18 citations · 70 across the 13 of their papers we have counts for
13 papers
Inflation with very small tensor-to-scalar ratio
Koichi Hirano
We have investigated inflation models that predict a very small value of the tensor-to-scalar ratio, . The spectral index , and the tensor-to-scalar ratio , are strictly…
Distinguishing between CDM and modified gravity with future observations of cosmic growth rate
Koichi Hirano
A probability of distinguishing between CDM model and modified gravity is studied by using the future observations for the growth rate of cosmic structure (Euclid redshift surve…
Neutrino masses from CMB B-mode polarization and cosmic growth rate
Koichi Hirano
Constraints on neutrino masses are estimated based on future observations of the cosmic microwave background (CMB), which includes the B-mode polarization produced by CMB lensing f…
Determination of neutrino masses from future observations of CMB B-mode polarization and the growth of structure
Koichi Hirano
Constraints on neutrino masses are estimated based on future observations of the cosmic microwave background (CMB) including the B-mode polarization produced by CMB lensing using t…
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…