Zobrazeno 1 - 10
of 85
pro vyhledávání: '"Hirano, Koichi"'
Autor:
Hirano, Koichi
We have investigated inflation models that predict a very small value of the tensor-to-scalar ratio, $r$. The spectral index $n_s$, and the tensor-to-scalar ratio $r$, are strictly constrained by the Planck data. $n_s$ and $r$ are sensitive to the sh
Externí odkaz:
http://arxiv.org/abs/1912.12515
Autor:
Hirano, Koichi
A probability of distinguishing between $\Lambda$CDM model and modified gravity is studied by using the future observations for the growth rate of cosmic structure (Euclid redshift survey). Adopting extended DGP model, Kinetic Gravity Braiding model,
Externí odkaz:
http://arxiv.org/abs/1512.09077
Autor:
Hirano, Koichi1 (AUTHOR) k_hirano@tsuru.ac.jp
Publikováno v:
Astrophysics & Space Science. May2023, Vol. 368 Issue 5, p1-4. 4p.
Akademický článek
Tento výsledek nelze pro nepřihlášené uživatele zobrazit.
K zobrazení výsledku je třeba se přihlásit.
K zobrazení výsledku je třeba se přihlásit.
Autor:
Hirano, Koichi
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 from the Planck satellite, and the growth rate of cosmic structure from
Externí odkaz:
http://arxiv.org/abs/1312.7814
Autor:
Hirano, Koichi
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 the Planck satellite, and baryon acoustic oscillations distance scale a
Externí odkaz:
http://arxiv.org/abs/1212.6423
Publikováno v:
Prog. Theor. Phys. 127 (2012), 1041-1056
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 cosmic microwave background (CMB), and baryon acoustic oscillations (B
Externí odkaz:
http://arxiv.org/abs/1103.6133
We have succeeded in establishing a cosmological model with a non-minimally coupled scalar field $\phi$ that can account not only for the spatial periodicity or the picket-fence structure exhibited by the galaxy $N$-$z$ relation of the 2dF survey, bu
Externí odkaz:
http://arxiv.org/abs/1102.0341
Autor:
Hirano, Koichi, Komiya, Zen
We compare observational data of growth rate with the prediction by Galileon theory. For the same value of the energy density parameter $\Omega_{m,0}$, the growth rate in Galileon models is enhanced compared with the $\Lambda$CDM case, due to the enh
Externí odkaz:
http://arxiv.org/abs/1012.5451