Accioly, A.2014-05-202014-05-202004-02-01Nuclear Physics B-proceedings Supplements. Amsterdam: Elsevier B.V., v. 127, p. 100-104, 2004.0920-5632http://hdl.handle.net/11449/23136Quadratic gravity in (2+1)D is nonunitarity at the tree level. When a topological Chern-Simons term is added to this theory, the harmless massive scalar mode of the former gives rise to a troublesome massive spin-0 ghost, while the massive spin-2 ghost is replaced by two massive physical particles both of spin-2. Therefore, unlike what it is claimed in the literature, quadratic Chern-Simons gravity in (2+1)D is nonunitary at the tree level.100-104engArtigo10.1016/j.nuclphysbps.2003.12.016WOS:000189279000016Acesso restrito