Unitary Issues in Some Higher Derivative Field Theories
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 fi...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2018-02-01
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| Series: | Galaxies |
| Subjects: | |
| Online Access: | http://www.mdpi.com/2075-4434/6/1/23 |