22 citations · 47 across the 3 of their papers we have counts for
3 papers
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…
Evolution of Cosmological Perturbations in the Presence of Primordial Magnetic Fields
Kazuhiko Kojima, Kiyotomo Ichiki
Possible existence of the primordial magnetic fields has affected the structure formation of the universe. In this paper it is shown that the initial conditions for density perturb…
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…