15 citations · 43 across the 7 of their papers we have counts for
7 papers
Constraining Galileon gravity from observational data with growth rate
Koichi Hirano, Zen Komiya, Hisato Shirai
We studied the cosmological constraints on the Galileon gravity obtained from observational data of the growth rate of matter density perturbations, the supernovae Ia (SN Ia), the…
Galaxy N-z Relation and CMB Spectrum Based on Cosmological Model with Scalar Field Having Modified Potential Form
Koichi Hirano, Kiyoshi Kawabata, Zen Komiya +1
We have succeeded in establishing a cosmological model with a non-minimally coupled scalar field that can account not only for the spatial periodicity or the picket-fence struc…
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…