New types of gravity
arXiv:1007.3571 · doi:10.1140/epjc/s10052-011-1797-9
Abstract
Recently theories based on modifications of teleparallel gravity where torsion is the geometric object describing gravity instead of curvature have been proposed to explain the present cosmic accelerating expansion. The field equations are always second order, remarkably simpler than theories. In analogy to the theory, we consider here three types of gravity, and find that all of them can give rise to cosmic acceleration with interesting features, respectively.
6 pages, 9 figures, some changes are made
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