Abstract
Spacetime curvature plays the primary role in general relativity but Einstein later considered a theory where torsion was the central quantity. Just as the Einstein-Hilbert action in the Ricci curvature scalar can be generalized to gravity, we consider extensions of teleparallel, or torsion scalar , gravity to theories. The field equations are naturally second order, avoiding pathologies, and can give rise to cosmic acceleration with unique features.
- Received 25 May 2010
DOI:https://doi.org/10.1103/PhysRevD.81.127301
©2010 American Physical Society