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f(R) Gravity and its Cosmological Implications
Hayato Motohashi, Alexei A. Starobinsky, Jun'ichi Yokoyama
We have investigated the evolution of a homogeneous isotropic background of the Universe and inhomogeneous subhorizon matter density perturbations in viable models of presen…
Auxiliary fields representation for modified gravity models
Davi C. Rodrigues, Filipe de O. Salles, Ilya L. Shapiro +1
We consider tensor-multiscalar representations for several types of modified gravity actions. The first example is the theory with the action representing an arbitrary smooth funct…
Future Oscillations around Phantom Divide in f(R) Gravity
Hayato Motohashi, Alexei A. Starobinsky, Jun'ichi Yokoyama
It is known that scalar-tensor theory of gravity admits regular crossing of the phantom divide line $w_{\DE}=-1$ for dark energy, and existing viable models of present dark energy…