Accioly, Antonio [UNESP]2022-04-282022-04-282003-01-01Physical Review D - Particles, Fields, Gravitation and Cosmology, v. 67, n. 12, 2003.1550-23681550-7998http://hdl.handle.net/11449/224358The addition of a topological Chern-Simons term to three-dimensional higher-derivative gravity is not a good therapy to cure the nonunitarity of the aforementioned theory. Moreover, [Formula Presented] gravity in (2+1)D, which is unitary at the tree level, becomes tree-level nonunitary when it is augmented by the abovementioned topological term. Therefore, unlike what is claimed in the literature, topological higher-derivative gravity in (2+1)D is not tree-level unitary and neither is topological three-dimensional [Formula Presented] gravity. © 2003 The American Physical Society.engArtigo10.1103/PhysRevD.67.1275022-s2.0-0043129003