185 citations · 1k across the 37 of their papers we have counts for
5 papers · 1 filter
Conformal transformation in theories
Rong-Jia Yang
It is well-known that theories are dynamically equivalent to a particular class of scalar-tensor theories. In analogy to the extension of the Einstein-Hilbert action…
New types of gravity
Rong-Jia Yang
Recently theories based on modifications of teleparallel gravity where torsion is the geometric object describing gravity instead of curvature have been proposed to explain…
Phase-space analysis of a class of k-essence cosmology
Rong-Jia Yang, Xiang-Ting Gao
We perform a detailed phase-space analysis of a class of k-essence cosmology. We find the critical points can be divided into three classes: points unstable but the model stable, b…
Restrictions on purely kinetic k-essence
Rong-Jia Yang, Xiang-Ting Gao
We restrict purely kinetic k-essence. Assuming the equation of state is a power law of the kinetic energy: , to obtain accelerated phases, we must have as one of ne…
Geometrical diagnostic for purely kinetic k-essence dark energy
Xiang-Ting Gao, Rong-Jia Yang
Geometrical diagnostic, involving the statefinder and , is widely used to discriminate different dark energy models. We apply the statefinder and …