Updated on 2024/07/28

Information

 

写真a

 
YAMAMOTO KAZUHIRO
 
Organization
Faculty of Science Department of Physics Professor
Research Center for Advanced Particle Physics (Joint Appointment)
School of Sciences Department of Physics(Joint Appointment)
Graduate School of Sciences Department of Physics(Joint Appointment)
Title
Professor
Contact information
メールアドレス
Profile
I provide education for undergraduate and graduate students focusing on physics majors, electromagnetism II, quantum mechanics I, general relativity, and cosmology. I am working on the research and education on gravity and cosmology that applies quantum science, and educational support for doctoral students as an executive committee member of the leading human resource development fellowship (quantum science area).

Degree

  • Ph.D Hiroshima University

Research History

  • 平成7年12月ー平成31年3月 広島大学

Research Interests・Research Keywords

  • Research theme:Theoretical studies on testing quantum nature of gravity

    Keyword:quantum gravity, quantum mechanics, quantum entanglement, Unruh effect

    Research period: 2019.4 - 2022.3

  • Research theme:Origin of accelerating Universe

    Keyword:Cosmology, Observational cosmology, Inflationary universe, large scale structure of the Universe, tests of gravitational theory and dark energy, quantum field theory on curved spacetime, quantum information and gravity・cosmology

    Research period: 2019.4 - 2022.3

Awards

  • 日本物理学会第2回論文賞(1997年)

    2017.3   日本物理学会   標 題: Quantum State During and After Nucleation of an O(4)-Symmetric Bubble 著 者: 佐々木節,田中貴浩,山本一博,横山順一 掲載誌: Prog. Theor. Phys. 90 (1993) 1019-1038 受賞理由: ビッグバン宇宙の起源や宇宙構造の起源を,急激な初期膨張とそれに続く潜熱の解放によって説明するインフレーション理論は,この分野のパラダイムとなっている.しかし,現在インフレーションのモデルとしては有力なモデルがあるものの,具体的なインフレーションの機構については,研究者の一致したモデルがあるわけではなく,いろいろな観点から研究が進められている段階にある.この論文は,宇宙初期における真空の1次相転移において生成される“泡”内の量子状態を明らかにした最初の基礎的論文である.  現在,このように生成された一つの“泡”の中でインフレーションをおこし,観測的に知られている宇宙はこの泡内にあるとするモデルが世界のいくつかのグループで精力的に研究されているが,この論文はその先駆けとなった論文の一つである.著者のグループはこの論文発表後数編の論文を発表し,単にスカラー場のゆらぎのみならず,重力波モード等に拡張し,さらに宇宙背景放射に対する揺らぎの観測との比較まで調べるなど,このモデルを発展させている.これらの研究は初期宇宙の研究分野で高く評価されているが,この論文は著者らの理論展開の最初の論文と言えるもので,論文賞として十分価値のあるものと言える.

Papers

  • Leggett-Garg inequalities for testing quantumness of gravity Reviewed

    Akira Matsumura, Yasusada Nambu, Kazuhiro Yamamoto

    Physical Review A   106 ( 1 )   2022.7

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    DOI: 10.1103/physreva.106.012214

  • Entanglement and decoherence of massive particles due to gravity Invited Reviewed International journal

    Daisuke Miki, Akira Matsumura, Kazuhiro Yamamoto

    PHYSICAL REVIEW D   103 ( 2 )   2021.1

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    DOI: 10.1103/PhysRevD.103.026017

    Other Link: https://journals.aps.org/prd/abstract/10.1103/PhysRevD.103.026017

  • Gravity-induced entanglement in optomechanical systems Reviewed International journal

    Akira Matsumura, Kazuhiro Yamamoto

    PHYSICAL REVIEW D   102 ( 10 )   2020.11

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    DOI: 10.1103/PhysRevD.102.106021

    Other Link: https://journals.aps.org/prd/abstract/10.1103/PhysRevD.102.106021

  • Fluctuation-dissipation and correlation-propagation relations in (1 + 3)D moving detector-quantum field systems Reviewed International journal

    Jen-Tsung Hsiang, B. L. Hu, Shih-Yuin Lin, Kazuhiro Yamamoto

    Physics Letter B   795 ( 795 )   694 - 699   2019.8

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    Fluctuation-dissipation and correlation-propagation relations in (1 + 3)D moving detector-quantum field systems
    The fluctuation-dissipation relations (FDR) are powerful relations which can capture the essence of the interplay between a system and its environment. Challenging problems of this nature which FDRs aid in our understanding include the backreaction of quantum field processes like particle creation on the spacetime dynamics in early universe cosmology or quantum black holes. The less familiar, yet equally important correlation-propagation relations (CPR) relate the correlations of stochastic forces on different detectors to the retarded and advanced parts of the radiation propagated in the field. Here, we analyze a system of N uniformly-accelerated Unruh-DeWitt detectors whose internal degrees of freedom (idf) are minimally coupled to a real, massless, scalar field in 4D Minkowski space, extending prior work in 2D with derivative coupling. Using the influence functional formalism, we derive the stochastic equations describing the nonequilibrium dynamics of the idfs. We show after the detector-field dynamics has reached equilibration the existence of the FDR and the CPR for the detectors, which combine to form a generalized fluctuation-dissipation matrix relation. We show explicitly the energy flows between the constituents of the system of detectors and between the system and the quantum field environment. This power balance anchors the generalized FDR. We anticipate this matrix relation to provide a useful guardrail in expounding some basic issues in relativistic quantum information, such as ensuring the self-consistency of the energy balance and tracking the quantum information transfer in the detector-field system.

    DOI: 10.1016/j.physletb.2019.06.062

  • Vacuum state in de Sitter spacetime with static charts Reviewed International journal

    Atsushi Higuchi, Kazuhiro Yamamoto

    Physical Review D   98 ( 6 )   065014-1 - 065014-12   2018.9

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    Vacuum state in de Sitter spacetime with static charts
    We study the free massive scalar field in de Sitter spacetime with static charts. In particular, we find positive-frequency modes for the Bunch-Davies vacuum state natural to the static charts as superpositions of the well-known positive-frequency modes in the conformally-flat chart. We discuss in detail how these modes are defined globally in the two static charts and the region in their future. The global structure of these solutions leads to the well-known description of the Bunch-Davies vacuum state as an entangled state. Our results are expected to be useful not only for studying the thermal properties in the vacuum fluctuations in de Sitter spacetime but also for understanding the nonlocal properties of the vacuum state.

    DOI: 10.1103/PhysRevD.98.065014

  • Large Angle CMB Anisotropy in an Open Universe in the One-Bubble inflationary Scenario Reviewed International journal

    Astrophysical Journal   455 ( 2 )   412 - 418   1995.4

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    Large Angle CMB Anisotropy in an Open Universe in the One-Bubble inflationary Scenario
    We consider an alternative scenario of inflation which can account for a spatially open universe. It is similar to the old inflation in which the bubble nucleation occurs in the sea of the false vacuum, but it differs from the old inflation in that the second slow rollover inflation occurs inside a nucleated bubble. Hence, our observable universe is entirely contained in one nucleated bubble. The significance of the scenario is that apart from a variance caused by model parameters, it gives us a definite prediction on the spectrum of the primordial density perturbations, and hence it is observationally testable. Here we investigate the spectrum of cosmic microwave background anisotropies on large angular scales. We find that the contribution from peculiar modes which never appear in the usual harmonic analysis is significant in the case Ω0 ≲ 0.1.

    DOI: 10.1086/176588

  • Quantum signature of gravity in optomechanical systems with conditional measurement Reviewed International journal

    Daisuke Miki, Akira Matsumura, Kazuhiro Yamamoto

    Physical Reiview D   109   064090-1 - 064090-12   2024.3

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    DOI: 10.1103/PhysRevD.109.064090

  • Violation of the two-time Leggett-Garg inequalities for a coarse-grained quantum field Reviewed International journal

    Masaki Tani, Kosei Hatakeyama, Daisuke Miki, Yuki Yamasaki, Kazuhiro Yamamoto

    Physical Reiview A   109   032213-1 - 032213-11   2024.3

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    DOI: 10.1103/PhysRevA.109.032213

  • Classical gravitational effect on the standard quantum limit of finite-size optical lattice clocks in estimating gravitational potential Reviewed International journal

    Fumiya Nishimura, Yui Kuramochi, Kazuhiro Yamamoto

    Physical Review A   108   063112-1 - 063112-11   2023.12

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  • Quantum uncertainty of gravitational field and entanglement in superposed massive particles Reviewed International journal

    Yuuki Sugiyama, Akira Matsumura, Kazuhiro Yamamoto

    Physical Review D   108   105019-1 - 105019-1   2023.11

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    DOI: 10.1103/PhysRevD.108.105019

  • Effective description of a suspended mirror coupled to cavity light: Limitations of Q enhancement due to normal-mode splitting by an optical spring

    Yuuki Sugiyama, Tomoya Shichijo, Nobuyuki Matsumoto, Akira Matsumura, Daisuke Miki, Kazuhiro Yamamoto

    Physical Review A   107 ( 3 )   2023.3

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    DOI: 10.1103/PhysRevA.107.033515

  • Generating quantum entanglement between macroscopic objects with continuous measurement and feedback control

    Daisuke Miki, Nobuyuki Matsumoto, Akira Matsumura, Tomoya Shichijo, Yuuki Sugiyama, Kazuhiro Yamamoto, Naoki Yamamoto

    Physical Review A   107 ( 3 )   2023.3

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    DOI: 10.1103/PhysRevA.107.032410

  • Massive fermion between two parallel chiral plates

    Ar Rohim, Apriadi Salim Adam, Kazuhiro Yamamoto

    Progress of Theoretical and Experimental Physics   2023 ( 1 )   2023.1

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    DOI: 10.1093/ptep/ptac172

  • Consistency between causality and complementarity guaranteed by the Robertson inequality in quantum field theory

    Yuuki Sugiyama, Akira Matsumura, Kazuhiro Yamamoto

    Physical Review D   106 ( 12 )   2022.12

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    DOI: 10.1103/PhysRevD.106.125002

  • Effects of photon field on entanglement generation in charged particles

    Yuuki Sugiyama, Akira Matsumura, Kazuhiro Yamamoto

    Physical Review D   106 ( 4 )   2022.8

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    DOI: 10.1103/PhysRevD.106.045009

  • Expanding edges of quantum Hall systems in a cosmology language: Hawking radiation from de Sitter horizon in edge modes Reviewed

    Masahiro Hotta, Yasusada Nambu, Yuuki Sugiyama, Kazuhiro Yamamoto, Go Yusa

    PHYSICAL REVIEW D   105 ( 10 )   2022.5

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    DOI: 10.1103/PhysRevD.105.105009

  • Large-scale structure with superhorizon isocurvature dark energy

    Koki Yamashita, Yue Nan, Yuuki Sugiyama, Kazuhiro Yamamoto

    Physical Review D   105 ( 8 )   2022.4

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    DOI: 10.1103/PhysRevD.105.083531

  • Dark energy model with very large-scale inhomogeneity

    Yue Nan, Kazuhiro Yamamoto

    Physical Review D   105 ( 6 )   2022.3

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    DOI: 10.1103/PhysRevD.105.063518

  • Non-Gaussian entanglement in gravitating masses: The role of cumulants

    Daisuke Miki, Akira Matsumura, Kazuhiro Yamamoto

    Physical Review D   105 ( 2 )   2022.1

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    DOI: 10.1103/PhysRevD.105.026011

  • Effects of chiral MIT boundary conditions for a Dirac particle in a box

    Ar Rohim, Kazuhiro Yamamoto

    Progress of Theoretical and Experimental Physics   2021 ( 11 )   2021.11

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    DOI: 10.1093/ptep/ptab122

  • Relativistic quantum bouncing particles in a homogeneous gravitational field

    Ar Rohim, Kazushige Ueda, Kazuhiro Yamamoto, Shih Yuin Lin

    International Journal of Modern Physics D   30 ( 13 )   2021.10

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    DOI: 10.1142/S021827182150098X

  • Neutron star cooling in modified gravity theories

    Akira Dohi, Ryotaro Kase, Rampei Kimura, Kazuhiro Yamamoto, Masa Aki Hashimoto

    Progress of Theoretical and Experimental Physics   2021 ( 9 )   2021.9

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    DOI: 10.1093/ptep/ptab099

  • Entanglement of the vacuum between left, right, future, and past: Dirac spinor in Rindler and Kasner spaces Reviewed International journal

    Kazushige Ueda, Atsushi Higuchi, Kazuhiro Yamamoto, Ar Rohim, Yue Nan

    PHYSICAL REVIEW D   103 ( 12 )   125005-1 - 125005-23   2021.6

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    DOI: 10.1103/PhysRevD.103.125005

    Other Link: https://link.aps.org/doi/10.1103/PhysRevD.103.125005

  • Gravitational waves in Kasner spacetimes and Rindler wedges in Regge-Wheeler gauge: Formulation of Unruh effect Invited Reviewed International journal

    Yuuki Sugiyama, Kazuhiro Yamamoto, Tsutomu Kobayashi

    Physical Review D   103 ( 8 )   083503-1   2021.4

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    DOI: 10.1103/PhysRevD.103.026017

    Other Link: https://journals.aps.org/prd/abstract/10.1103/PhysRevD.103.083503

  • Large-scale inhomogeneity of dark energy produced in the ancestor vacuum Reviewed International journal

    Yue Nan, Kazuhiro Yamamoto, Hajime Aoki, Satoshi Iso, and Daisuke Yamauchi

    PHYSICAL REVIEW D   99 ( 10 )   2019.5

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    DOI: 10.1103/PhysRevD.99.103512

  • Late-time quantum radiation by a uniformly accelerated detector in de Sitter spacetime Reviewed International journal

    Yamaguchi, Shumpei, Tatsukawa, Rumi, Lin, Shih-Yuin, Yamamoto, Kazuhiro

    PHYSICAL REVIEW D   98 ( 10 )   2018.11

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    Late-time quantum radiation by a uniformly accelerated detector in de Sitter spacetime
    We investigate the quantum radiation emitted by a uniformly accelerated Unruh-De Witt detector in de Sitter spacetime. We find that there exists a nonvanishing quantum radiation at late times in the radiation zone of the conformally flat coordinates, whic

    DOI: 10.1103/PhysRevD.98.105012

  • Gravitational redshift in the void-galaxy cross-correlation function in redshift space Reviewed International journal

    Yue Nan, Kazuhiro Yamamoto

    PHYSICAL REVIEW D   98 ( 4 )   2018.8

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    Gravitational redshift in the void-galaxy cross-correlation function in redshift space
    We construct an analytic model for the void-galaxy cross-correlation function that enables theoretical predictions of the dipole signal produced dominantly by the gravitational redshift within voids for the first time. By extending a theoretical formulation for the redshift-space distortion of galaxies to include the second order terms of the galaxy peculiar velocity v and the gravitational potential, we formulate the void-galaxy cross-correlation function multipoles in the redshift space, the monopole ξ0(s), dipole ξ1(s), and quadrupole ξ2(s). We find that the dipole ξ1(s) is dominated by the gravitational redshift, which provides a unique opportunity to detect the gravitational potential of voids. Thus, for the dipole ξ1(s)(s), the gravitational redshift is crucial. Although the higher order effect is almost negligible on the monopole ξ0(s), it has an influence on the quadrupole ξ2(s). The effects from the random velocity of galaxies and the definition of the void center on the dipole signal are also discussed. Our model offers a new theoretical probe for the detection of gravitational redshift with voids and further tests on cosmology and gravity.

    DOI: 10.1103/PhysRevD.98.043527

  • Higher multipoles of the galaxy bispectrum in redshift space Reviewed International journal

    Yue Nan, Kazuhiro Yamamoto, Chiaki Hikage

    Journal of Cosmology and Astroparticle Physics   2018 ( 07 )   038-1   2018.7

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    Higher multipoles of the galaxy bispectrum in redshift space
    As a generalization of our previous work [Phys. Rev. D 95 (2017) 043528], in which an analytic model for the galaxy bispectrum in redshift space was developed on the basis of the halo approach, we here investigate its higher multipoles that have not been known so far. The redshift-space bispectrum includes the two variables ω and φ for the line-of-sight direction, and the higher multipole bispectra are defined by the coefficients in the expansion of the redshift-space bispectrum using the spherical harmonics. We find 6 new nonvanishing components out of 25 total components up to ℓ=4, in addition to 3 components discussed in the previous work (monopole, quadruple, and hexadecapole of m=0). The characteristic behaviors of the new nonvanishing multipoles are compared with the results of galaxy mock catalogs that match the halo occupation distribution of the Sloan Digital Sky Survey Baryonic Oscillation Spectroscopic Survey low-redshift sample. We find that the multipoles with m≠ 0 are also sensitive to redshift-space distortion (RSD) as well as those with m=0 and thus are key ingredients in the RSD analysis using the galaxy bispectrum. Analytic approximation formulas for these nonzero components are also presented; these are useful for understanding the characteristic behaviors.

    DOI: 10.1088/1475-7516/2018/07/038

  • Gravitational redshifts of clusters and voids Reviewed

    Daiki Sakuma, Ayumu Terukina, Kazuhiro Yamamoto, Chiaki Hikage

    Physical Review D   97 ( 6 )   2018.3

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    DOI: 10.1103/PhysRevD.97.063512

  • Entanglement of the vacuum between left, right, future, and past: The origin of entanglement-induced quantum radiation Reviewed

    Atsushi Higuchi, Satoshi Iso, Kazushige Ueda, Kazuhiro Yamamoto

    PHYSICAL REVIEW D   96 ( 8 )   2017.10

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    DOI: 10.1103/PhysRevD.96.083531

  • Path Integral Formulation for Wave Effect in Multilens System Reviewed International journal

    Kazuhiro Yamamoto

    International Journal of Astronomy and Astrophysics   7 ( 3 )   221 - 229   2017.9

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    Path Integral Formulation for Wave Effect in Multilens System

    DOI: 10.4236/ijaa.2017.73018

  • Entanglement-induced quantum radiation Reviewed

    Satoshi Iso, Rumi Tatsukawa, Kazushige Ueda, Kazuhiro Yamamoto

    PHYSICAL REVIEW D   96 ( 4 )   2017.8

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    DOI: 10.1103/PhysRevD.96.045001

  • Unruh Radiation Produced by a Uniformly Accelerating Charged Particle in Thermal Random Motions

    Naritaka Oshita, Kazuhiro Yamamoto, Sen Zhang

    Everything about Gravity, Proceedings of the Second LeCosPA International Symposium   584 - 589   2017.3

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    Unruh Radiation Produced by a Uniformly Accelerating Charged Particle in Thermal Random Motions

    DOI: 10.1142/9789813203952_0082

  • Analytic halo approach to the bispectrum of galaxies in redshift space Reviewed

    Kazuhiro Yamamoto, Yue Nan, Chiaki Hikage

    PHYSICAL REVIEW D   95 ( 4 )   2017.2

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    DOI: 10.1103/PhysRevD.95.043528

  • Quantum radiation produced by the entanglement of quantum fields Reviewed

    Satoshi Iso, Naritaka Oshita, Rumi Tatsukawa, Kazuhiro Yamamoto, Sen Zhang

    PHYSICAL REVIEW D   95 ( 2 )   2017.1

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    DOI: 10.1103/PhysRevD.95.023512

  • Constraint on ghost-free bigravity from gravitational Cherenkov radiation Reviewed

    Rampei Kimura, Takahiro Tanaka, Kazuhiro Yamamoto, Yasuho Yamashita

    PHYSICAL REVIEW D   94 ( 6 )   2016.9

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    DOI: 10.1103/PhysRevD.94.064059

  • Constraints on alpha-attractor inflation and reheating Reviewed

    Yoshiki Ueno, Kazuhiro Yamamoto

    PHYSICAL REVIEW D   93 ( 8 )   2016.4

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    DOI: 10.1103/PhysRevD.93.083524

  • Quantum radiation produced by a uniformly accelerating charged particle in thermal random motion Reviewed

    Naritaka Oshita, Kazuhiro Yamamoto, Sen Zhang

    PHYSICAL REVIEW D   93 ( 8 )   085016-1 - 085016-7   2016.4

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    DOI: 10.1103/PhysRevD.93.085016

  • Perturbed Newtonian description of the Lemaitre model with non-negligible pressure Reviewed International journal

    Kazuhiro Yamamoto, Valerio Marra, Viatcheslav Mukhanov, Misao Sasaki

    JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS   ( 3 )   2016.3

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    DOI: 10.1088/1475-7516/2016/03/030

  • Fingers-of-God effect of infalling satellite galaxies Reviewed

    Chiaki Hikage, Kazuhiro Yamamoto

    MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY   455 ( 1 )   L77 - L81   2016.1

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    DOI: 10.1093/mnrasl/slv153

  • Constraint on modified dispersion relations for gravitational waves from gravitational Cherenkov radiation Reviewed

    Satoshi Kiyota, Kazuhiro Yamamoto

    PHYSICAL REVIEW D   92 ( 10 )   2015.11

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    DOI: 10.1103/PhysRevD.92.104036

  • Third order solutions of cosmological density perturbations in Horndeski's most general scalar-tensor theory with the Vainshtein mechanism Reviewed

    Yuichiro Takushima, Ayumu Terukina, Kazuhiro Yamamoto

    PHYSICAL REVIEW D   92 ( 10 )   2015.11

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    DOI: 10.1103/PhysRevD.92.104033

  • Testing a generalized cubic Galileon gravity model with the Coma Cluster Reviewed

    Ayumu Terukina, Kazuhiro Yamamoto, Nobuhiro Okabe, Kyoko Matsushita, Toru Sasaki

    JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS   ( 10 )   2015.10

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    DOI: 10.1088/1475-7516/2015/10/064

  • Quantum radiation from a particle in an accelerated motion coupled to vacuum fluctuations Reviewed

    Naritaka Oshita, Kazuhiro Yamamoto, Sen Zhang

    PHYSICAL REVIEW D   92 ( 4 )   2015.8

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    DOI: 10.1103/PhysRevD.92.045027

  • What can we learn from higher multipole power spectra of galaxy distribution in redshift space? Reviewed

    Tatsuro Kanemaru, Chiaki Hikage, Gert Huesi, Ayumu Terukina, Kazuhiro Yamamoto

    PHYSICAL REVIEW D   92 ( 2 )   2015.7

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    DOI: 10.1103/PhysRevD.92.023523

  • Thermal property in Brownian motion of a particle coupled to vacuum fluctuations Reviewed

    Naritaka Oshita, Kazuhiro Yamamoto, Sen Zhang

    PHYSICAL REVIEW D   89 ( 12 )   2014.6

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    DOI: 10.1103/PhysRevD.89.124028

  • Cosmology of the proxy theory to massive gravity Reviewed International journal

    Heisenberg, Lavinia; Kimura, Rampei; Yamamoto, Kazuhiro

    PHYSICAL REVIEW D   89 ( 10 )   2014.5

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    Cosmology of the proxy theory to massive gravity
    In this paper, we scrutinize very closely the cosmology in the proxy theory to massive gravity obtained in de Rham and Heisenberg [Phys. Rev. D 84, 043503 (2011)]. This proxy theory was constructed by covariantizing the decoupling limit Lagrangian of massive gravity, and it represents a subclass of Horndeski scalar-tensor theory. Thus, this covariantization unifies two important classes of modified gravity theories, namely, massive gravity and Horndeski theories. We go beyond the regime which was studied in de Rham and Heisenberg [Phys. Rev. D 84, 043503 (2011)] and show that the theory does not admit any homogeneous and isotropic self-accelerated solutions. We illustrate that the only attractor solution is the flat Minkowski solution; hence, this theory is less appealing as a dark energy model. We also show that the absence of de Sitter solutions is tightly related to the presence of shift symmetry breaking interactions. © 2014 American Physical Society.

    DOI: 10.1103/PhysRevD.89.103008

  • Bispectrum of cosmological density perturbations in the most general second-order scalar-tensor theory Reviewed International journal

    Takushima, Yuichiro; Terukina, Ayumu; Yamamoto, Kazuhiro

    PHYSICAL REVIEW D   89 ( 10 )   2014.5

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    Bispectrum of cosmological density perturbations in the most general second-order scalar-tensor theory
    We study the bispectrum of matter density perturbations induced by the large-scale structure formation in the most general second-order scalar-tensor theory that may possess the Vainshtein mechanism as a screening mechanism. On the basis of the standard perturbation theory, we derive the bispectrum being expressed by a kernel of the second-order density perturbations. We find that the leading-order kernel is characterized by one parameter, which is determined by the solutions of the linear density perturbations, the Hubble parameter, and the other function specifying nonlinear interactions. This is because our model, which may be equipped with the Vainshtein mechanism, includes only one simple function that describes mode couplings of the nonlinear interactions. This feature does not allow for varied behavior in the bispectrum of the matter density perturbations in the most general second-order scalar-tensor theory equipped with the Vainshtein mechanism. We exemplify the typical behavior of the bispectrum in a kinetic gravity braiding model. © 2014 American Physical Society.

    DOI: 10.1103/PhysRevD.89.104007

  • Testing chameleon gravity with the Coma cluster Reviewed

    Ayumu Terukina, Lucas Lombriser, Kazuhiro Yamamoto, David Bacon, Kazuya Koyama, Robert C. Nichol

    JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS   ( 4 )   2014.4

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    DOI: 10.1088/1475-014/04/013

  • Simultaneous constraints on the growth of structure and cosmic expansion from the multipole power spectra of the SDSS DR7 LRG sample Reviewed International journal

    Oka, Akira; Saito, Shun; Nishimichi, Takahiro; Taruya, Atsushi; Yamamoto, Kazuhiro

    MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY   439 ( 3 )   2515 - 2530   2014.4

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    Simultaneous constraints on the growth of structure and cosmic expansion from the multipole power spectra of the SDSS DR7 LRG sample
    The anisotropic galaxy clustering on large scales provides us with a unique opportunity to probe into the gravity theory through the redshift-space distortions (RSDs) and theAlcock-Paczynski effect. Using the multipole power spectra up to hexadecapole (ℓ = 4), of the luminous red galaxy (LRG) sample in the Data Release 7 (DR7) of the Sloan Digital Sky Survey II (SDSS-II), we obtain simultaneous constraints on the linear growth rate f, angular diameter distance DA, and Hubble parameter H at redshift z = 0.3. For this purpose, we first extensively examine the validity of a theoretical model for the non-linear RSDs using mock subhalo catalogues from N-body simulations, which are constructed to match with the observed multipole power spectra. We show that the input cosmological parameters of the simulations can be recovered well within the error bars by comparing the multipole power spectra of our theoretical model and those of the mock subhalo catalogues. We also carefully examine systematic uncertainties in our analysis by testing the dependence on prior assumption of the theoretical model and the range ofwavenumbers to be used in the fitting. These investigations validate that the theoretical model can be safely applied to the real data. Thus, our results from the SDSS DR7 LRG sample are robust including systematics of theoretical modelling; f(z = 0.3)7sigma; 8(z = 0.3) = 0.49 ± stat.0.08 ± sys.0.04, DA(z = 0.3) = 968 ± stat.42 ± sys.17 (Mpc), H(z = 0.3) = 81.7 ± stat.5.0 ± sys.3.7 (km s-1 Mpc-1). We believe that our method to constrain the cosmological parameters using subhaloes catalogues will be useful for more refined samples like CMASS and LOWZ catalogues in the Baryon Oscillation Spectroscopic Survey in SDSS-III. © 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society.

    DOI: 10.1093/mnras/stu111

  • Impacts of satellite galaxies on the redshift-space distortions Reviewed

    Chiaki Hikage, Kazuhiro Yamamoto

    JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS   ( 8 )   2013.8

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    DOI: 10.1088/1475-7516/2013/08/019

  • On the cancellation mechanism of radiation from the Unruh detector Reviewed

    Satoshi Iso, Kazuhiro Yamamoto, Sen Zhang

    PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS   ( 6 )   2013.6

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    DOI: 10.1093/ptep/ptt040

  • Window effect in the power spectrum analysis of a galaxy redshift survey Reviewed International journal

    Takahiro Sato, Gert Huetsi, Gen Nakamura, Kazuhiro Yamamoto

    Int.J.Astron.Astrophys   3   243 - 256   2013.4

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    DOI: 10.4236/ijaa.2013.33029

  • Gas Density Profile in Dark Matter Halo in Chameleon Cosmology Reviewed

    Ayumu Terukina, Kazuhiro Yamamoto

    PHYSICAL REVIEW D   86 ( 10 )   2012.11

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    DOI: 10.1103/PhysRevD.86.103503

  • QUANTUM LARMOR RADIATION FROM A MOVING CHARGE IN AN ELECTROMAGNETIC PLANE WAVE BACKGROUND Reviewed

    Gen Nakamura, Kazuhiro Yamamoto

    INTERNATIONAL JOURNAL OF MODERN PHYSICS A   27 ( 24 )   2012.9

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    DOI: 10.1142/S0217751X12501424

  • Constraints on general second-order scalar-tensor models from gravitational Cherenkov radiation Reviewed

    Rampei Kimura, Kazuhiro Yamamoto

    JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS   7 ( 7 )   50   2012.7

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    DOI: 10.1088/1475-7516/2012/07/050

  • Observational constraints on kinetic gravity braiding from the integrated Sachs-Wolfe effect Reviewed

    Rampei Kimura, Tsutomu Kobayashi, Kazuhiro Yamamoto

    PHYSICAL REVIEW D   85 ( 12 )   2012.6

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    DOI: 10.1103/PhysRevD.85.123503

  • Testing gravity with halo density profiles observed through gravitational lensing Reviewed

    Tatsuya Narikawa, Kazuhiro Yamamoto

    JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS   ( 5 )   2012.5

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    DOI: 10.1088/1475-7516/2012/05/016

  • 加速膨張宇宙の発見と展開 Invited

    山本一博

    サイエンスネット   43   10 - 13   2012.5

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  • Vainshtein screening in a cosmological background in the most general second-order scalar-tensor theory Reviewed

    Rampei Kimura, Tsutomu Kobayashi, Kazuhiro Yamamoto

    PHYSICAL REVIEW D   85 ( 2 )   2012.1

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    DOI: 10.1103/PhysRevD.85.024023

  • HALO MODELS IN MODIFIED GRAVITY THEORIES WITH SELF-ACCELERATED EXPANSION Reviewed

    Tatsuya Narikawa, Rampei Kimura, Tatsunosuke Yano, Kazuhiro Yamamoto

    INTERNATIONAL JOURNAL OF MODERN PHYSICS D   20 ( 12 )   2383 - 2397   2011.11

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    DOI: 10.1142/S0218271811020421

  • Large scale structures in the kinetic gravity braiding model that can be unbraided Reviewed

    Rampei Kimura, Kazuhiro Yamamoto

    JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS   ( 4 )   2011.4

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    DOI: 10.1088/1475-7516/2011/04/025

  • ANALYTIC APPROACH TO PERTURBED EINSTEIN RING WITH ELLIPTICAL NFW LENS MODEL Reviewed

    Yuta Habara, Kazuhiro Yamamoto

    INTERNATIONAL JOURNAL OF MODERN PHYSICS D   20 ( 3 )   371 - 400   2011.3

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    DOI: 10.1142/S0218271811018834

  • Quantum Larmor radiation in a conformally flat universe Reviewed

    Rampei Kimura, Gen Nakamura, Kazuhiro Yamamoto

    PHYSICAL REVIEW D   83 ( 4 )   2011.2

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    DOI: 10.1103/PhysRevD.83.045015

  • First-order quantum correction to the Larmor radiation from a moving charge in a spatially homogeneous time-dependent electric field Reviewed

    Kazuhiro Yamamoto, Gen Nakamura

    PHYSICAL REVIEW D   83 ( 4 )   2011.2

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    DOI: 10.1103/PhysRevD.83.045030

  • Deconvolution of Window Effect in Galaxy Power Spectrum Analysis Reviewed

    Takahiro Sato, Gert Huetsi, Kazuhiro Yamamoto

    PROGRESS OF THEORETICAL PHYSICS   125 ( 1 )   187 - 197   2011.1

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    DOI: 10.1143/PTP.125.187

  • Erratum: Characterizing the linear growth rate of cosmological density perturbations in an f(R) model (Physical Review D - Particles, Fields, Gravitation and Cosmology (2010) 81 (043528))

    Tatsuya Narikawa, Kazuhiro Yamamoto

    Physical Review D - Particles, Fields, Gravitation and Cosmology   81 ( 12 )   2010.6

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    DOI: 10.1103/PhysRevD.81.129903

  • Constraint on the cosmological f(R) model from the multipole power spectrum of the SDSS luminous red galaxy sample and prospects for a future redshift survey Reviewed

    Kazuhiro Yamamoto, Gen Nakamura, Gert Hutsi, Tatsuya Narikawa, Takahiro Sato

    PHYSICAL REVIEW D   81 ( 10 )   2010.5

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    DOI: 10.1103/PhysRevD.81.103517

  • Characterizing the linear growth rate of cosmological density perturbations in an f(R) model Reviewed

    Tatsuya Narikawa, Kazuhiro Yamamoto

    Physical Review D - Particles, Fields, Gravitation and Cosmology   81 ( 4 )   2010.2

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    DOI: 10.1103/PhysRevD.81.043528

  • Constraint on the growth factor of the cosmic structure from the damping of the baryon acoustic oscillation signature Reviewed

    Gen Nakamura, Gert Hutsi, Takahiro Sato, Kazuhiro Yamamoto

    PHYSICAL REVIEW D   80 ( 12 )   2009.12

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    DOI: 10.1103/PhysRevD.80.123524

  • Breaking the scale invariance of the primordial power spectrum in Horava-Lifshitz cosmology Reviewed

    Kazuhiro Yamamoto, Tsutomu Kobayashi, Gen Nakamura

    PHYSICAL REVIEW D   80 ( 6 )   2009.9

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    DOI: 10.1103/PhysRevD.80.063514

  • Confronting the damping of the baryon acoustic oscillations with observation Reviewed

    Physical Review D - Particles, Fields, Gravitation and Cosmology   79 ( 6 )   2009.3

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    DOI: 10.1103/PhysRevD.79.063512

  • Damping of the baryon acoustic oscillations in the matter power spectrum as a probe of the growth factor Reviewed

    Hidenori Nomura, Kazuhiro Yamamoto, Takahiro Nishimichi

    JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS   ( 10 )   2008.10

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    DOI: 10.1088/1475-7516/2008/10/031

  • Testing General Relativity with the Multipole Spectra of the SDSS Luminous Red Galaxies Reviewed

    Kazuhiro Yamamoto, Takahiro Sato, Gert Hutsi

    PROGRESS OF THEORETICAL PHYSICS   120 ( 3 )   609 - 614   2008.9

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    DOI: 10.1143/PTP.120.609

  • Astrophysical condition on the attolensing as a possible probe for a modified gravity theory Reviewed

    Takahiro Sato, Bobby E. Gunara, Kazuhiro Yamamoto, Freddy P. Zen

    INTERNATIONAL JOURNAL OF MODERN PHYSICS A   23 ( 1 )   167 - 179   2008.1

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    DOI: 10.1142/S0217751X08038093

  • Characteristic scales of baryon acoustic oscillations from perturbation theory: Nonlinearity and redshift-space distortion effects Reviewed

    Takahiro Nishimichi, Hiroshi Ohmur, Masashi Nakamichi, Atsushi Taruya, Kazuhiro Yahata, Akihito Shirata, Shun Saito, Hidenori Nomura, Kazuhiro Yamamoto, Yasushi Suto

    PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN   59 ( 6 )   1049 - 1060   2007.12

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    DOI: 10.1093/pasj/59.6.1049

  • Erratum: Optimizing future imaging survey of galaxies to confront dark energy and modified gravity models (Physical Review D - Particles, Fields, Gravitation and Cosmology (2007) 76, (023504))

    Kazuhiro Yamamoto, David Parkinson, Takashi Hamana, Robert C. Nichol, Yasushi Suto

    Physical Review D - Particles, Fields, Gravitation and Cosmology   76 ( 12 )   2007.12

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    DOI: 10.1103/PhysRevD.76.129901

  • Optimizing future imaging survey of galaxies to confront dark energy and modified gravity models Reviewed

    Kazuhiro Yamamoto, David Parkinson, Takashi Hamana, Robert C. Nichol, Yasushi Suto

    Physical Review D - Particles, Fields, Gravitation and Cosmology   76 ( 2 )   2007.7

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    DOI: 10.1103/PhysRevD.76.023504

  • Classical and quantum radiation from a moving charge in an expanding universe Reviewed

    Hidenori Nomura, Misao Sasaki, Kazuhiro Yamamoto

    JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS   ( 11 )   2006.11

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    DOI: 10.1088/1475-7516/2006/11/013

  • Searching for modified gravity with baryon oscillations: From SDSS to wide field multiobject spectroscopy (WFMOS) Reviewed

    Kazuhiro Yamamoto, Bruce A. Bassett, Robert C. Nichol, Yasushi Suto, Kazuhiro Yahata

    PHYSICAL REVIEW D   74 ( 6 )   2006.9

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    DOI: 10.1103/PhysRevD.74.063525

  • A measurement of the quadrupole power spectrum in the clustering of the 2dF QSO survey Reviewed

    K Yamamoto, M Nakamichi, A Kamino, BA Bassett, H Nishioka

    PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN   58 ( 1 )   93 - 102   2006.2

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    DOI: 10.1093/pasj/58.1.93

  • The finite source size effect and wave optics in gravitational lensing - art. no. 023 Reviewed

    N Matsunaga, K Yamamoto

    JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS   ( 1 )   2006.1

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    DOI: 10.1088/1475-7516/2006/01/023

  • Non-Gaussianity in multi-field stochastic inflation with the scaling approximation Reviewed

    T Hattori, K Yamamoto

    JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS   ( 7 )   2005.7

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    DOI: 10.1088/1475-7516/2005/07/005

  • Modulation of a chirp gravitational wave from a compact binary due to gravitational lensing Reviewed

    K Yamamoto

    PHYSICAL REVIEW D   71 ( 10 )   2005.5

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    DOI: 10.1103/PhysRevD.71.101301

  • Dark energy reflections in the redshift-space quadrupole Reviewed

    K Yamamoto, BA Bassett, H Nishioka

    PHYSICAL REVIEW LETTERS   94 ( 5 )   051302   2005.2

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    DOI: 10.1103/PhysRevLett.94.051301

  • Power spectrum analysis of the two-degree field QSO sample revisited Reviewed

    K Yamamoto

    ASTROPHYSICAL JOURNAL   605 ( 2 )   620 - 624   2004.4

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    DOI: 10.1086/382496

  • Optimal weighting scheme in redshift-space power spectrum analysis and a prospect for measuring the cosmic equation of state Reviewed

    K Yamamoto

    ASTROPHYSICAL JOURNAL   595 ( 2 )   577 - 588   2003.10

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    DOI: 10.1086/377488

  • Covariant Wigner function approach to the Boltzmann equation for mixing fermions in curved space-time Reviewed International journal

    Yamamoto, K

    INTERNATIONAL JOURNAL OF MODERN PHYSICS A   18 ( 24 )   4469 - 4484   2003.9

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  • Wave effect in gravitational lensing by a cosmic string Reviewed International journal

    Yamamoto, K; Tsunoda, K

    PHYSICAL REVIEW D   68 ( 4 )   2003.8

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    DOI: 10.1103/PhysRevD.68.041302

  • Measuring cosmological parameters with the SDSS QSO spatial power spectrum analysis to test the cosmological principle Reviewed

    K Yamamoto

    MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY   341 ( 4 )   1199 - 1204   2003.6

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    DOI: 10.1046/j.1365-8711.2003.06477.x

  • Cosmological constraint from the 2dF QSO spatial power spectrum Reviewed

    K Yamamoto

    MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY   334 ( 4 )   958 - 962   2002.8

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    DOI: 10.1046/j.1365-8711.2002.05575.x

  • Feasibility of probing dark energy with strong gravitational lensing systems - Fisher-Matrix approach Reviewed

    K Yamamoto, Y Kadoya, T Murata, T Futamase

    PROGRESS OF THEORETICAL PHYSICS   106 ( 5 )   917 - 928   2001.11

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    DOI: 10.1143/PTP.106.917

  • Explicit derivation of the fluctuation-dissipation relation of the vacuum noise in the N-dimensional de Sitter space-time Reviewed

    T Murata, K Tsunoda, K Yamamoto

    INTERNATIONAL JOURNAL OF MODERN PHYSICS A   16 ( 16 )   2841 - 2857   2001.6

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    DOI: 10.1142/S0217751X01004244

  • Possible method to reconstruct the cosmic equation of state from strong gravitational lensing systems Reviewed

    K Yamamoto, T Futamase

    PROGRESS OF THEORETICAL PHYSICS   105 ( 5 )   707 - 716   2001.5

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    DOI: 10.1143/PTP.105.707

  • Isodensity statistics on clustering of high-z objects in cosmological redshift spaces Reviewed

    A Taruya, K Yamamoto

    ASTROPHYSICAL JOURNAL   550 ( 2 )   528 - 546   2001.4

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    DOI: 10.1086/319795

  • Can the geometric test probe the cosmic equation of state? Reviewed

    K Yamamoto, H Nishioka

    ASTROPHYSICAL JOURNAL   549 ( 1 )   L15 - L19   2001.3

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    DOI: 10.1086/319135

  • Nonlinear evolution of very small scale cosmological baryon perturbations at recombination Reviewed

    GC Liu, K Yamamoto, N Sugiyama, H Nishioka

    ASTROPHYSICAL JOURNAL   547 ( 1 )   1 - 11   2001.1

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    DOI: 10.1086/318352

  • Redshift-space distortions of the power spectrum of cosmological objects on a light cone: Explicit formulations and theoretical implications Reviewed

    H Nishioka, K Yamamoto

    ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES   128 ( 1 )   1 - 16   2000.5

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    DOI: 10.1086/313381

  • Two-point correlation functions of X-ray-selected clusters of galaxies: Theoretical predictions for flux-limited surveys Reviewed

    Y Suto, K Yamamoto, T Kitayama, YP Jing

    ASTROPHYSICAL JOURNAL   534 ( 2 )   551 - 558   2000.5

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    DOI: 10.1086/308778

  • Light-cone effect on clustering statistics in cosmological redshift space Reviewed

    Y Suto, H Magira, K Yamamoto

    PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN   52 ( 2 )   249 - 257   2000.4

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    DOI: 10.1093/pasj/52.2.249

  • Light-cone effect on clustering statistics in cosmological redshift space Reviewed

    Y Suto, H Magira, K Yamamoto

    PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN   52 ( 2 )   249 - 257   2000.4

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    DOI: 10.1093/pasj/52.2.249

  • Curvature-induced phase transitions in the inflationary universe: Supersymmetric Nambu-Jona-Lasinio model in de Sitter spacetime Reviewed International journal

    Hashida, J; Mukaigawa, S; Muta, T; Ohkura, K; Yamamoto, K

    PHYSICAL REVIEW D   61 ( 4 )   2000.2

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  • 宇宙論的赤方偏移歪みを用いた宇宙モデルのテストとバイアスの進化

    山本 一博

    素粒子論研究   101 ( 6 )   F4-F7 - F7   2000.1

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    宇宙論的赤方偏移歪みを用いた宇宙モデルのテスト(宇宙論的幾何学テスト)において考慮すべき観測的効果を取り上げ解説しながら、このテストの問題点について再考する。光円錐効果まで考慮した相関関数の理論的表式を導出し、2dFのクェーサー・サンプルを想定した相関関数の振舞いを定量的に調べる。特に、バイアスの不定性に着目し、バイアスの進化がどの程度相関関数の理論的予言に影響するかについて定量的な議論を試みる。

    DOI: 10.24532/soken.101.6_F4

  • Cosmological Light-Cone Effect on the Power Spectrum of Galaxies and Quasars in Wide-Field Redshift Surveys Reviewed International journal

    Astrophysical Journal   527 ( 2 )   488 - 498   1999.4

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    Cosmological Light-Cone Effect on the Power Spectrum of Galaxies and Quasars in Wide-Field Redshift Surveys

  • Two-point correlation functions of high-redshift objects; an explicit formulation on a light-cone hypersurface Reviewed International journal

    Astrophysical Journal   517 ( 1 )   1 - 12   1999.4

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    Two-point correlation functions of high-redshift objects; an explicit formulation on a light-cone hypersurface
    While all the cosmological observations are carried out on a light cone, the null hypersurface of an observer at z = 0, the clustering statistics has been properly defined only on the constant-time hypersurface. We develop a theoretical formulation for a two-point correlation function on the light cone and derive a practical approximate expression relevant to the discussion of clustering of high-redshift objects at large separations. As a specific example, we present predictions of the two-point correlation function for the Durham/AAT, SDSS, and 2dF quasar catalogues. We also briefly discuss the effects of adopted luminosity function, cosmological parameters, and bias models on the correlation function on the light cone.

    DOI: 10.1086/307184

  • Two-Point Correlation Function of High-Redshift Objects on a Light-Cone ;Effect of the Linear Redshift-Space Distortion Reviewed International journal

    Astrophysical Journal   520 ( 2 )   426 - 436   1999.4

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    Two-Point Correlation Function of High-Redshift Objects on a Light-Cone ;Effect of the Linear Redshift-Space Distortion
    A theoretical formulation for the two-point correlation function on a light cone is developed in red-shift space. On the basis of the previous work by Yamamoto & Suto, in which a theoretical formula for the two-point correlation function on a light cone has been developed in real space, we extend it to the formula in redshift space by taking the peculiar velocity of the sources into account. A simple expression for the two-point correlation function is derived. We briefly discuss QSO correlation functions on a light cone adopting a simple model of the sources.

    DOI: 10.1086/307492

  • Model of curvature-induced phase transitions in the inflationary universe Reviewed

    J. Hashida, S. Mukaigawa, T. Muta, K. Ohkura, K. Yamamoto

    Physical Review D - Particles, Fields, Gravitation and Cosmology   59 ( 10 )   101302-1-101302-4   1999.4

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    DOI: 10.1103/PhysRevD.59.101302

  • Deciphering Cosmological Information from Redshift Surveys of High-z Objects: The Cosmological Light-Cone Effect and Redshift-Space Distortion Reviewed International journal

    Yasushi Suto Hiromitsu Magira Y. P. Jing Takahiko Matsubara Kazuhiro Yamamoto

    Progress of Theoretical Physics Supplement   133   183 - 210   1999.4

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    DOI: 10.1143/PTPS.133.183

  • Small-scale fluctuations in cosmic X-ray background ; A power spectrum approach Reviewed International journal

    Physical Review   D58 ( 10 )   103508-1-103508-9 - 1-103508-9   1998.4

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    Small-scale fluctuations in cosmic X-ray background ; A power spectrum approach

    DOI: 10.1103/PhysRevD.58.103508

  • Evolution of Small Scale Cosmological Baryon Perturbations and Matter Transfer Functions Reviewed International journal

    Astrophysical Journal   501 ( 2 )   442 - 460   1998.4

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    Evolution of Small Scale Cosmological Baryon Perturbations and Matter Transfer Functions
    The evolution of small-scale cosmological perturbations is carefully reexamined. Through interactions with photons via electrons, baryon perturbations show interesting behavior on some physical scales. Characteristic features of the evolution of baryon density fluctuations are discussed. In CDM models, a power-law growing phase of the small-scale baryon density fluctuations is found, characterized by a terminal velocity after the diffusion (Silk) damping and before the decoupling epoch. A transfer function for total matter-density fluctuations is then studied by taking those physical processes into account. We present an analytic transfer function as a function of redshift z that is applicable for the entire range up to a solar-mass scale in the high-z universe, and that is also suitable for high baryon fraction models.

    DOI: 10.1086/305841

  • Boltzmann approach to the large-angle cosmic X-ray background fluctuations Reviewed International journal

    Monthly Notices of the Royal Astronomical Society   298 ( 2 )   471 - 482   1998.4

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    Boltzmann approach to the large-angle cosmic X-ray background fluctuations

    DOI: 10.1046/j.1365-8711.1998.01647.x

  • Dynamical symmetry breaking in compact flat spaces Reviewed International journal

    Ishikawa, KI; Inagaki, T; Fukazawa, K; Yamamoto, K

    PROGRESS OF THEORETICAL PHYSICS   99 ( 2 )   237 - 255   1998.2

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    DOI: 10.1143/PTP.99.237

  • On the Cosmic X-ray Background Fluctuations

    98   A106-A108   1998.1

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    On the Cosmic X-ray Background Fluctuations

  • Cosmological baryon sound waves coupled with the primeval radiation Reviewed International journal

    Yamamoto, Kazuhiro; Sugiyama, Naoshi; Sato, Humitaka

    PHYSICAL REVIEW D   56 ( 12 )   7566 - 7577   1997.12

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1103/PhysRevD.56.7566

  • Observational tests of one-bubble open inflationary cosmological models Reviewed International journal

    Yamamoto, K; Bunn, EF

    ASTROPHYSICAL JOURNAL   464 ( 1 )   8 - 17   1996.6

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1086/177295

  • Quantum excitations of intrinsic degrees of freedom in multi-dimensional tunneling system Reviewed International journal

    Progress of Theoretical Physics   96 ( 6 )   1147 - 1163   1996.4

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    Quantum excitations of intrinsic degrees of freedom in multi-dimensional tunneling system

    DOI: 10.1143/PTP.96.1147

  • Quantum fluctuations and CMB anisotropies in one bubble inflationary models Reviewed International journal

    Physical Review   D54 ( 8 )   5031 - 5048   1996.4

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    Quantum fluctuations and CMB anisotropies in one bubble inflationary models

    DOI: 10.1103/PhysRevD.54.5031

  • Self-excitation of the tunneling scalar field in false vacuum decay Reviewed International journal

    Hamazaki, T; Sasaki, M; Tanaka, T; Yamamoto, K

    PHYSICAL REVIEW D   53 ( 4 )   2045 - 2061   1996.2

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1103/PhysRevD.53.2045

  • Euclidean Vacuum mode function in an open slicing chart of de Sitter spacetime Reviewed International journal

    Physical Review   D51   2979 - 2995   1995.4

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    Euclidean Vacuum mode function in an open slicing chart of de Sitter spacetime

    DOI: 10.1103/PhysRevD.51.2979

    Other Link: https://journals.aps.org/prd/pdf/10.1103/PhysRevD.51.2979

  • Particle Spectrum Created through Bubble Nucleation and Quantum Field Theory in the Milne Universe Reviewed International journal

    Physical Review   51 ( 6 )   2968 - 2978   1995.4

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    Particle Spectrum Created through Bubble Nucleation and Quantum Field Theory in the Milne Universe

    DOI: 10.1103/PhysRevD.51.2968

    Other Link: https://doi.org/10.1103/PhysRevD.51.2968

  • Skewness of Cosmic Microwave Background Anisotropy in an Inflationary Isocurvature Baryon Model Reviewed International journal

    Astrophysical Journal   435 ( 2 )   L83-L85 - L85   1994.4

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    Skewness of Cosmic Microwave Background Anisotropy in an Inflationary Isocurvature Baryon Model

  • Probability distribution functional in curved spaectime Reviewed International journal

    International Journal of Modern Physics   A9 ( 2 )   221 - 238   1994.4

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    Probability distribution functional in curved spaectime

    DOI: 10.1142/S0217751X9400011X

    Other Link: https://www.worldscientific.com/doi/abs/10.1142/S0217751X9400011X

  • Field Theoretical Description of Quantum Fluctuation in Multi-dimensional Approach Reviewed International journal

    Physical Review   D49   1039 - 1046   1994.4

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    Field Theoretical Description of Quantum Fluctuation in Multi-dimensional Approach

    DOI: 10.1103/PhysRevD.49.1039

    Other Link: https://journals.aps.org/prd/pdf/10.1103/PhysRevD.49.1039

  • Quantum state during and after nucleation of an O(4)-symmetric bubble Reviewed International journal

    Progress of Theoretical Physics   90 ( 5 )   1019 - 1038   1994.4

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    Quantum state during and after nucleation of an O(4)-symmetric bubble

    DOI: 10.1143/ptp/90.5.1019

    Other Link: https://academic.oup.com/ptp/article/90/5/1019/1883964

  • Quantum Tunneling in Multidimensional tunneling systems Reviewed International journal

    Progress of Theoretical Physics   91 ( 3 )   437 - 452   1994.4

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    Quantum Tunneling in Multidimensional tunneling systems

  • Superexpansionary divergence: Breakdown of perturbative quantum field theory in spacetime with accelerated expansion Reviewed International journal

    M. Sasaki, Hiroshi Suzuki, K. Yamamoto, J. Yokoyama

    CLASSICAL AND QUANTUM GRAVITY   10 ( 5 )   L55 - L60   1993.5

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1088/0264-9381/10/5/003

    Other Link: https://iopscience.iop.org/article/10.1088/0264-9381/10/5/003/pdf

  • Quantum state inside a vacuum bubble and creation of an open universe Reviewed International journal

    Physics Letters   B317 ( 4 )   510 - 516   1993.4

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    Quantum state inside a vacuum bubble and creation of an open universe

  • Superexpansionary divergence Reviewed

    Classical and Quantum Gravity   10   L55-L60   1993.4

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    Language:Others   Publishing type:Research paper (scientific journal)  

    Superexpansionary divergence

  • APPARENT HORIZONS OF AN N-BLACK-HOLE SYSTEM IN A SPACE-TIME WITH A COSMOLOGICAL CONSTANT Reviewed

    K NAKAO, K YAMAMOTO, K MAEDA

    PHYSICAL REVIEW D   47 ( 8 )   3203 - 3213   1993.4

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    Language:English   Publishing type:Research paper (scientific journal)  

    Other Link: https://doi.org/10.1103/PhysRevD.47.3203

  • STATISTICS OF BARYON ISOCURVATURE PERTURBATIONS IN THE INFLATIONARY UNIVERSE Reviewed International journal

    YAMAMOTO, K; NAGASAWA, M; SASAKI, M; SUZUKI, H; YOKOYAMA, J

    PHYSICAL REVIEW D   46 ( 10 )   4206 - 4217   1992.11

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.1103/PhysRevD.46.4206

    Other Link: https://doi.org/10.1103/PhysRevD.46.4206

  • Motion of a Spherical Domain Wall and the Large-Scale Structure Formation Reviewed International journal

    yamamoto k, k.tomita

    Progress of Theoretical Physics   86 ( 5 )   1003 - 1020   1992.4

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    Motion of a Spherical Domain Wall and the Large-Scale Structure Formation

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Books

Presentations

  • On the quantum nature of gravity and optomechanical tests Invited

    Kazuhiro Yamamoto

    ExU-YITP Workshop on Holography, Gravity and Quantum Information  2023.9 

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    Event date: 2023.9

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  • 重力・巨視的振動子の量子性とレゲット-ガーグ不等式

    山本一博

    「重力と量子で紡ぐ宇宙」研究会  2023.8 

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    Event date: 2023.8

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:公共の宿しぶき温泉湯楽里、福井   Country:Japan  

  • Feasibility of generating quantum states in optomechanics - Two-mode theory of suspended mirror coupled to cavity light: Wiener filter analysis - International conference

    Kazuhiro Yamamoto

    13th annual Conference on relativistic quantum information (North)  2023.7 

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    Event date: 2023.7

    Language:English   Presentation type:Oral presentation (general)  

    Country:Greece  

  • Toward testing quantum nature of gravity Invited International conference

    Kazuhiro Yamamoto

    Laser Physics Workshop, LPHYS'23  2023.7 

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    Event date: 2023.7

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  • Leggett-Garg inequalities for testing quantumness of gravity and macroscopic system International conference

    Kazuhiro Yamamoto

    "Gravity and Quantum" Workshop, Kyushu University 2023  2023.5 

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    Event date: 2023.5

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  • 重力の量子性の検証に向けた懸架型光学機械振動子の精密理論模型の構築

    山本一博

    Extreme Universe 第二回領域会議  2022.12 

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    Event date: 2022.12

    Language:English   Presentation type:Oral presentation (general)  

    Venue:神戸コンベンションセンター (オンライン)   Country:Japan  

  • Generating quantum entanglement between macroscopic objects with continuous measurement and feedback control: Toward testing quantum nature of gravity Invited International conference

    Kazuhiro Yamamoto

    QUP workshop: toward Project Q, KEK  2022.11 

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    Event date: 2022.11

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  • Testing quantumness of gravity and modeling optomechanics with suspended mirror

    Extreme Universe, Kick-off meeting for publicly offered research  2022.11 

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    Event date: 2022.10 - 2022.11

    Language:Japanese   Presentation type:Oral presentation (general)  

    Country:Japan  

  • Leggett-Garg inequality for testing quantumness of gravity

    Kazuhiro Yammoto

    YITP-ExU workshop "Quantum extreme universe from quantum information"  2022.9 

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    Event date: 2022.9

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

  • 重力の量子性 - 調和振動子の重力量子もつれ -

    山本一博

    2022.5 

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    Event date: 2022.5

    Language:Japanese  

    Venue:online   Country:Japan  

  • 重力相互作用するハイブリッド系におけるレゲット-ガーグ不等式の破れ

    @松村央, 南部保貞A, @山本一博

    日本物理学会  2022.3 

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    Event date: 2022.3 - 2022.6

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:オンライン   Country:Japan  

  • Testing Newtonian Entanglement Invited

    Kazuhiro Yamamoto

    KEK IPNS-IMSS-QUP Joint workshop  2022.2 

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    Event date: 2022.2

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

    Other Link: https://www-conf.kek.jp/joint-colloquium/

  • 重力の量子性の検証について

    山本一博

    巨視的量子現象と量子重力  2021.10 

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    Event date: 2021.10

    Language:Japanese  

    Venue:京都大学基礎物理学研究所(京都)   Country:Japan  

  • 2019 年ノーベル物理学賞解説セミナー「James Peeblesの解説」 Invited

    山本一博

    2019.12 

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    Event date: 2019.12

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:九州大学   Country:Japan  

    ビッグバン宇宙は、1964 年にペンジアスとウィルソンによって宇宙マイクロ波背景放射が発見されてか ら本格的な研究が始まりました。ジェームズ・ピーブルズは、その前後から宇宙の物理的進化の研究を 一貫して進め、現代宇宙論の理論的枠組みの確立に大きな貢献をしました。特に、宇宙マイクロ波背景 放射と銀河形成の関係の重要性を 1965 年の論文で述べており、物理的宇宙論の始まりと評されていま す。膨張宇宙における密度揺らぎの成長や相関関数を用いた銀河分布の統計的記述の理論的定式化を確 立し、また早くから暗黒物質や宇宙項の重要性も指摘しています。ピーブルズの研究業績は、単著論文 として発表されている先駆的な論文が多く、現代の宇宙論はピーブルズの研究の延長線上に発展してき たと言っても良いかもしれません。本講演では、この物理的宇宙論の発展と今後の展望について解説し ます。

  • Fluctuation-dissipation and correlation-propagation relations in (1+3)D moving detector- quantum field systems International conference

    Kazuhiro Yamamoto, B. L. Hu, J. T. Husiang, S.Y. Lin

    The 29th Workshop on General Relativity and Gravitation in Japan  2019.11 

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    Event date: 2019.11 - 2020.11

    Language:English  

    Country:Japan  

  • 曲がった時空上の場の量子論と一般化された揺動散逸関係

    山本一博

    量子情報と宇宙  2019.9 

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    Event date: 2019.9

    Language:Japanese   Presentation type:Oral presentation (general)  

    Venue:名古屋大学   Country:Japan  

  • Vacuum state as entangled state between left, right, future and past International conference

    Kazuhiro Yamamoto

    Quantum Entanglement in Cosmology  2019.5 

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    Event date: 2019.5

    Language:English   Presentation type:Oral presentation (general)  

    Country:Japan  

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MISC

  • 銀河分布の精密測定による加速膨張宇宙模型の制限 --バリオン-光子流体の音響振動で探る宇宙膨張の歴史 Reviewed

    山本一博

    日本物理学会誌   2008.5

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    Language:Japanese  

    現在,観測的宇宙論の分野で標準模型といえば,宇宙項を導入した模型である.この宇宙項の起源は何かという問題は多くの研究者をひきつけている.宇宙項に似た役割をするダイナミカルな自由度を導入した理論模型が数多く提案され,一般にダークエネルギーと呼ばれる.また,重力理論の修正から観測を説明する試みも考えられている.大きな流れとして,精密な宇宙論的観測からダークエネルギーの性質を制限し,その起源を探るための研究が進められている.その中でも,バリオン音響振動(Baryon Acoustic Oscillation)を用いた方法に焦点をあてて最近の研究を紹介する.

Professional Memberships

  • The Astronomical Society of Japan

  • The Physical Society of Japan

  • International society of relativistic quantum information

Academic Activities

  • 主催 International contribution

    ( 九州大学伊都キャンパス ) 2023.5

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    Type:Competition, symposium, etc. 

    Number of participants:25

  • 世話人

    巨視的量子現象と量子重力  ( 京都大学 基礎物理学研究所 パナソニック国際交流ホール ) 2021.10

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    Type:Competition, symposium, etc. 

    Number of participants:50

  • 世話人

    重力と量子に関する九大名大ジョイントミニワークショップ2021  ( 九州大学理学研究院 ) 2021.10

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    Type:Competition, symposium, etc. 

    Number of participants:10

  • Screening of academic papers

    Role(s): Peer review

    2021

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    Type:Peer review 

    Number of peer-reviewed articles in foreign language journals:1

  • 組織委員 International contribution

    ( 神戸大学 ) 2019.11

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    Type:Competition, symposium, etc. 

    Number of participants:240

  • Screening of academic papers

    Role(s): Peer review

    2019

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    Type:Peer review 

    Number of peer-reviewed articles in foreign language journals:2

  • 実行委員長 International contribution

    ( 東広島市 ) 2017.11 - 2017.12

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    Type:Competition, symposium, etc. 

    Number of participants:184

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Research Projects

  • 時間的相関と量子もつれから解明する重力の量子性の理論的研究

    Grant number:23H01175  2023 - 2026

    日本学術振興会  科学研究費助成事業  基盤研究(B)

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    Authorship:Principal investigator  Grant type:Scientific research funding

  • 重力の量子性の検証に向けた懸架型光学機械振動子の精密理論模型の構築

    Grant number:22H05263  2022 - 2023

    日本学術振興会・文部科学省  科学研究費助成事業  学術変革領域研究(A)

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    Authorship:Principal investigator  Grant type:Scientific research funding

  • 量子を機軸として重力と宇宙、素粒子・原子核研究を繋ぐ新しい学際領域の開拓

    2020 - 2024

    大学改革活性化制度

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    Authorship:Principal investigator  Grant type:On-campus funds, funds, etc.

  • 量子場の非局所相関に起源をもつ量子放射の研究

    Grant number:17K05444  2017 - 2020

    日本学術振興会  科学研究費助成事業  基盤研究(C)

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    Authorship:Principal investigator  Grant type:Scientific research funding

  • 宇宙大規模構造の2点・3点統計量にもとづく精密宇宙論データ解析法の開発と応用

    Grant number:16H03977  2016 - 2019

    日本学術振興会  科学研究費助成事業  基盤研究(B)

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    Authorship:Coinvestigator(s)  Grant type:Scientific research funding

  • 究極理論からの加速宇宙の解明

    Grant number:15H05895  2015 - 2019

    日本学術振興会・文部科学省  科学研究費助成事業  新学術領域研究

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    Authorship:Coinvestigator(s)  Grant type:Scientific research funding

  • 宇宙論的非線形・非摂動重力現象の研究

    Grant number:21244033  2009 - 2014

    日本学術振興会  科学研究費助成事業  基盤研究(B)

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    Grant type:Scientific research funding

  • 次世代ダークエネルギー探査を用いた宇宙論スケールの重力理論の検証

    Grant number:21540270  2009 - 2013

    日本学術振興会  科学研究費助成事業  基盤研究(C)

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    Authorship:Principal investigator  Grant type:Scientific research funding

  • 大規模構造を用いた重力模型のテスト

    Grant number:19035007  2007

    科学研究費助成事業  特定領域研究

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    Authorship:Principal investigator  Grant type:Scientific research funding

  • 次世代大規模銀河赤方偏移探査による暗黒エネルギー検証に向けた理論的研究

    Grant number:18540277  2006 - 2008

    日本学術振興会  科学研究費助成事業  基盤研究(C)

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    Authorship:Principal investigator  Grant type:Scientific research funding

  • 高強度電磁場中の巨視的真空の幾何学的性質

    Grant number:18654047  2006 - 2007

    日本学術振興会  科学研究費助成事業  基盤研究(B)

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    Grant type:Scientific research funding

  • 公開データを用いた宇宙の暗黒成分の研究

    Grant number:15740155  2003 - 2005

    科学研究費助成事業  若手研究(B)

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    Authorship:Principal investigator  Grant type:Scientific research funding

  • 高赤方偏移宇宙における構造形成と暗黒成分に関する研究

    Grant number:13740156  2001 - 2002

    日本学術振興会  科学研究費助成事業  奨励研究

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    Authorship:Principal investigator  Grant type:Scientific research funding

  • 超対称複合模型と宇宙初期状態

    Grant number:11640280  1999 - 2001

    日本学術振興会  科学研究費助成事業  基盤研究(B)

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    Grant type:Scientific research funding

  • 高赤方偏移宇宙における物質の非一様性の進化と宇宙背景放射の研究

    1999

    科学研究費助成事業  稲盛財団研究助成金

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    Authorship:Principal investigator  Grant type:Competitive funding other than Grants-in-Aid for Scientific Research

  • 宇宙背景放射による宇宙進化の研究

    Grant number:09740203  1997 - 1998

    科学研究費助成事業  奨励研究(A)

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    Authorship:Principal investigator  Grant type:Scientific research funding

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Educational Activities

  • Education on quantum mechanics I, quantum mechanics II, general relativity, and general physics

Class subject

  • 物理学特別講義IIB

    2024.10 - 2025.3   Second semester

  • 量子力学I・同演習

    2024.10 - 2025.3   Second semester

  • 物理学特別講義IIB

    2024.10 - 2025.3   Second semester

  • 物理学特別研究IA

    2024.4 - 2024.9   First semester

  • 量子力学II

    2024.4 - 2024.9   First semester

  • 一般相対性理論

    2024.4 - 2024.9   First semester

  • 物理学特別研究IB

    2024.4 - 2024.9   First semester

  • 物理学特別講義IIB

    2023.10 - 2024.3   Second semester

  • 量子力学I・同演習

    2023.10 - 2024.3   Second semester

  • 物理学特別研究IIA

    2023.10 - 2024.3   Second semester

  • 物理学特別研究IB

    2023.4 - 2023.9   First semester

  • 九州大学で学ぶ宇宙科学と技術A

    2023.4 - 2023.9   First semester

  • 一般相対性理論

    2023.4 - 2023.9   First semester

  • 量子力学II

    2023.4 - 2023.9   First semester

  • 物理学特別研究IA

    2023.4 - 2023.9   First semester

  • 量子力学I・同演習

    2022.10 - 2023.3   Second semester

  • 九州大学で学ぶ宇宙科学と技術A

    2022.4 - 2022.9   First semester

  • 電磁気学2

    2022.4 - 2022.9   First semester

  • 一般相対性理論

    2022.4 - 2022.9   First semester

  • 量子力学I・同演習

    2021.10 - 2022.3   Second semester

  • 電磁気学2

    2021.4 - 2021.9   First semester

  • 九州大学で学ぶ宇宙科学と技術A

    2021.4 - 2021.9   First semester

  • 一般相対性理論

    2021.4 - 2021.9   First semester

  • 基幹物理学ⅠB

    2020.10 - 2021.3   Second semester

  • 物理学ゼミナール

    2020.10 - 2021.3   Second semester

  • 宇宙物理学

    2020.10 - 2021.3   Second semester

  • 物理学特別講義12

    2020.4 - 2020.9   First semester

  • 最先端物理学

    2020.4 - 2020.9   First semester

  • 九州大学で学ぶ宇宙科学と技術B

    2020.4 - 2020.9   First semester

  • 一般相対性理論

    2020.4 - 2020.9   First semester

  • 基幹物理学ⅠB

    2019.10 - 2020.3   Second semester

  • 物理学入門II

    2019.10 - 2020.3   Second semester

  • 宇宙物理学

    2019.10 - 2020.3   Second semester

  • 身の回りの物理学B

    2019.6 - 2019.8   Summer quarter

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FD Participation

  • 2024.2   Role:Planning   Title:【物理学科FD】大学院の魅力創造に向けて

    Organizer:Undergraduate school department

  • 2023.3   Role:Planning   Title:【物理学科FD】物理数学の教育と効果的な演習に向けて

    Organizer:Undergraduate school department

  • 2021.3   Role:Participation   Title:【物理学FD】ハイブリッド講義の実践例と講義活性化

    Organizer:[Undergraduate school/graduate school/graduate faculty]

  • 2020.9   Role:Participation   Title:M2B学習支援システム講習会(オンライン開催)◇初級編・中級編◇10:00~12:00

    Organizer:University-wide

  • 2019.7   Role:Participation   Title:3ポリシーに関する全学FD ~日本学術会議分野別参照基準に基づく理学部物理学科の3ポリシー~

    Organizer:University-wide

Social Activities

  • 福岡労災保険指定病院協会学術講演会 (市医共催) 「相対論と宇宙論~宇宙の始まりと進化、そしてブラックホールをめぐる話~」

    福岡労災保険指定病院協会  天神スカイホール  2019.9

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    Audience: General, Scientific, Company, Civic organization, Governmental agency

    Type:Lecture

  • 宇宙を学べる大学in九州 2019参加、九州大学における宇宙物理、天文に関する研究紹介

    佐賀県立宇宙科学館  2019.6

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    Audience: General, Scientific, Company, Civic organization, Governmental agency

    Type:Seminar, workshop

Acceptance of Foreign Researchers, etc.

  • Indonesia University

    Acceptance period: 2024.1   (Period):Less than 2 weeks

    Nationality:Indonesia

  • Indonesia University

    Acceptance period: 2023.5   (Period):Less than 2 weeks

    Nationality:Taiwan, Province of China

  • Maryland Universiy

    Acceptance period: 2023.5   (Period):Less than 2 weeks

    Nationality:United States

    Business entity:Japan Society for the Promotion of Science

  • 広島大学大学院理学研究院

    Acceptance period: 2021.10 - 2022.3   (Period):1 month or more

    Nationality:Indonesia

  • 広島大学大学院理学研究科

    Acceptance period: 2021.6 - 2021.4   (Period):2weeks to less than 1 month

    Nationality:China

    Business entity:Japan Society for the Promotion of Science

  • 広島大学大学院理学研究科

    Acceptance period: 2021.4 - 2021.5   (Period):1 month or more

    Nationality:Indonesia

    Business entity:On-campus funds

  • 広島大学大学院理学研究科

    Acceptance period: 2020.12 - 2021.1  

    Nationality:Indonesia

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Travel Abroad

  • 2001.11 - 2002.8

    Staying countory name 1:Germany   Staying institution name 1:マックスプランク天体物理研究所