Details

Autor(en) / Beteiligte

• Percacci, R.
• Sezgin, E.

Titel

New class of ghost- and tachyon-free metric affine gravities

Ist Teil von

• Physical review. D, 2020-04, Vol.101 (8), Article 084040

Ort / Verlag

College Park: American Physical Society

Erscheinungsjahr

2020

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• We construct the spin-projection operators for a theory containing a symmetric two-index tensor and a general three-index tensor. We then use them to analyze, at linearized level, the most general action for a metric affine theory of gravity with terms up to second order in curvature, which depends on 28 parameters. In the metric case, we recover known results. In the torsion-free case, we are able to determine the most general six-parameter class of theories that are projective invariant, contain only one massless spin 2 and no spin 3, and are free of ghosts and tachyons.