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Next-generation relativistic cosmology in the era of precision observations

Research Project

Project/Area Number 19H01891
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 15010:Theoretical studies related to particle-, nuclear-, cosmic ray and astro-physics
Research InstitutionKyoto University

Principal Investigator

Naruko Atsushi  京都大学, 基礎物理学研究所, 特定助教 (80749507)

Co-Investigator(Kenkyū-buntansha) 山内 大介  神奈川大学, 工学部, 助教 (10624645)
齊藤 遼  山口大学, 大学院創成科学研究科, 講師 (70781392)
Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥17,290,000 (Direct Cost: ¥13,300,000、Indirect Cost: ¥3,990,000)
Fiscal Year 2021: ¥5,330,000 (Direct Cost: ¥4,100,000、Indirect Cost: ¥1,230,000)
Fiscal Year 2020: ¥5,330,000 (Direct Cost: ¥4,100,000、Indirect Cost: ¥1,230,000)
Fiscal Year 2019: ¥6,630,000 (Direct Cost: ¥5,100,000、Indirect Cost: ¥1,530,000)
Keywords相対論的宇宙論 / 宇宙マイクロ波背景放射 / 宇宙大規模構造 / 重力波
Outline of Research at the Start

本研究課題では、宇宙のインフレーションなど宇宙初期に作られる原始ゆらぎの生成・発展過程から、宇宙マイクロ波背景放射・宇宙大規模構造・重力波という宇宙論における 3 つの主要な観測量に至るまでを、非線形レベルで記述する次世代の宇宙論の構築・整備を目指す。特に、それぞれの観測量に現れる「ゆらぎの非線形性」を明らかにし、宇宙に関してどのような新しい情報が抜き出せるかを明らかにするだけでなく、3 つの観測量を組み合わせることによって情報を補ったり、整合性条件と呼ばれる観測量の間の関係式なども用いることにより、次世代宇宙論において究極的にどこまで宇宙の真の姿に迫れるかを明らかにする。

Outline of Final Research Achievements

Cosmological perturbation theory, which deals with fluctuations in the universe, is an essential tool for linking observational data with theoretical predictions. "Nonlinearities of primordial fluctuations" are small but always present, and by correctly analyzing them, we can obtain essentially new and much richer information about the early universe that cannot be obtained by linear perturbation theory.

In this research project, we have studied the nonlinear growth of primordial fluctuations and developed the method to systematically analyze cosmic microwave background radiation and cosmic large scale structures at the non-linear level of perturbations. We have also studied the observability of stochastic gravitational wave background. Through these studies, we have constructed a theoretical framework to treat all process from the generation of fluctuations to their observational impacts at the nonlinear level.

Academic Significance and Societal Importance of the Research Achievements

現在、そして将来的な観測計画を前に、「ゆらぎの非線形性」の解析手法を整備し、その観測可能性や観測量への影響を明らかにすることは、次世代宇宙論の構築にとっては必須の命題である。本研究課題を通じて、ゆらぎの非線形性の解析手法を発見・提示し、さらに一歩踏み込んでそれらの観測可能性まで明らかにすることができ、ゆらぎの非線形性の重要性をはっきりと示した。今後、さらに新しい視点からの解析・観測手法の提案につながると予想される。また研究の中で、非線形・非接道的な解析手法の構築することができ、これらの手法の他分野や他の研究課題への応用的な展開も考えられ、本課題の学術的・社会的意義は大きいと考えている。

Report

(4 results)
  • 2022 Final Research Report ( PDF )
  • 2021 Annual Research Report
  • 2020 Annual Research Report
  • 2019 Annual Research Report
  • Research Products

    (51 results)

All 2023 2022 2021 2020 2019 Other

All Int'l Joint Research (1 results) Journal Article (23 results) (of which Int'l Joint Research: 9 results,  Peer Reviewed: 22 results,  Open Access: 13 results) Presentation (14 results) (of which Int'l Joint Research: 4 results,  Invited: 2 results) Funded Workshop (13 results)

  • [Int'l Joint Research] Heidelberg university(ドイツ)

    • Related Report
      2019 Annual Research Report
  • [Journal Article] Ostrogradsky mode in scalar?tensor theories with higher-order derivative couplings to matter2023

    • Author(s)
      Naruko Atsushi、Saito Ryo、Tanahashi Norihiro、Yamauchi Daisuke
    • Journal Title

      Progress of Theoretical and Experimental Physics

      Volume: 2023 Issue: 5 Pages: 1-21

    • DOI

      10.1093/ptep/ptad049

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] No smooth spacetime in Lorentzian quantum cosmology and trans-Planckian physics2023

    • Author(s)
      Matsui Hiroki、Mukohyama Shinji、Naruko Atsushi
    • Journal Title

      Physical Review D

      Volume: 107 Issue: 4 Pages: 043511-043511

    • DOI

      10.1103/physrevd.107.043511

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Antipodal angular correlations of inflationary stochastic gravitational wave background2023

    • Author(s)
      Wu Zhen-Yuan、Sakai Nobuyuki、Saito Ryo
    • Journal Title

      Physical Review D

      Volume: 107 Issue: 2 Pages: 1-12

    • DOI

      10.1103/physrevd.107.023503

    • Related Report
      2021 Annual Research Report
  • [Journal Article] Skewness consistency relation in large-scale structure and test of gravity theory2023

    • Author(s)
      Daisuke Yamauchi, Shoya Ishimaru, Takahiko Matsubara, Tomo Takahashi
    • Journal Title

      Physical Review D

      Volume: 106 Issue: 4 Pages: 043526-043526

    • DOI

      10.1103/physrevd.107.043526

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Testing the non-circularity of the spacetime around Sagittarius A* with orbiting pulsars2022

    • Author(s)
      Takamori Yohsuke、Naruko Atsushi、Sakurai Yusuke、Takahashi Keitaro、Yamauchi Daisuke、Yoo Chul-Moon
    • Journal Title

      Publications of the Astronomical Society of Japan

      Volume: 未定 Issue: Supplement_1 Pages: S217-S231

    • DOI

      10.1093/pasj/psac003

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] DeWitt boundary condition is consistent in Horava-Lifshitz quantum gravity2022

    • Author(s)
      Matsui Hiroki、Mukohyama Shinji、Naruko Atsushi
    • Journal Title

      Physics Letters B

      Volume: 833 Pages: 137340-137340

    • DOI

      10.1016/j.physletb.2022.137340

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Probing the primordial Universe with 21cm line from cosmic dawn/epoch of reionization2022

    • Author(s)
      Minoda Teppei、Saga Shohei、Takahashi Tomo、Tashiro Hiroyuki、Yamauchi Daisuke、Yokoyama Shuichiro、Yoshiura Shintaro
    • Journal Title

      Publications of the Astronomical Society of Japan

      Volume: 75 Issue: Supplement_1 Pages: S154-S180

    • DOI

      10.1093/pasj/psac015

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Second-order peculiar velocity field as a novel probe of scalar-tensor theories2022

    • Author(s)
      Yamauchi Daisuke、Sugiyama Naonori S.
    • Journal Title

      Physical Review D

      Volume: 105 Issue: 6 Pages: 1-16

    • DOI

      10.1103/physrevd.105.063515

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Generalized local ansatz for scale-dependent primordial non-Gaussianities and future galaxy surveys2021

    • Author(s)
      Yamauchi Daisuke、Yokoyama Shuichiro、Takahashi Tomo
    • Journal Title

      Publications of the Astronomical Society of Japan

      Volume: 108 Issue: Supplement_1 Pages: 1-1

    • DOI

      10.1093/pasj/psab108

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] On Lorentz-invariant bispin-2 theories2021

    • Author(s)
      Kimura Rampei、Naruko Atsushi、Yamauchi Daisuke
    • Journal Title

      Physical Review D

      Volume: 104 Issue: 4 Pages: 1-20

    • DOI

      10.1103/physrevd.104.044021

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Unified approach to secondary effects on the CMB B-mode polarization2021

    • Author(s)
      Namikawa Toshiya、Naruko Atsushi、Saito Ryo、Taruya Atsushi、Yamauchi Daisuke
    • Journal Title

      Journal of Cosmology and Astroparticle Physics

      Volume: 2021 Issue: 10 Pages: 029-029

    • DOI

      10.1088/1475-7516/2021/10/029

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Axion cloud decay due to the axion-photon conversion with background magnetic fields2021

    • Author(s)
      Yoo Chul-Moon、Naruko Atsushi、Sakurai Yusuke、Takahashi Keitaro、Takamori Yohsuke、Yamauchi Daisuke
    • Journal Title

      Publications of the Astronomical Society of Japan

      Volume: 74 Issue: 1 Pages: 64-72

    • DOI

      10.1093/pasj/psab110

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Backreaction of mass and angular momentum accretion on black holes: General formulation of metric perturbations and application to the Blandford-Znajek process2021

    • Author(s)
      Kimura Masashi、Harada Tomohiro、Naruko Atsushi、Toma Kenji
    • Journal Title

      Progress of Theoretical and Experimental Physics

      Volume: 2021 Issue: 9 Pages: 1-26

    • DOI

      10.1093/ptep/ptab101

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Dynamical analysis of screening in scalar-tensor theory2021

    • Author(s)
      Nakamura Tomohiro、Ikeda Taishi、Saito Ryo、Tanahashi Norihiro、Yoo Chul-Moon
    • Journal Title

      Physical Review D

      Volume: 103 Issue: 2 Pages: 1-19

    • DOI

      10.1103/physrevd.103.024009

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Possible resolution of a spacetime singularity with field transformations2020

    • Author(s)
      Atsushi Naruko, Chul-Moon Yoo, Misao Sasaki
    • Journal Title

      Progress of Theoretical and Experimental Physics

      Volume: 2020 Issue: 4 Pages: 1-8

    • DOI

      10.1093/ptep/ptaa028

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] On metric transformations with a U(1) gauge field2020

    • Author(s)
      De Felice Antonio、Naruko Atsushi
    • Journal Title

      Physical Review D

      Volume: 101 Issue: 8 Pages: 1-6

    • DOI

      10.1103/physrevd.101.084044

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Could the black hole singularity be a field singularity?2020

    • Author(s)
      Guillem Domenech, Atsushi Naruko, Misao Sasaki and Christof Wetterich
    • Journal Title

      IJMPD

      Volume: 29 Issue: 03 Pages: 2050026-2050026

    • DOI

      10.1142/s0218271820500261

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Testing gravity theories with cosmic microwave background in the degenerate higher-order scalar-tensor theory2020

    • Author(s)
      Hiramatsu Takashi、Yamauchi Daisuke
    • Journal Title

      Physical Review D

      Volume: 102 Issue: 8 Pages: 083525-083525

    • DOI

      10.1103/physrevd.102.083525

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] UV sensitive one-loop matter power spectrum in degenerate higher-order scalar-tensor theories2020

    • Author(s)
      Hirano Shin’ichi、Kobayashi Tsutomu、Yamauchi Daisuke、Yokoyama Shuichiro
    • Journal Title

      Physical Review D

      Volume: 102 Issue: 10 Pages: 1-15

    • DOI

      10.1103/physrevd.102.103505

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Is the trans-Planckian censorship a swampland conjecture?2020

    • Author(s)
      Saito Ryo、Shirai Satoshi、Yamazaki Masahito
    • Journal Title

      Physical Review D

      Volume: 101 Issue: 4 Pages: 046022-046022

    • DOI

      10.1103/physrevd.101.046022

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Local-gravity test of unified models of inflation and dark energy in f(R) gravity2020

    • Author(s)
      Yashiki Mai、Sakai Nobuyuki、Saito Ryo
    • Journal Title

      Physical Review D

      Volume: 102 Issue: 4 Pages: 043504-043504

    • DOI

      10.1103/physrevd.102.043504

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] CMB Constraints on Stochastic Gravitational-Wave Background at Mpc scales2019

    • Author(s)
      Toshiya Namikawa, Shohei Saga, Daisuke Yamauchi, Atsushi Taruya
    • Journal Title

      Physical Review D

      Volume: 100 Issue: 2 Pages: 021303-021303

    • DOI

      10.1103/physrevd.100.021303

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Redshift space distortions in the presence of non-minimally coupled dark matter2019

    • Author(s)
      Fabio Chibana, Rampei Kimura, Masahide Yamaguchi, Daisuke Yamauchi, Shuichiro Yokoyama
    • Journal Title

      Journal of Cosmology and Astroparticle Physics

      Volume: 10 Issue: 10 Pages: 045-045

    • DOI

      10.1088/1475-7516/2019/10/049

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] Multi-messenger Study of Heavy Dark Matter: A02 Group Status Report2023

    • Author(s)
      成子 篤
    • Organizer
      FY2022 "What is dark matter? - Comprehensive study of the huge discovery space in dark matter"
    • Related Report
      2021 Annual Research Report
  • [Presentation] Spatial gradient expansion approach for generic scalar-tensor theories2023

    • Author(s)
      成子 篤
    • Organizer
      Domestic Molecule-type Workshop "Non-linear Nature of Cosmological Perturbations and its Observational Consequences"
    • Related Report
      2021 Annual Research Report
  • [Presentation] Spatial gradient expansion approach for generic scalar-tensor theories2022

    • Author(s)
      成子 篤
    • Organizer
      International Workshop "Dawn of Gravitational-wave Cosmology and Theory of Gravity"
    • Related Report
      2021 Annual Research Report
  • [Presentation] Spatial gradient expansion approach for generic scalar-tensor theories2022

    • Author(s)
      成子 篤
    • Organizer
      Workshop on Gravitation & Cosmology
    • Related Report
      2021 Annual Research Report
  • [Presentation] VHDM search & gravity sector2021

    • Author(s)
      成子 篤
    • Organizer
      1st workshop: Multimessenger Study of Heavy Dark Matter
    • Related Report
      2020 Annual Research Report
  • [Presentation] 一般的なスカラー・テンソル理論における勾配展開法2021

    • Author(s)
      成子 篤
    • Organizer
      日本物理学会 2021年秋季大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] Axion Cloud Decay due to the Axion-photon Conversion with Background Magnetic Fields2021

    • Author(s)
      成子 篤
    • Organizer
      8th Korea-Japan workshop on Dark Energy
    • Related Report
      2020 Annual Research Report
  • [Presentation] Axion Cloud Decay due to the Axion-photon Conversion with Background Magnetic Fields2021

    • Author(s)
      成子 篤
    • Organizer
      第10回観測的宇宙論ワークショップ
    • Related Report
      2020 Annual Research Report
  • [Presentation] Axion Cloud Decay due to the Axion-photon Conversion with Background Magnetic Fields2021

    • Author(s)
      成子 篤
    • Organizer
      The 30th Workshop on General Relativity and Gravitation in Japan
    • Related Report
      2020 Annual Research Report
  • [Presentation] Possible resolution of a spacetime singularity with field transformations2019

    • Author(s)
      成子 篤
    • Organizer
      The third NRF-JSPS workshop in particle physics, cosmology and gravitation
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Possible resolution of a spacetime singularity with field transformations2019

    • Author(s)
      成子 篤
    • Organizer
      Beyond General Relativity, Beyond Cosmological Standard Model
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 宇宙の特異点の取り扱いに関する一つの提案2019

    • Author(s)
      成子 篤
    • Organizer
      日本物理学会 2019 秋季大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] On metric transformations with a U(1) gauge field2019

    • Author(s)
      成子 篤
    • Organizer
      The 29th Workshop on General Relativity and Gravitation in Japan
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Metric transformation and its applications to cosmology2019

    • Author(s)
      成子 篤
    • Organizer
      6th Korea-Japan workshop on dark energy at KMI
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Funded Workshop] International Workshop "Dawn of Gravitational-wave Cosmology and Theory of Gravity"2023

    • Related Report
      2021 Annual Research Report
  • [Funded Workshop] Domestic Molecule-type Workshop "Non-linear Nature of Cosmological Perturbations and its Observational Consequences"2023

    • Related Report
      2021 Annual Research Report
  • [Funded Workshop] International Workshop "Dawn of Gravitational-wave Cosmology and Theory of Gravity"2022

    • Related Report
      2021 Annual Research Report
  • [Funded Workshop] Upcoming CMB Observations & Cosmology2022

    • Related Report
      2021 Annual Research Report
  • [Funded Workshop] 2nd workshop: Multimessenger Study of Heavy Dark Matter2022

    • Related Report
      2021 Annual Research Report
  • [Funded Workshop] Workshop on Gravitation & Cosmology2022

    • Related Report
      2021 Annual Research Report
  • [Funded Workshop] Recent Progress of Quantum Cosmology2021

    • Related Report
      2020 Annual Research Report
  • [Funded Workshop] 第10回観測的宇宙論ワークショップ2021

    • Related Report
      2020 Annual Research Report
  • [Funded Workshop] Galaxy shape statistics and Cosmology2021

    • Related Report
      2020 Annual Research Report
  • [Funded Workshop] Brain-storming workshop on Primordial Black Holes and Gravitational Waves2021

    • Related Report
      2019 Annual Research Report
  • [Funded Workshop] Pulsars, black holes and the theory of gravity2021

    • Related Report
      2019 Annual Research Report
  • [Funded Workshop] 1st workshop: Multimessenger Study of Heavy Dark Matter2021

    • Related Report
      2019 Annual Research Report
  • [Funded Workshop] Theoretical aspects of non-Gaussianity from modern perspectives2019

    • Related Report
      2019 Annual Research Report

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Published: 2019-04-18   Modified: 2024-01-30  

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