38 citations · 100 across the 10 of their papers we have counts for
10 papers
Big-Bang nucleosynthyesis: constraints on nuclear reaction rates, neutrino degeneracy, inhomogeneous and Brans-Dicke models
Riou Nakamura, Masa-aki Hasahimoto, Ryotaro Ichimasa +1
We review the recent progress in the Big-Bang nucleosynthesis which includes the standard and non-standard theory of cosmology, effects of neutrino degeneracy, and inhomogeneous nu…
Big-Bang Nucleosynthesis in comparison with observed helium and deuterium abundances - possibility of a non-standard model
R. Ichimasa, R. Nakamura, M. Hashimoto +1
Comparing the latest observed abundances of 4He and D, we make a ?2 analysis to see whether it is possible to reconcile primordial nucleosynthesis using up-to-date nuclear data of…
Constraint on Heavy Element Production in Inhomogeneous Big-Bang Nucleosynthesis from The Light-Element Observations
Riou Nakamura, Masa-aki Mashimoto, Shin-ichiro Fujimoto +1
We investigate the observational constraints on the inhomogeneous big-bang nucleosynthesis that Matsuura et al. suggested the possibility of the heavy element production beyond ${}…
Constraints on a vacuum energy from both SNIa and CMB temperature observations
Riou Nakamura, E. P. Berni Ann Thushari, Mikio Ikeda +1
We investigate the cosmic thermal evolution with a vacuum energy which decays into photon at the low-redshift. We assume that the vacuum energy is a function of the scale factor th…
Brans-Dicke model constrained from Big Bang nucleosynthesis and magnitude redshift relations of Supernovae
E. P. B. A. Thushari, R. Nakamura, M. Hashimoto +1
The Brans-Dicke model with a variable cosmological term () has been investigated with use of the coupling constant of . Parameters inherent in this model are constrain…
Observational Constraint on Heavy Element Production in Inhomogeneous Big Bang Nucleosynthesis
Riou Nakamura, Masa-aki Hashimoto, Shin-ichiro Fujimoto +2
Based on a scenario of the inhomogeneous big-bang nucleosynthesis (IBBN), we investigate the detailed nucleosynthesis that includes the production of heavy elements beyond Li-7. Fr…