High Energy Physics - Theory
[Submitted on 3 Feb 2018
]
Title: Unitarity issues in higher derivative field theories
Title: 高阶导数场论中的幺正性问题
Abstract: 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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