Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2009-02-20
Prog.Theor.Phys.121:1389-1397,2009
Physics
High Energy Physics
High Energy Physics - Theory
10 pages, references added
Scientific paper
10.1143/PTP.121.1389
We examine a unitarity of a particular higher-derivative extension of general relativity in three space-time dimensions, which has been recently shown to be equivalent to the Pauli-Fierz massive gravity at the linearized approximation level, and explore a possibility of generalizing the model to higher space-time dimensions. We find that the model in three dimensions is indeed unitary in the tree-level, but the corresponding model in higher dimensions is not so due to the appearance of non-unitary massless spin-2 modes.
Nakasone Masashi
Oda Ichiro
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