Self-accelerating universe in modified gravity with dynamical torsion

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...

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Bibliographic Details
Published in:Physical review. D 2017-01, Vol.95 (2), Article 024013
Main Authors: Nikiforova, V., Randjbar-Daemi, S., Rubakov, V.
Format: Article
Language:English
Subjects:
Cosmological constant
Couplings
Ghosts
Torsion
Universe
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Summary: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.
ISSN:2470-0010
2470-0029
DOI:10.1103/PhysRevD.95.024013