166 citations · 399 across the 8 of their papers we have counts for
12 papers
Chasing the non-linear evolution of matter power spectrum with numerical resummation method: solution of closure equations
Takashi Hiramatsu, Atsushi Taruya
We present a new numerical scheme to treat the non-linear evolution of cosmological power spectra. Governing equations for matter power spectra have been previously derived by a no…
Non-linear Evolution of Matter Power Spectrum in Modified Theory of Gravity
Kazuya Koyama, Atsushi Taruya, Takashi Hiramatsu
We present a formalism to calculate the non-linear matter power spectrum in modified gravity models that explain the late-time acceleration of the Universe without dark energy. Any…
Four-dimensional CP U(1) lattice gauge theory for 3D antiferromagnets: Phase structure, gauge bosons and spin liquid
Kenji Sawamura, Takashi Hiramatsu, Katsuhiro Ozaki +2
In this paper we study the lattice CP model in (3+1) dimensions coupled with a dynamical compact U(1) gauge field. This model is an effective field theory of the $s={1 \over 2}…
A Closure Theory for Non-linear Evolution of Cosmological Power Spectra
Atsushi Taruya, Takashi Hiramatsu
We apply a non-linear statistical method in turbulence to the cosmological perturbation theory and derive a closed set of evolution equations for matter power spectra. The resultan…
Scalar perturbations in braneworld cosmology
Antonio Cardoso, Takashi Hiramatsu, Kazuya Koyama +1
We study the behaviour of scalar perturbations in the radiation-dominated era of Randall-Sundrum braneworld cosmology by numerically solving the coupled bulk and brane master wave…
Numerical study of curvature perturbations in a brane-world inflation at high-energies
Takashi Hiramatsu, Kazuya Koyama
We study the evolution of scalar curvature perturbations in a brane-world inflation model in a 5D Anti-de Sitter spacetime. The inflaton perturbations are confined to a 4D brane bu…