60 citations · 206 across the 8 of their papers we have counts for
8 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…
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…
Energy Extraction from a Rotating Black Hole by Magnetic Reconnection in Ergosphere
Shinji Koide, Kenzo Arai
We investigate mechanisms of energy extraction from a rotating black hole in terms of negative energy-at-infinity. In addition to the Penrose process through particle fission, the…
Lithium production on a low-mass secondary in a black hole soft X-ray transient
Shin-ichiro Fujimoto, Ryuichi Matsuba, Kenzo Arai
We examine production of Li on the surface of a low-mass secondary in a black hole soft X-ray transient (BHSXT) through the spallation of CNO nuclei by neutrons which are ejected f…
Big-bang nucleosynthesis in Brans-Dicke cosmology with a varying term related to WMAP
R. Nakamura, M. Hashimoto, S. Gamow +1
We investigate the big-bang nucleosynthesis in a Brans-Dicke model with a varying term using the Monte-Carlo method and likelihood analysis. It is found that the cosmic expansi…