higher Derivative Field Theories
Departamento de Física Teórica, Universidad de Zaragoza, E-50009 Zaragoza, Spain
Instituto de Física, Universidade de Brasília, C. P. 04455, Brasília, DF 70910-900, Brazil
Departamento de Física–ICE, Universidade Federal de Juiz de Fora, Juiz de Fora, MG 36036-900, Brazil
Department of Theoretical Physics, Tomsk State Pedagogical University, Tomsk 634061, Russia
National Research Tomsk State University, Tomsk 634050, Russia
Author to whom correspondence should be addressed.
Received: 30 November 2017 / Revised: 22 January 2018 / Accepted: 2 February 2018 / Published: 14 February 2018
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.
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MDPI and ACS Style
Asorey, M.; Rachwal, L.; Shapiro, I. Unitary Issues in Some Higher Derivative Field Theories. Galaxies 2018, 6, 23.
Asorey M, Rachwal L, Shapiro I. Unitary Issues in Some Higher Derivative Field Theories. Galaxies. 2018; 6(1):23.
Asorey, Manuel; Rachwal, Leslaw; Shapiro, Ilya. 2018. "Unitary Issues in Some Higher Derivative Field Theories." Galaxies 6, no. 1: 23.
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