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Constraints on the Primordial Magnetic Field from
Dai G. Yamazaki, Kiyotomo Ichiki, Toshitaka Kajino +1
A primordial magnetic field (PMF) can affect the evolution of density field fluctuations in the early universe.In this paper we constrain the PMF amplitude and power spectral…
Neutrino-Nucleus Reaction Cross Sections for Light Element Synthesis in Supernova Explosions
T. Yoshida, T. Suzuki, S. Chiba +5
The neutrino-nucleus reaction cross sections of 4He and 12C are evaluated using new shell model Hamiltonians. Branching ratios of various decay channels are calculated to evaluate…
Neutrino mass effects on vector and tensor CMB anisotropies in the presence of a primordial magnetic field
Kazuhiko Kojima, Kiyotomo Ichiki, Dai G. Yamazaki +2
If a primordial magnetic field (PMF) is present during photon decoupling and afterward, a finite neutrino mass can affect all modes of the CMB. In this work, we expand on earlier s…
New Constraints on Radiative Decay of Long-Lived Particles in Big Bang Nucleosynthesis with New He Photodisintegration Data
Motohiko Kusakabe, Toshitaka Kajino, Takashi Yoshida +3
A recent measurement of He photodisintegration reactions, He(,)H and He(,)He with laser-Compton photons shows smaller cross sections than those esti…
Effects of a Primordial Magnetic Field on Low and High Multipoles of the CMB
Dai G. Yamazaki, Kiyotomo Ichiki, Toshitaka Kajino +1
The existence of a primordial magnetic field (PMF) would affect both the temperature and polarization anisotropies of the cosmic microwave background (CMB). It also provides a plau…
A Simultaneous Solution to the ^6Li and ^7Li Big Bang Nucleosynthesis Problems from a Long-Lived Negatively-Charged Leptonic Particle
Motohiko Kusakabe, Toshitaka Kajino, Richard N. Boyd +2
The Li abundance observed in metal poor halo stars exhibits a plateau similar to that for Li suggesting a primordial origin. However, the observed abundance of Li is a…