73 citations · 172 across the 9 of their papers we have counts for
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Construction and applications of the manifestly gauge invariant expressions of the solutions of the cosmological perturbation theory
Takashi Hamazaki
After giving how to construct the gauge invariant perturbation variable in an arbitrarily high order and in the arbitrary background spacetime, we consider the manifestly gauge inv…
Evolution of Cosmological Perturbations in the Universe dominated by Resonant Scalar Fields
Takashi Hamazaki
Recently a Hamiltonian formulation for the evolution of the universe dominated by multiple oscillatory scalar fields was developed by the present author and was applied to the inve…
Evolution of Cosmological Perturbations in the Universe dominated by Multiple Scalar Fields
Takashi Hamazaki
By efforts of several authors, it is recently established that the dynamical behavior of the cosmological perturbation on superhorizon scales is well approximated in terms of that…
Evolution of cosmological perturbations in a stage dominated by an oscillatory scalar field
Hideo Kodama, Takashi Hamazaki
In the investigation of the evolution of cosmological perturbations in inflationary universe models the behavior of perturbations during the reheating stage is the most unclear poi…
Evolution of Cosmological Perturbations during Reheating
Takashi Hamazaki, Hideo Kodama
The behavior of scalar perturbations on superhorizon scales during the reheating stage is investigated by replacing the rapidly oscillating inflaton field by a perfect fluid obtain…