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Resonant Spin-Flavor Conversion of Supernova Neutrinos: Dependence on Electron Mole Fraction
T. Yoshida, A. Takamura, K. Kimura +3
Detailed dependence of resonant spin-flavor (RSF) conversion of supernova neutrinos on electron mole fraction Ye is investigated. Supernova explosion forms a hot-bubble and neutrin…
Generation of Curvature Perturbations with Extra Anisotropic Stress
Kazuhiko Kojima, Toshitaka Kajino, Grant J. Mathews
We study the evolution of curvature perturbations and the cosmic microwave background (CMB) power spectrum in the presence of an hypothesized extra anisotropic stress which might a…
Effect of Long-lived Strongly Interacting Relic Particles on Big Bang Nucleosynthesis
Motohiko Kusakabe, Toshitaka Kajino, Takashi Yoshida +1
It has been suggested that relic long-lived strongly interacting massive particles (SIMPs, or particles) existed in the early universe. We study effects of such long-lived unst…
138La-138Ce-136Ce nuclear cosmochronometer of supernova neutrino process
Takehito Hayakawa, Toshiyuki Shizuma, Toshitaka Kajino +2
The 138La (T1/2=102 Gyr) - 138Ce - 136Ce system is proposed to be used as a nuclear cosmochronometer for measuring the time elapsed from a supernova neutrino process. This chronome…
Empirical Abundance Scaling Laws and Implications for the Gamma-Process in Core-Collapse Supernovae
Takehito Hayakawa, Nobuyuki Iwamoto, Toshitaka Kajino +3
Analyzing the solar system abundances, we have found two empirical abundance scaling laws concerning the p- and s-nuclei with the same atomic number. The first scaling is s/p ratio…