Publications (55)
Computational Method for the Retarded Potential in the Real-Time Simulation of Quantum Electrodynamics
Masahiro Fukuda, Kento Naito, Kazuhide Ichikawa +1
Limit on the Neutrino Mass from the WMAP Three Year Data
Masataka Fukugita, Kazuhide Ichikawa, Masahiro Kawasaki +1
Primordial Helium Abundance from CMB: a constraint from recent observations and a forecast
Kazuhide Ichikawa, Toyokazu Sekiguchi, Tomo Takahashi
Quantum computation of a quasiparticle band structure with the quantum-selected configuration interaction
Takahiro Ohgoe, Hokuto Iwakiri, Kazuhide Ichikawa +2
Robust and efficient calculation of activation energy by automated path search and density functional theory
Koki Ueno, Kazuhide Ichikawa, Kosei Sato +3
Implications of cosmic strings with time-varying tension on CMB and large scale structure
Kazuhide Ichikawa, Tomo Takahashi, Masahide Yamaguchi
Theoretical Study of Lithium Ionic Conductors by Electronic Stress Tensor Density and Electronic Kinetic Energy Density
Hiroo Nozaki, Yosuke Fujii, Kazuhide Ichikawa +3
Dark Energy Parametrizations and the Curvature of the Universe
Kazuhide Ichikawa, Tomo Takahashi
Cosmology and two-body problem of D-branes
Keitaro Takahashi, Kazuhide Ichikawa
Study of Simulation Method of Time Evolution in Rigged QED
Kazuhide Ichikawa, Masahiro Fukuda, Akitomo Tachibana
Dark Energy Evolution and the Curvature of the Universe from Recent Observations
Kazuhide Ichikawa, Tomo Takahashi
Constraints on neutrino masses from WMAP5 and BBN in the lepton asymmetric universe
Maresuke Shiraishi, Kazuhide Ichikawa, Kiyotomo Ichiki +2
Constraining Light Gravitino Mass from Cosmic Microwave Background
Kazuhide Ichikawa, Masahiro Kawasaki, Kazunori Nakayama +2
From Polyhedra to Crystals: A Graph-Theoretic Framework for Crystal Structure Generation
Tomoyasu Yokoyama, Kazuhide Ichikawa, Hisashi Naito
Demonstrating Quantum Computation for Quasiparticle Band Structures
Takahiro Ohgoe, Hokuto Iwakiri, Masaya Kohda +4
Stress Tensor of the Hydrogen Molecular Ion
Kazuhide Ichikawa, Akitomo Tachibana
A Theoretical Study on a Reaction of Iron(III) Hydroxide with Boron Trichloride by Ab Initio Calculation
Kazuhide Ichikawa, Toshiyuki Myoraku, Akinori Fukushima +4
CMB constraints on the fine structure constant
Kazuhide Ichikawa, Toru Kanzaki, Masahiro Kawasaki
Remarks on the Cosmic Density of Degenerate Neutrinos
Kazuhide Ichikawa, M. Kawasaki
Constraining Neutrino Masses by CMB Experiments Alone
Kazuhide Ichikawa, Masataka Fukugita, Masahiro Kawasaki
SpinMultiNet: Neural Network Potential Incorporating Spin Degrees of Freedom with Multi-Task Learning
Koki Ueno, Satoru Ohuchi, Kazuhide Ichikawa +2
Theoretical study of lithium clusters by electronic stress tensor
Kazuhide Ichikawa, Hiroo Nozaki, Naoya Komazawa +1
Big bang nucleosynthesis with a varying fine structure constant and non-standard expansion rate
Kazuhide Ichikawa, Masahiro Kawasaki
Measuring the History of Cosmic Reionization using the 21-cm PDF from Simulations
Kazuhide Ichikawa, Rennan Barkana, Ilian T. Iliev +2
Electronic stress tensor analysis of hydrogenated palladium clusters
Kazuhide Ichikawa, Ayumu Wagatsuma, Pawel Szarek +3
Probing the Effective Number of Neutrino Species with Cosmic Microwave Background
Kazuhide Ichikawa, Toyokazu Sekiguchi, Tomo Takahashi
Accelerating Optimal Elemental Configuration Search in Crystal using Ising Machine
Kazuhide Ichikawa, Satoru Ohuchi, Koki Ueno +1
Constraining the variation of the coupling constants with big bang nucleosynthesis
Kazuhide Ichikawa, M. Kawasaki
Non-Gaussianity, Spectral Index and Tensor Modes in Mixed Inflaton and Curvaton Models
Kazuhide Ichikawa, Teruaki Suyama, Tomo Takahashi +1
Cosmological Constraint on the Effective Number of Neutrino Species
Kazuhide Ichikawa
Electronic stress tensor of the hydrogen molecular ion: Comparison between the exact wave function and approximate wave functions using Gaussian basis sets
Kazuhide Ichikawa, Ayumu Wagatsuma, Masashi Kusumoto +1
Increasing the effective number of neutrinos with decaying particles
Kazuhide Ichikawa, Masahiro Kawasaki, Kazunori Nakayama +2
Solving the discrepancy among the light elements abundances and WMAP
Kazuhide Ichikawa, Masahiro Kawasaki, Fuminobu Takahashi
Solving the cosmic lithium problems with primordial late-decaying particles
Daniel Cumberbatch, Kazuhide Ichikawa, Masahiro Kawasaki +3
Designing Superionic Conductors Using Tetrahedrally Packed Structures
Tomoyasu Yokoyama, Kazuhide Ichikawa, Takuya Naruse +2
Theoretical Study of Hydrogenated Tetrahedral Aluminum Clusters
Kazuhide Ichikawa, Yuji Ikeda, Ayumu Wagatsuma +3
Implication of Dark Energy Parametrizations on the Determination of the Curvature of the Universe
Kazuhide Ichikawa, Masahiro Kawasaki, Toyokazu Sekiguchi +1
Microwave Emission from the Edgeworth-Kuiper Belt and the Asteroid Belt Constrained from WMAP
Kazuhide Ichikawa, Masataka Fukugita
Comments on the Evolution of Strongly Degenerate Neutrinos in the Early Universe
Kazuhide Ichikawa, Masahiro Kawasaki
The oscillation effects on thermalization of the neutrinos in the universe with low reheating temperature
Kazuhide Ichikawa, Masahiro Kawasaki, Fuminobu Takahashi
Electronic stress tensor analysis of molecules in gas phase of CVD process for GeSbTe alloy
Hiroo Nozaki, Yuji Ikeda, Kazuhide Ichikawa +1
Constraining the time variation of the coupling constants from cosmic microwave background: effect of Î_{QCD}
Masahiro Nakashima, Kazuhide Ichikawa, Ryo Nagata +1
On the Determination of Neutrino Masses and Dark Energy Evolution from the Cross Correlation of CMB and LSS
Kazuhide Ichikawa, Tomo Takahashi
Neutrino mass constraint from CMB and its degeneracy with other cosmological parameters
Kazuhide Ichikawa
Crystal Structure Generation Based on Polyhedra using Dual Periodic Graphs
Tomoyasu Yokoyama, Kazuhide Ichikawa, Hisashi Naito
Revisiting the Constraint on the Helium Abundance from CMB
Kazuhide Ichikawa, Tomo Takahashi
Optimal elemental configuration search in crystal using quantum approximate optimization algorithm
Kazuhide Ichikawa, Genta Hayashi, Satoru Ohuchi +3
The Hubble constant and dark energy from cosmological distance measures
Kazuhide Ichikawa, Tomo Takahashi
Theoretical study of atoms by the electronic kinetic energy density and stress tensor density
Hiroo Nozaki, Kazuhide Ichikawa, Akitomo Tachibana
Constraint on the Effective Number of Neutrino Species from the WMAP and SDSS LRG Power Spectra
Kazuhide Ichikawa, Masahiro Kawasaki, Fuminobu Takahashi
Deep variational quantum eigensolver for excited states and its application to quantum chemistry calculation of periodic materials
Kaoru Mizuta, Mikiya Fujii, Shigeki Fujii +4
Inverted-sandwich-type and open-lantern-type dinuclear transition metal complexes: theoretical study of chemical bonds by electronic stress tensor
Kazuhide Ichikawa, Ayumu Wagatsuma, Yusaku I. Kurokawa +2
Neutrino mass from cosmology: Impact of high-accuracy measurement of the Hubble constant
Toyokazu Sekiguchi, Kazuhide Ichikawa, Tomo Takahashi +1
Study of Simulation Method of Time Evolution of Atomic and Molecular Systems by Quantum Electrodynamics
Kazuhide Ichikawa, Masahiro Fukuda, Akitomo Tachibana
Primordial Curvature Fluctuation and Its Non-Gaussianity in Models with Modulated Reheating
Kazuhide Ichikawa, Teruaki Suyama, Tomo Takahashi +1