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Nagao Keiichi  永尾 敬一

… Alternative Names

永尾 敬一  ナガオ ケイイチ

NAGAO Keiichi  永尾 敬一

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Researcher Number 10391731
Other IDs
  • ORCIDhttps://orcid.org/0000-0002-6665-1282
Affiliation (Current) 2025: 茨城大学, 教育学野, 准教授
Affiliation (based on the past Project Information) *help 2021 – 2023: 茨城大学, 教育学部, 准教授
2007 – 2012: Ibaraki University, 教育学部, 准教授
2006: 茨城大学, 教育学部, 助教授
Review Section/Research Field
Principal Investigator
Particle/Nuclear/Cosmic ray/Astro physics / Basic Section 13010:Mathematical physics and fundamental theory of condensed matter physics-related
Keywords
Principal Investigator
量子基礎論 / 素粒子論 / 素粒子(理論) / 宇宙論 / 素粒子諭 / 国際情報交換 デンマーク / 国際研究者交流 デンマーク / 素粒子 / 格子ゲージ理論 / 非可換幾何 / 行列模型 / 超弦理論
  • Research Projects

    (3 results)
  • Research Products

    (40 results)
  •  Complex action theory and the naturalness problem in inflationary cosmologyPrincipal Investigator

    • Principal Investigator
      永尾 敬一
    • Project Period (FY)
      2021 – 2025
    • Research Category
      Grant-in-Aid for Scientific Research (C)
    • Review Section
      Basic Section 13010:Mathematical physics and fundamental theory of condensed matter physics-related
    • Research Institution
      Ibaraki University
  •  Non-perturbative and background-independent formulation of quantum gravity and its general problemsPrincipal Investigator

    • Principal Investigator
      NAGAO Keiichi
    • Project Period (FY)
      2009 – 2012
    • Research Category
      Grant-in-Aid for Young Scientists (B)
    • Research Field
      Particle/Nuclear/Cosmic ray/Astro physics
    • Research Institution
      Ibaraki University
  •  Nonperturbative study of superstring and quantum gravityPrincipal Investigator

    • Principal Investigator
      NAGAO Keiichi
    • Project Period (FY)
      2006 – 2008
    • Research Category
      Grant-in-Aid for Young Scientists (B)
    • Research Field
      Particle/Nuclear/Cosmic ray/Astro physics
    • Research Institution
      Ibaraki University

All 2024 2023 2022 2013 2012 2011 2010 2008 2006

All Journal Article Presentation

  • [Journal Article] Automatic hermiticity for mixed states2023

    • Author(s)
      Keiichi Nagao, Holger Bech Nielsen
    • Journal Title

      Progress of Theoretical and Experimental Physics

      Volume: 2023 Issue: 3

    • DOI

      10.1093/ptep/ptad025

    • Peer Reviewed / Open Access / Int'l Joint Research
    • Data Source
      KAKENHI-PROJECT-21K03381
  • [Journal Article] What gives a “theory of Initial Conditions” ?2022

    • Author(s)
      Keiichi Nagao, Holger Bech Nielsen
    • Journal Title

      Proceedings to Bled Workshops in Physics

      Volume: 23 Pages: 236-247

    • Peer Reviewed / Int'l Joint Research
    • Data Source
      KAKENHI-PROJECT-21K03381
  • [Journal Article] Reality from maximizing overlap in the periodic complex action theory2022

    • Author(s)
      Keiichi Nagao, Holger Bech Nielsen
    • Journal Title

      Progress of Theoretical and Experimental Physics

      Volume: 2022 Issue: 9

    • DOI

      10.1093/ptep/ptac102

    • Peer Reviewed / Open Access / Int'l Joint Research
    • Data Source
      KAKENHI-PROJECT-21K03381
  • [Journal Article] Holger Bech Nielsen, Theory Including Future Not Excluded : Formulation of Complex Action Theory II2013

    • Author(s)
      Keiichi Nagao
    • Journal Title

      Prog. Theor. Exp. Phys.

      Volume: 023B04 Issue: 2 Pages: 1-21

    • DOI

      10.1093/ptep/pts084

    • Peer Reviewed
    • Data Source
      KAKENHI-PROJECT-21740157
  • [Journal Article] Holger Bech Nielsen, Momentum and Hamiltonian in Complex Action Theory2012

    • Author(s)
      Keiichi Nagao
    • Journal Title

      Int. Mod. Phys.

      Volume: 27 Issue: 14 Pages: 12500761-30

    • DOI

      10.1142/s0217751x12500765

    • Peer Reviewed
    • Data Source
      KAKENHI-PROJECT-21740157
  • [Journal Article] Holger Bech Nielsen, Correspondence between future-included and future-not-included theories2012

    • Author(s)
      Keiichi Nagao
    • Journal Title

      Proc.Bled 2012:What Comes Beyond the Standard Models

      Pages: 86-93

    • Peer Reviewed
    • Data Source
      KAKENHI-PROJECT-21740157
  • [Journal Article] Correspondence between future-included and future-not-included theories2012

    • Author(s)
      Keiichi Nagao, Holger Bech Nielsen
    • Journal Title

      Proceedings to the 15 the workshop, What comes Beyond the Standard Models, Bled, July 9-19, 2012

      Volume: 13 Pages: 86-93

    • Peer Reviewed
    • Data Source
      KAKENHI-PROJECT-21740157
  • [Journal Article] Holger Bech Nielsen, Automatic Hermiticity2011

    • Author(s)
      Keiichi Nagao
    • Journal Title

      Prog.Theor.Phys.

      Volume: 125 Issue: 3 Pages: 633-640

    • DOI

      10.1143/ptp.125.633

    • NAID

      110008513374

    • Peer Reviewed
    • Data Source
      KAKENHI-PROJECT-21740157
  • [Journal Article] Automatic Hermiticity2011

    • Author(s)
      Keiichi Nagao, Holger Bech Nielsen
    • Journal Title

      Progress of Theoretical Physics

      Volume: 125 Pages: 633-640

    • NAID

      110008513374

    • Peer Reviewed
    • Data Source
      KAKENHI-PROJECT-21740157
  • [Journal Article] Holger Bech Nielsen, Formulation of Complex Action Theory2011

    • Author(s)
      Keiichi Nagao
    • Journal Title

      Prog. Theor. Phys.

      Volume: 126 Issue: 6 Pages: 1021-1049

    • DOI

      10.1143/ptp.126.1021

    • NAID

      110008897247

    • Peer Reviewed
    • Data Source
      KAKENHI-PROJECT-21740157
  • [Journal Article] Complex Action Functioning as Cutoff and De Broglie-Bohm Particle2010

    • Author(s)
      H.B.Nielsen, N.S.Mankoc Borstnik, K.Nagao and G.Moultaka
    • Journal Title

      Proc.Bled 2010:What Comes Beyond the Standard Models

      Pages: 211-216

    • Peer Reviewed
    • Data Source
      KAKENHI-PROJECT-21740157
  • [Journal Article] Erratum to: "Vortex fermion on the lattice"[Nuclear Physics B636 (2002) 264.290]2008

    • Author(s)
      Keiichi Nagao
    • Journal Title

      Nuclear Physics B800

      Pages: 401-404

    • Peer Reviewed
    • Data Source
      KAKENHI-PROJECT-18740127
  • [Journal Article] Ginsparg-Wilson Relation and Admissibility Condition in Noncommutative Geometry2008

    • Author(s)
      Keiichi Nagao
    • Journal Title

      Progress of Theoretical Physics Supplement 171

      Pages: 232-235

    • NAID

      110006632535

    • Data Source
      KAKENHI-PROJECT-18740127
  • [Journal Article] Ginsparg-Wilson Relation and Admissibility Condition in Nonco mmutative Geometry2008

    • Author(s)
      Keiichi Nagao
    • Journal Title

      Progress of Theoretical Physics Supplement 171

      Pages: 232-235

    • NAID

      110006632535

    • Data Source
      KAKENHI-PROJECT-18740127
  • [Journal Article] Erratum to : "Vortex fermion on the lattice"[Nuclear Physics B636 (2002) 264-290]2008

    • Author(s)
      Keiichi Nagao
    • Journal Title

      Nuclear Physics B 800

      Pages: 401-404

    • Peer Reviewed
    • Data Source
      KAKENHI-PROJECT-18740127
  • [Journal Article] Dynamical aspects of the fuzzy CP2 in the large N reduced model with a cubic term2006

    • Author(s)
      Takehiro Azuma、Subrata Bal、Keiichi Nagao and Jun Nishimura
    • Journal Title

      Journal of High Energy Physics 0605:061

      Pages: 1-27

    • Peer Reviewed
    • Data Source
      KAKENHI-PROJECT-18740127
  • [Journal Article] Dynamical aspects of the fuzzy CP^2 in the large N reduced model with a cubic term2006

    • Author(s)
      東武大, Subrata Bal, 永尾敬一, 西村淳
    • Journal Title

      Journal of High Energy Physics JHEP 0605:061

      Pages: 27-27

    • Data Source
      KAKENHI-PROJECT-18740127
  • [Presentation] Automatic hermiticity for mixed states2024

    • Author(s)
      永尾 敬一、Holger Bech Nielsen
    • Organizer
      日本物理学会2024年春季大会
    • Data Source
      KAKENHI-PROJECT-21K03381
  • [Presentation] Complex action suggests future-included theory2024

    • Author(s)
      永尾 敬一、Holger Bech Nielsen
    • Organizer
      日本物理学会2024年春季大会
    • Data Source
      KAKENHI-PROJECT-21K03381
  • [Presentation] Reality from maximizing overlap in the periodic complex action theory2024

    • Author(s)
      永尾 敬一、Holger Bech Nielsen
    • Organizer
      日本物理学会2024年春季大会
    • Data Source
      KAKENHI-PROJECT-21K03381
  • [Presentation] Reality from maximizing overlap in the periodic complex action theory2022

    • Author(s)
      Keiichi Nagao
    • Organizer
      KEK Theory Workshop 2022
    • Int'l Joint Research
    • Data Source
      KAKENHI-PROJECT-21K03381
  • [Presentation] Theory Including Future Not Excluded2013

    • Author(s)
      Keiichi Nagao
    • Organizer
      KEK理論研究会2013
    • Place of Presentation
      高エネルギー加速器研究機構(KEK)
    • Year and Date
      2013-03-19
    • Data Source
      KAKENHI-PROJECT-21740157
  • [Presentation] Formulation of complex action theory2013

    • Author(s)
      永尾敬一
    • Organizer
      The 15 the workshop, What comes Beyond the Standard Models, Bled, July 9-19, 2012
    • Place of Presentation
      Plemelj's house, Bled, Sloveni
    • Data Source
      KAKENHI-PROJECT-21740157
  • [Presentation] Theory Including Future Not Excluded2013

    • Author(s)
      永尾敬一
    • Organizer
      KEK理論研究会2013
    • Place of Presentation
      高エネルギー加速器研究機構(KEK)
    • Data Source
      KAKENHI-PROJECT-21740157
  • [Presentation] Theory Including Future Not Excluded2012

    • Author(s)
      永尾敬一,Holger Bech Nielsen
    • Organizer
      日本物理学会2012年秋季大会
    • Place of Presentation
      京都産業大学
    • Data Source
      KAKENHI-PROJECT-21740157
  • [Presentation] Formulation of Complex Action Theory2012

    • Author(s)
      Keiichi Nagao
    • Organizer
      QMKEK2012 量子論の諸問題と今後の発展
    • Place of Presentation
      高エネルギー加速器研究機構(KEK)
    • Year and Date
      2012-03-17
    • Data Source
      KAKENHI-PROJECT-21740157
  • [Presentation] Automatic Hermiticity2012

    • Author(s)
      Keiichi Nagao
    • Organizer
      基礎物理学研究所研究会「物理と情報の階層構造-情報を接点とした諸階層の制御と創発-」
    • Place of Presentation
      京都大学基礎物理学研究所
    • Year and Date
      2012-01-07
    • Data Source
      KAKENHI-PROJECT-21740157
  • [Presentation] Formulation of complex action theory2012

    • Author(s)
      Keiichi Nagao
    • Organizer
      Bled 2012: What comes Beyond the Standard Models
    • Place of Presentation
      Plemelj's house, Bled, Slovenia
    • Year and Date
      2012-07-10
    • Data Source
      KAKENHI-PROJECT-21740157
  • [Presentation] Holger Bech Nielsen, Theory Including Future Not Excluded2012

    • Author(s)
      Keiichi Nagao
    • Organizer
      日本物理学会2012年秋季大会
    • Place of Presentation
      京都産業大学
    • Year and Date
      2012-09-11
    • Data Source
      KAKENHI-PROJECT-21740157
  • [Presentation] Formulation of Complex Action Theory2012

    • Author(s)
      Keiichi Nagao
    • Organizer
      KEK理論研究会2012
    • Place of Presentation
      高エネルギー加速器研究機構(KEK)
    • Year and Date
      2012-03-06
    • Data Source
      KAKENHI-PROJECT-21740157
  • [Presentation] Automatic Hermiticity2011

    • Author(s)
      Keiichi Nagao
    • Organizer
      KEK理論研究会2011
    • Place of Presentation
      日の予定であったが震災のため中止(研究会HP上で発表原稿が公開), 高エネルギー加速器研究機構(KEK)
    • Year and Date
      2011-03-15
    • Data Source
      KAKENHI-PROJECT-21740157
  • [Presentation] Automatic Hermiticity2011

    • Author(s)
      Keiichi Nagao
    • Organizer
      KEK理論研究会2011
    • Place of Presentation
      高エネルギー加速器研究機構(会合は中止、発表は成立と見なされた HP上で公開)
    • Year and Date
      2011-03-15
    • Data Source
      KAKENHI-PROJECT-21740157
  • [Presentation] Automatic Hermiticity2011

    • Author(s)
      Keiichi Nagao, Holger Bech Nielsen
    • Organizer
      日本物理学会2011年秋季大会
    • Place of Presentation
      弘前大学
    • Year and Date
      2011-09-18
    • Data Source
      KAKENHI-PROJECT-21740157
  • [Presentation] Automatic Hermiticity2011

    • Author(s)
      Keiichi Nagao
    • Organizer
      NBI Theoretical High Energy Seminar
    • Place of Presentation
      ニールス・ボーア研究所
    • Year and Date
      2011-02-03
    • Data Source
      KAKENHI-PROJECT-21740157
  • [Presentation] Momentum and Hamiltonian in Complex Action Theory2011

    • Author(s)
      Keiichi Nagao, Holger Bech Nielsen
    • Organizer
      日本物理学会2011年秋季大会
    • Place of Presentation
      弘前大学
    • Year and Date
      2011-09-18
    • Data Source
      KAKENHI-PROJECT-21740157
  • [Presentation] Formulation of Complex Action Theory2011

    • Author(s)
      Keiichi Nagao, Holger Bech Nielsen
    • Organizer
      日本物理学会2011年秋季大会
    • Place of Presentation
      弘前大学
    • Year and Date
      2011-09-18
    • Data Source
      KAKENHI-PROJECT-21740157
  • [Presentation] Holger Bech Nielsen, Automatic Hermiticity2011

    • Author(s)
      Keiichi Nagao
    • Organizer
      日本物理学会2011年秋季大会
    • Place of Presentation
      弘前大学
    • Year and Date
      2011-09-18
    • Data Source
      KAKENHI-PROJECT-21740157
  • [Presentation] Holger Bech Nielsen, Formulation of Complex Action Theory2011

    • Author(s)
      Keiichi Nagao
    • Organizer
      日本物理学会2011年秋季大会
    • Place of Presentation
      弘前大学
    • Year and Date
      2011-09-18
    • Data Source
      KAKENHI-PROJECT-21740157
  • [Presentation] Holger Bech Nielsen, Momentum and Hamiltonian in Complex Action Theory2011

    • Author(s)
      Keiichi Nagao
    • Organizer
      日本物理学会2011年秋季大会
    • Place of Presentation
      弘前大学
    • Year and Date
      2011-09-18
    • Data Source
      KAKENHI-PROJECT-21740157
  • [Presentation] Ginsparg-Wilson Relation and Admissibility Condition in Noncommutative Geometry2006

    • Author(s)
      Keiichi Nagao
    • Organizer
      Noncommutative Geometry and Quantum Spacetime in Physics 21st Nishinomiya-Yukawa、Memorial Symposium on Theoretical Physics
    • Place of Presentation
      夙川公民館
    • Year and Date
      2006-11-14
    • Data Source
      KAKENHI-PROJECT-18740127

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