31 citations · 83 across the 3 of their papers we have counts for
3 papers
Constraining the time variation of the coupling constants from cosmic microwave background: effect of Λ_{QCD}
Masahiro Nakashima, Kazuhide Ichikawa, Ryo Nagata +1
We investigate constraints on the time variation of the fine structure constant between the recombination epoch and the present epoch, Δα/α\equiv (α_{rec} - α_{now})/α_{now}, from…
Measuring the History of Cosmic Reionization using the 21-cm PDF from Simulations
Kazuhide Ichikawa, Rennan Barkana, Ilian T. Iliev +2
The 21-cm PDF (i.e., distribution of pixel brightness temperatures) is expected to be highly non-Gaussian during reionization and to provide important information on the distributi…
Constraints on neutrino masses from WMAP5 and BBN in the lepton asymmetric universe
Maresuke Shiraishi, Kazuhide Ichikawa, Kiyotomo Ichiki +2
In this paper, we put constraints on neutrino properties such as mass and degeneracy parameters from WMAP5 data and light element abundances by using a Markov chain Mon…