18 citations · 70 across the 13 of their papers we have counts for
4 papers · 1 filter
Observational tests for oscillating expansion rate of the Universe
Koichi Hirano, Zen Komiya
We investigate the observational constraints on the oscillating scalar field model using data from type Ia supernovae, cosmic microwave background anisotropies, and baryon acoustic…
N-z Relation and CMB Anisotropies in the Universe with an Oscillating Scalar Field Having a Null Field State
Koichi Hirano, Kiyoshi Kawabata, Zen Komiya +1
We investigate whether or nor it is possible to find a scalar field model or models that are capable of explaining simultaneously the observed - relation given by the 2dF Gal…
Observational Constraints on Phantom Crossing DGP Gravity
Koichi Hirano, Zen Komiya
We study the observational constraints on the Phantom Crossing DGP model. We demonstrate that the crossing of the phantom divide does not occur within the framework of the original…
Phantom Crossing DGP Gravity
Koichi Hirano, Zen Komiya
We propose a phantom crossing Dvali--Gabadadze--Porrati (DGP) model. In our model, the effective equation of state of the DGP gravity crosses the phantom divide line. We demonstrat…