Publications (91)
Generation of magnetic fields in Einstein-Aether gravity
Shohei Saga, Maresuke Shiraishi, Kiyotomo Ichiki +1
Constraints on the Primordial Magnetic Field from $Ï_8$
Dai G. Yamazaki, Kiyotomo Ichiki, Toshitaka Kajino +1
Probing small-scale cosmological fluctuations with the 21 cm forest: effects of neutrino mass, running spectral index and warm dark matter
Hayato Shimabukuro, Kiyotomo Ichiki, Susumu Inoue +1
Test for anisotropy in the mean of the CMB temperature fluctuation in spherical harmonic space
Daichi Kashino, Kiyotomo Ichiki, Tsutomu T. Takeuchi
Biermann Mechanism in Primordial Supernova Remnant and Seed Fields
Hidekazu Hanayama, Keitaro Takahashi, Kei Kotake +3
Copula Cosmology: Constructing a Likelihood Function
Masanori Sato, Kiyotomo Ichiki, Tsutomu T. Takeuchi
Analytic formulae of the CMB bispectra generated from non-Gaussianity in the tensor and vector perturbations
Maresuke Shiraishi, Shuichiro Yokoyama, Daisuke Nitta +2
Lepton asymmetry in the primordial gravitational wave spectrum
Kiyotomo Ichiki, Masahide Yamaguchi, Jun'Ichi Yokoyama
Cosmic Discordance: Detection of a modulation in the primordial fluctuation spectrum
Kiyotomo Ichiki, Ryo Nagata, Jun'ichi Yokoyama
Constraining primordial vector mode from B-mode polarization
Shohei Saga, Maresuke Shiraishi, Kiyotomo Ichiki
CO Component Estimation Based on the Independent Component Analysis
Kiyotomo Ichiki, Ryohei Kaji, Hiroaki Yamamoto +2
Primordial Neutrinos, Cosmological Perturbations in Interacting Dark-Energy Model: CMB and LSS
Kiyotomo Ichiki, Yong-Yeon Keum
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
Primordial magnetic fields from the string network
Kouichirou Horiguchi, Kiyotomo Ichiki, Naoshi Sugiyama
Electromagnetic Properties of the Early Universe
Keitaro Takahashi, Kiyotomo Ichiki, Naoshi Sugiyama
Evolution of Cosmological Perturbations in the Presence of Primordial Magnetic Fields
Kazuhiko Kojima, Kiyotomo Ichiki
Gravitational Wave Spectrum Induced by Primordial Scalar Perturbations
Daniel Baumann, Kiyotomo Ichiki, Paul J. Steinhardt +1
Primordial magnetic fields generated by the non-adiabatic fluctuations at pre-recombination era
Satoshi Maeda, Keitaro Takahashi, Kiyotomo Ichiki
Probing polarization states of primordial gravitational waves with CMB anisotropies
Shun Saito, Kiyotomo Ichiki, Atsushi Taruya
Studying 21cm power spectrum with one-point statistics
Hayato Shimabukuro, Shintaro Yoshiura, Keitaro Takahashi +2
Neutrino Mass Bounds from Neutrinoless Double Beta Decays and Large Scale Structures
Yong-Yeon Keum, Kiyotomo Ichiki, Taka Kajino
An Analytic Model of Superclusters
Masamune Oguri, Keitaro Takahashi, Kiyotomo Ichiki +1
Constraining the Contribution of Galaxies and Active Galactic Nuclei to Cosmic Reionization
Shintaro Yoshiura, Kenji Hasegawa, Kiyotomo Ichiki +3
Weak lensing induced by second-order vector mode
Shohei Saga, Daisuke Yamauchi, Kiyotomo Ichiki
Constraints on the neutrino mass and the primordial magnetic field from the matter density fluctuation parameter $Ï_8$
Dai G. Yamazaki, Kiyotomo Ichiki, Toshitaka Kajino +1
Cosmic microwave background bispectrum of tensor passive modes induced from primordial magnetic fields
Maresuke Shiraishi, Daisuke Nitta, Shuichiro Yokoyama +2
Stochastic Gravitational Wave Background in Brane World Cosmology
Kiyotomo Ichiki, Kouji Nakamura
Lower Bounds on Magnetic Fields in Intergalactic Voids from Long-Term GeV-TeV Light Curves of the Blazar Mrk 421
Keitaro Takahashi, Masaki Mori, Kiyotomo Ichiki +2
Constraints on Neutrino Masses from Weak Lensing
Kiyotomo Ichiki, Masahiro Takada, Tomo Takahashi
Constraining the EoR model parameters with the 21cm bispectrum
Hayato Shimabukuro, Shintaro Yoshiura, Keitaro Takahashi +2
21cm-line bispectrum as method to probe Cosmic Dawn and Epoch of Reionization
Hayato Shimabukuro, Shintaro Yoshiura, Keitaro Takahashi +2
CMB probes on the correlated axion isocurvature perturbation
Kenji Kadota, Jinn-Ouk Gong, Kiyotomo Ichiki +1
Relationship between the CMB, SZ Cluster Counts, and Local Hubble Parameter Measurements in a Simple Void Model
Kiyotomo Ichiki, Chul-Moon Yoo, Masamune Oguri
New Constraints on the Primordial Magnetic Field
Dai G. Yamazaki, Kiyotomo Ichiki, Toshitaka Kajino +1
Magnetic Field Spectrum at Cosmological Recombination
Kiyotomo Ichiki, Keitaro Takahashi, Naoshi Sugiyama +2
Reconstruction of CMB Temperature Anisotropies with Primordial CMB Induced Polarization in Galaxy Clusters
Guo-Chin Liu, Kiyotomo Ichiki, Hiroyuki Tashiro +1
Formulation and constraints on decaying dark matter with finite mass daughter particles
Shohei Aoyama, Kiyotomo Ichiki, Daisuke Nitta +1
Effect of Primordial Magnetic Field on Seeds for Large Scale Structure
Dai G. Yamazaki, Kiyotomo Ichiki, Ken-ichi Umezu +1
Cosmological constraints on scalar-tensor gravity and the variation of the gravitational constant
Junpei Ooba, Kiyotomo Ichiki, Takeshi Chiba +1
Ghost Dark Matter
Tomonori Furukawa, Shuichiro Yokoyama, Kiyotomo Ichiki +2
Cosmic Shear from Scalar-Induced Gravitational Waves
Devdeep Sarkar, Paolo Serra, Asantha Cooray +2
Precise Estimation of Cosmological Parameters Using a More Accurate Likelihood Function
Masanori Sato, Kiyotomo Ichiki, Tsutomu T. Takeuchi
Detectability of Pair Echos from Gamma-Ray Bursts and Intergalactic Magnetic Fields
Keitaro Takahashi, Kohta Murase, Kiyotomo Ichiki +2
The influence of primordial magnetic fields on the spherical collapse model in cosmology
Yuki Shibusawa, Kiyotomo Ichiki, Kenji Kadota
A Test for the Zero Mean Hypothesis in Cosmology
Kiyotomo Ichiki
Weak lensing from self-ordering scalar fields
Shohei Saga, Kouichirou Horiguchi, Kiyotomo Ichiki
Cosmology from the EoR/Cosmic Dawn with the SKA
Jonathan Pritchard, Kiyotomo Ichiki, Andrei Mesinger +8
Application of cross correlations between CMB and large scale structure to constraints on the primordial non-Gaussianity
Yoshitaka Takeuchi, Kiyotomo Ichiki, Takahiko Matsubara
Effects of a primordial magnetic field with log-normal distribution on the cosmic microwave background
Dai G. Yamazaki, Kiyotomo Ichiki, Keitaro Takahashi
Probing Quintessence Potential with Future Cosmological Surveys
Yoshitaka Takeuchi, Kiyotomo Ichiki, Tomo Takahashi +1
Cosmic microwave background bispectrum of vector modes induced from primordial magnetic fields
Maresuke Shiraishi, Daisuke Nitta, Shuichiro Yokoyama +2
Causal Structure and Gravitational Waves in Brane World Cosmology
Kiyotomo Ichiki, Kouji Nakamura
Evidence for Planck-scale resonant particle production during inflation from the CMB power spectrum
Grant J. Mathews, Mayukh R. Gangopadhyay, Kiyotomo Ichiki +1
Exploring the origin of the fine structures in the CMB temperature angular power spectrum
Kohei Kumazaki, Kiyotomo Ichiki, Naoshi Sugiyama +1
Cosmological Signatures of the Interaction between Dark-Energy and Massive Neutrinos
Kiyotomo Ichiki, Yong-Yeon Keum
Magnetic field spectrum at cosmological recombination revisited
Shohei Saga, Kiyotomo Ichiki, Keitaro Takahashi +1
Constraints on the multi-lognormal magnetic fields from the observations of the cosmic microwave background and the matter power spectrum
Dai G. Yamazaki, Kiyotomo Ichiki, Keitaro Takahashi
Neutrino Masses from Cosmological Probes in Interacting Neutrino Dark-Energy Models
Kiyotomo Ichiki, Yong-Yeon Keum
Effect of supersonic relative motion between baryons and dark matter on collapsed objects
Shinsuke Asaba, Kiyotomo Ichiki, Hiroyuki Tashiro
Probing Early Cosmic Magnetic Fields through Pair Echos from High-Redshift GRBs
Keitaro Takahashi, Susumu Inoue, Kiyotomo Ichiki +1
21cm fluctuations from primordial magnetic fields
Maresuke Shiraishi, Hiroyuki Tashiro, Kiyotomo Ichiki
WMAP Constraints on Decaying Cold Dark Matter
Kiyotomo Ichiki, Masamune Oguri, Keitaro Takahashi
Planck constraints on scalar-tensor cosmology and the variation of the gravitational constant
Junpei Ooba, Kiyotomo Ichiki, Takeshi Chiba +1
Constraints on primordial non-Gaussianity from Galaxy-CMB lensing cross-correlation
Yoshitaka Takeuchi, Kiyotomo Ichiki, Takahiko Matsubara
Cosmic microwave background constraints on a decaying cosmological term related to the thermal evolution
Riou Nakamura, Masa-aki Hashimoto, Kiyotomo Ichiki
Primordial Magnetic Field Effects on the CMB and Large Scale Structure
Dai G. Yamazaki, Kiyotomo Ichiki, Toshitaka Kajino +1
Computation approach for CMB bispectrum from primordial magnetic fields
Maresuke Shiraishi, Daisuke Nitta, Shuichiro Yokoyama +2
Constraints on Generalized Dark Energy from Recent Observations
Kiyotomo Ichiki, Tomo Takahashi
Probing the Nature of the Weakest Intergalactic Magnetic Fields with the High Energy Emission of Gamma-Ray Bursts
Kiyotomo Ichiki, Susumu Inoue, Keitaro Takahashi
Scale-dependent bias due to primordial vector fields
Maresuke Shiraishi, Shuichiro Yokoyama, Kiyotomo Ichiki +1
Evolution of perturbations and cosmological constraints in decaying dark matter models with arbitrary decay mass products
Shohei Aoyama, Toyokazu Sekiguchi, Kiyotomo Ichiki +1
Sunyaev-Zel'dovich power spectrum with decaying cold dark matter
Keitaro Takahashi, Masamune Oguri, Kiyotomo Ichiki
Observational constraints on a decaying cosmological term
Riou Nakamura, Masa-aki Hashimoto, Kiyotomo Ichiki
Generation of magnetic field from cosmological perturbations
Keitaro Takahashi, Kiyotomo Ichiki, Hiroshi Ohno +2
Constraint on the primordial vector mode and its magnetic field generation from seven-year Wilkinson Microwave Anisotropy Probe Observations
Kiyotomo Ichiki, Keitaro Takahashi, Naoshi Sugiyama
Primordial magnetic field constrained from CMB anisotropies,and its generation and evolution before, during and after the BBN
Dai G. Yamazaki, Kiyotomo Ichiki, Toshitaka Kajino +1
Cosmological Magnetic Field: a fossil of density perturbations in the early universe
Kiyotomo Ichiki, Keitaro Takahashi, Hiroshi Ohno +2
The impact of massive neutrinos on the abundance of massive clusters
Kiyotomo Ichiki, Masahiro Takada
Effects of a Primordial Magnetic Field on Low and High Multipoles of the CMB
Dai G. Yamazaki, Kiyotomo Ichiki, Toshitaka Kajino +1
CMB Bispectrum from Primordial Scalar, Vector and Tensor non-Gaussianities
Maresuke Shiraishi, Daisuke Nitta, Shuichiro Yokoyama +2
Magnetic field generation from cosmological perturbations
Keitaro Takahashi, Kiyotomo Ichiki, Hiroshi Ohno +1
The Search for a Primordial Magnetic Field
Dai G. Yamazaki, Toshitaka Kajino, Grant J. Mathew +1
Upper limit on the amplitude of gravitational waves around 0.1Hz from the Global Positioning System
Shohei Aoyama, Rina Tazai, Kiyotomo Ichiki
Impact of anisotropic stress of free-streaming particles on gravitational waves induced by cosmological density perturbations
Shohei Saga, Kiyotomo Ichiki, Naoshi Sugiyama
Lower Bounds on Intergalactic Magnetic Fields from Simultaneously Observed GeV-TeV Light Curves of the Blazar Mrk 501
Keitaro Takahashi, Masaki Mori, Kiyotomo Ichiki +1
Cosmology with the Square Kilometre Array by SKA-Japan
Daisuke Yamauchi, Kiyotomo Ichiki, Kazunori Kohri +8
Biermann Mechanism in Primordial Supernova Remnant and Seed Magnetic Fields
Hidekazu Hanayama, Keitaro Takahashi, Kei Kotake +3
Revisiting the oscillations in the CMB angular power spectra at $\ell\sim120$ in the Planck2015 data
Koichiro Horiguchi, Kiyotomo Ichiki, Jun'ichi Yokoyama
Primordial magnetic fields from self-ordering scalar fields
Kouichirou Horiguchi, Kiyotomo Ichiki, Toyokazu Sekiguchi +1
Optimal limits on primordial magnetic fields from CMB temperature bispectrum of passive modes
Maresuke Shiraishi, Daisuke Nitta, Shuichiro Yokoyama +1
Constraints on neutrino masses from WMAP5 and BBN in the lepton asymmetric universe
Maresuke Shiraishi, Kazuhide Ichikawa, Kiyotomo Ichiki +2