2009/05/31 by Carlos A. Hernaski, C. A Hernaski, A. A. Vargas-Paredes +2 · 3 citations
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Particle physics theoretical and experimental studies #hep-th
paper · pdf · doi:10.1103/physrevd.80.124012
published as Phys.Rev.D80:124012,2009 · 11 pages
openalex publication_date 2009/12/09 · arxiv created 2010/04/17 · arxiv updated 2010/04/21 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
In this paper, we reassess a particular R2-type gravity action in D dimensions, recently studied by Nakasone and Oda, now taking torsion effects into account. Considering that the vielbein and the spin connection carry independent propagating degrees of freedom, we conclude that ghosts and tachyons are absent only if torsion is nonpropagating, and we also conclude that there is no room for massive gravitons. To include these excitations, we understand how to enlarge Nakasone-Oda's model by means of explicit torsion terms in the action and we discuss the unitarity of the enlarged model for arbitrary dimensions.