Abstract
We consider a model belonging to the class of gravities with dynamical torsion. The model is free of ghosts and gradient instabilities about Minkowski and torsionless Einstein backgrounds. We find that at zero cosmological constant, the model admits a self-accelerating solution with a non-Riemannian connection. Small value of the effective cosmological constant is obtained at the expense of the hierarchy between the dimensionless couplings.
- Received 1 September 2016
DOI:https://doi.org/10.1103/PhysRevD.95.024013
© 2017 American Physical Society
Physics Subject Headings (PhySH)
Gravitation, Cosmology & Astrophysics