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The analysis of a strongly coupled field in curved spacetime within the AdS/CFT duality

Research Project

Project/Area Number 20K03975
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 15010:Theoretical studies related to particle-, nuclear-, cosmic ray and astro-physics
Research InstitutionShibaura Institute of Technology

Principal Investigator

MAEDA Kengo  芝浦工業大学, 工学部, 教授 (10390478)

Co-Investigator(Kenkyū-buntansha) 石橋 明浩  近畿大学, 理工学部, 教授 (10469877)
飯塚 則裕  大阪大学, 大学院理学研究科, 助教 (40645462)
Project Period (FY) 2020-04-01 – 2025-03-31
Project Status Completed (Fiscal Year 2024)
Budget Amount *help
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2022: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2021: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2020: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
KeywordsAdS/CFT双対性 / 半古典方程式 / 光的エネルギー条件 / 時空の量子的不安定性 / ホログラフィック理論 / コーシーホライズン / AdS/CFT対応 / ブラックホール / 半古典近似 / アトラクター機構 / 極大対称ブラックホール / 半古典近似解 / 強結合な場の理論 / エンタングルメントエントロピー / AdS/CFT / 場の量子論 / エネルギー条件
Outline of Research at the Start

流体や電磁場などの通常の古典的物質場では、エネルギーは非負の性質を持つ。この性質は曲がった時空での重力理論を解析する上で基礎となる性質である。一方、量子場を考慮すると、常にエネルギーは非負にならず、局所的に破れえる。「平均化されたエネルギー条件」は、例え局所的に破れても大域的には保たれることを主張しているが、一般の曲がった時空でどの程度保たれているのかは良くわかっていない。本研究では、曲がった時空での「平均化されたエネルギー条件」やエンタングルメントエントロピーの基礎的性質を強結合な場の理論が重力理論と双対であることを主張するAdS/CFT双対性を用いて、重力理論から解明する。

Outline of Final Research Achievements

In this study, we investigated the general properties of strongly coupled fields in various curved spacetimes using the AdS-CFT duality,in order to uncover the nature of quantum effects of matter fields in curved backgrounds.In the first half of the research period, we focused on the averaged null energy, which is invariant under conformal transformations, and demonstrated that it remains non-negative even in evaporating black hole spacetimes.
In the latter half, we developed a method to solve the semiclassical Einstein equations incorporating quantum effects of strongly coupled matter fields in the framework of AdS-CFT duality. In particular, we constructed exact solutions in highly symmetric spacetimes and showed that certain three-dimensional anti-de Sitter (AdS) spacetimes with a negative cosmological constant, as well as low-dimensional black hole solutions, become unstable under quantum perturbations of matter fields

Academic Significance and Societal Importance of the Research Achievements

曲がった時空における場の量子論は、それ自身解析が非常に困難であり、量子効果も含めた時空の解析は非常に限られてきた。一般相対論における金字塔である時空の特異点定理やブラックホールのトポロジー定理では、その証明に光的エネルギー条件を課しているが、これが量子効果も含めて満たされる保証はない。本研究では、AdS/CFT双対性を用いて、強結合の場の量子論に着目し、平均化された光的エネルギーが負になりえないことを示した意義は大きい。一方、量子効果を半古典的に取り入れた半古典アインシュタイン方程式の厳密解はほとんど見つかっていなかったが、本研究において初めて3次元時空の不安定性を示す厳密解が見つかった。

Report

(6 results)
  • 2024 Annual Research Report   Final Research Report ( PDF )
  • 2023 Research-status Report
  • 2022 Research-status Report
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (14 results)

All 2025 2024 2023 2022 2021 2020

All Journal Article (10 results) (of which Peer Reviewed: 10 results,  Open Access: 6 results) Presentation (4 results) (of which Int'l Joint Research: 4 results,  Invited: 1 results)

  • [Journal Article] Semiclassical rotating AdS black holes with quantum hair in holography2025

    • Author(s)
      Hamaki Ryusei、Maeda Kengo
    • Journal Title

      Physical Review D

      Volume: 111 Issue: 8

    • DOI

      10.1103/physrevd.111.084021

    • Related Report
      2024 Annual Research Report
    • Peer Reviewed
  • [Journal Article] The higher dimensional instabilities of AdS in holographic semiclassical gravity2025

    • Author(s)
      Ishibashi Akihiro、Maeda Kengo、Okamura Takashi
    • Journal Title

      Journal of High Energy Physics

      Volume: 2025 Issue: 4 Pages: 1-27

    • DOI

      10.1007/jhep04(2025)167

    • Related Report
      2024 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Cutoff scale of quadratic gravity from quantum focusing conjecture2024

    • Author(s)
      Kanai Takamasa、Maeda Kengo、Noumi Toshifumi、Yoshida Daisuke
    • Journal Title

      Physical Review D

      Volume: 110 Issue: 8 Pages: 084037-084037

    • DOI

      10.1103/physrevd.110.084037

    • Related Report
      2024 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Symmetry breaking of 3-dimensional AdS in holographic semiclassical gravity2024

    • Author(s)
      Ishibashi Akihiro、Maeda Kengo、Okamura Takashi
    • Journal Title

      Journal of High Energy Physics

      Volume: 2024 Issue: 2

    • DOI

      10.1007/jhep02(2024)146

    • Related Report
      2023 Research-status Report
    • Peer Reviewed
  • [Journal Article] Flows of rotating extremal attractor black holes2023

    • Author(s)
      Iizuka Norihiro、Ishibashi Akihiro、Maeda Kengo
    • Journal Title

      Journal of High Energy Physics

      Volume: 2023 Issue: 8 Pages: 177-177

    • DOI

      10.1007/jhep08(2023)177

    • Related Report
      2023 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Semiclassical Einstein equations from holography and boundary dynamics2023

    • Author(s)
      石橋明浩、前田健吾、岡村隆
    • Journal Title

      Journal of High Energy Physics

      Volume: 2023

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Flows of Extremal Attractor Black Holes2022

    • Author(s)
      飯塚則裕、石橋明浩、前田健吾
    • Journal Title

      Journal of High Energy Physics

      Volume: 2022

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] The averaged null energy condition on holographic evaporating black holes2022

    • Author(s)
      石橋明浩、前田健吾
    • Journal Title

      Journal of High Energy Physics

      Volume: 2022 Issue: 3 Pages: 104-104

    • DOI

      10.1007/jhep03(2022)104

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] First law of entanglement entropy in AdS black hole backgrounds2021

    • Author(s)
      Ishibashi Akihiro、Maeda Kengo
    • Journal Title

      Physical Review D

      Volume: 104 Issue: 2 Pages: 026004-026004

    • DOI

      10.1103/physrevd.104.026004

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] The averaged null energy conditions in even dimensional curved spacetimes from AdS/CFT duality2020

    • Author(s)
      Norihiro Iizuka, Akihiro Ishibashi and Kengo Maedac
    • Journal Title

      Journal of High Energy Physics

      Volume: 10 Issue: 10 Pages: 106-106

    • DOI

      10.1007/jhep10(2020)106

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Symmetry breaking of 3-dimensional AdSin holographic semiclassical gravity2024

    • Author(s)
      前田健吾
    • Organizer
      Quantum field theory in curved spacetime
    • Related Report
      2024 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Semiclassical Einstein equations from holography and boundary dynamics2023

    • Author(s)
      前田健吾
    • Organizer
      ExU-YITP Workshop on Holography, Gravity and Quantum Information
    • Related Report
      2023 Research-status Report
    • Int'l Joint Research
  • [Presentation] Flows of Extremal Attractor Black Holes2022

    • Author(s)
      前田健吾
    • Organizer
      Fundamental aspects of gravity
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Averaged null energy condition in curved spacetime from AdS/CFT2020

    • Author(s)
      石橋明浩
    • Organizer
      Recent progress in theoretical physics based on quantum information theory
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research / Invited

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Published: 2020-04-28   Modified: 2026-01-16  

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