Self-accelerating Universe in modified gravity with dynamical torsion
High Energy Physics - Theory
2017-10-19 v2 General Relativity and Quantum Cosmology
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 non-Riemannian connection. Small value of the effective cosmological constant is obtained at the expense of the hierarchy between the dimensionless couplings.
Cite
@article{arxiv.1606.02565,
title = {Self-accelerating Universe in modified gravity with dynamical torsion},
author = {V. Nikiforova and S. Randjbar-Daemi and V. Rubakov},
journal= {arXiv preprint arXiv:1606.02565},
year = {2017}
}