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2017 Fiscal Year Annual Research Report

Multifaceted Study of the Physics of the Inflationary Universe

Planned Research

Project AreaWhy does the Universe accelerate? - Exhaustive study and challenge for the future -
Project/Area Number 15H05888
Research InstitutionKyoto University

Principal Investigator

佐々木 節  京都大学, 基礎物理学研究所, 教授 (70162386)

Co-Investigator(Kenkyū-buntansha) 横山 順一  東京大学, 大学院理学系研究科(理学部), 教授 (50212303)
高橋 智  佐賀大学, 工学(系)研究科(研究院), 准教授 (60432960)
山口 昌英  東京工業大学, 理学院, 教授 (80383511)
Project Period (FY) 2015-06-29 – 2020-03-31
Keywordsインフレーション宇宙 / 宇宙論的量子揺らぎ / 宇宙論的重力波 / 宇宙の再加熱 / 修正重力理論 / 原始ブラックホール / 原始非ガウス揺らぎ
Outline of Annual Research Achievements

H29年度は,様々なクラスのインフレーション宇宙モデルについて,それぞれの性質や予言について,これまでにない新しい知見が得られ,発見があった。以下はその主な成果である。
1.インフレーション宇宙のダイナミックス:インフレーション後の再加熱期におけるヒッグス場の不安定性を解析し,低エネルギーインフレーションの場合でも電弱真空が崩壊する可能性があることを指摘した(中山)。また,将来の重力波観測でブラックホール連星の質量関数を測定することで,インフレーション起源の原始ブラックホール説を明確に検証することができることを示した(須山・横山修)。インフレーション中に有限質量を持つ重力理論における重力波のスペクトルを精密に計算し,それが将来の重力波観測で直接検証できる可能性を示した(佐々木)。
2.観測的検証:カーバトンシナリオにおける物質等曲率ゆらぎの進化を再考し,宇宙マイクロ波背景輻射(CMB)観測から得られるモデルへの制限が従来のものより緩和されることを示した(横山修)。あるクラスの修正重力理論では,重力波と曲率揺らぎの相互作用が,ある特徴的な非ガウス的揺らぎを生成し,それがCMB揺らぎの観測データに示唆されている非ガウス性とよく一致することを示した(佐々木)。また,インフラトンがアインシュタインテンソルと結合している場合にのみにCMB揺らぎのBモード偏光の三点関数に特異な信号が検出されることを示した(横山順)。
3.理論の追求:高階微分理論のより一般的なクラスを発見し,そのクラスのすべての理論で一様等方宇宙が不安定であることを示した(小林)。現在の観測結果を良く再現する多くのインフレーションモデルは「極インフレーション」の枠組みで統一的に理解されることを示し,超重力理論における極インフレーションモデルを解析した(山口)
。

Current Status of Research Progress
Current Status of Research Progress

2: Research has progressed on the whole more than it was originally planned.

Reason

各自,順調に成果をあげており,インフレーション理論に関する知見も着実に増えている。

Strategy for Future Research Activity

これまで通り,メンバー全員が集まり成果を俯瞰し総括する。そして、世界の中での我々の研究の進展状況・位置を明確にし,それに基づいて今後の方向性を議論する。特に究極理論からの理論的動機付けやモデルの観測的検証可能性をより明確にするために,他の計画研究との連携をより強化する。

  • Research Products

    (48 results)

All 2018 2017 Other

All Int'l Joint Research (6 results) Journal Article (28 results) (of which Int'l Joint Research: 13 results,  Peer Reviewed: 28 results,  Open Access: 4 results) Presentation (9 results) (of which Int'l Joint Research: 9 results,  Invited: 9 results) Book (1 results) Remarks (1 results) Funded Workshop (3 results)

  • [Int'l Joint Research] 韓国天文研究院/アジア太平洋理論物理学センター/基礎科学研究所(韓国)

    • Country Name
      KOREA (REP. OF KOREA)
    • Counterpart Institution
      韓国天文研究院/アジア太平洋理論物理学センター/基礎科学研究所
    • # of Other Institutions
      1
  • [Int'l Joint Research] マギル大学(カナダ)

    • Country Name
      CANADA
    • Counterpart Institution
      マギル大学
  • [Int'l Joint Research] ヘルシンキ大学(フィンランド)

    • Country Name
      FINLAND
    • Counterpart Institution
      ヘルシンキ大学
  • [Int'l Joint Research] ワルシャワ大学(ポーランド)

    • Country Name
      POLAND
    • Counterpart Institution
      ワルシャワ大学
  • [Int'l Joint Research] 中国科学院/香港科学技術大学/浙江工業大学(中国)

    • Country Name
      CHINA
    • Counterpart Institution
      中国科学院/香港科学技術大学/浙江工業大学
    • # of Other Institutions
      2
  • [Int'l Joint Research]

    • # of Other Countries
      2
  • [Journal Article] Observational signatures of the parametric amplification of gravitational waves during reheating after inflation2018

    • Author(s)
      Kuroyanagi Sachiko、Lin Chunshan、Sasaki Misao、Tsujikawa Shinji
    • Journal Title

      Physical Review D

      Volume: 97 Pages: 023516

    • DOI

      10.1103/PhysRevD.97.023516

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Strongly coupled quasi-single field inflation2018

    • Author(s)
      Iyer Aditya Varna、Pi Shi、Wang Yi、Wang Ziwei、Zhou Siyi
    • Journal Title

      Journal of Cosmology and Astroparticle Physics

      Volume: 2018 Pages: 041~041

    • DOI

      10.1088/1475-7516/2018/01/041

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Explosive axion production from saxion2018

    • Author(s)
      Ema Yohei、Nakayama Kazunori
    • Journal Title

      Physics Letters B

      Volume: 776 Pages: 174~181

    • DOI

      10.1016/j.physletb.2017.11.035

    • Peer Reviewed
  • [Journal Article] Oscillating scalar fields in extended quintessence2018

    • Author(s)
      Li Dan、Pi Shi、Scherrer Robert J.
    • Journal Title

      Physical Review D

      Volume: 97 Pages: 023530

    • DOI

      10.1103/PhysRevD.97.023530

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Hamiltonian approach to second order gauge invariant cosmological perturbations2018

    • Author(s)
      Domenech Guillem、Sasaki Misao
    • Journal Title

      Physical Review D

      Volume: 97 Pages: 023521

    • DOI

      10.1103/PhysRevD.97.023521

    • Peer Reviewed
  • [Journal Article] Hidden Universality in the Merger Rate Distribution in the Primordial Black Hole Scenario2018

    • Author(s)
      Kocsis Bence、Suyama Teruaki、Tanaka Takahiro、Yokoyama Shuichiro
    • Journal Title

      The Astrophysical Journal

      Volume: 854 Pages: 41~41

    • DOI

      10.3847/1538-4357/aaa7f4

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] 21 cm angular power spectrum from minihalos as a probe of primordial spectral runnings2018

    • Author(s)
      Sekiguchi Toyokazu、Takahashi Tomo、Tashiro Hiroyuki、Yokoyama Shuichiro
    • Journal Title

      Journal of Cosmology and Astroparticle Physics

      Volume: 2018 Pages: 053~053

    • DOI

      10.1088/1475-7516/2018/02/053

    • Peer Reviewed
  • [Journal Article] CMB B-mode auto-bispectrum produced by primordial gravitational waves2018

    • Author(s)
      Tahara Hiroaki W H、Yokoyama Jun’ichi
    • Journal Title

      Progress of Theoretical and Experimental Physics

      Volume: 2018 Pages: 013E03

    • DOI

      10.1093/ptep/ptx185

    • Peer Reviewed / Open Access
  • [Journal Article] Dark matter kinetic decoupling with a light particle2018

    • Author(s)
      Kamada Ayuki、Takahashi Tomo
    • Journal Title

      Journal of Cosmology and Astroparticle Physics

      Volume: 2018 Pages: 047~047

    • DOI

      10.1088/1475-7516/2018/01/047

    • Peer Reviewed
  • [Journal Article] Constraining modified theories of gravity with the galaxy bispectrum2017

    • Author(s)
      Yamauchi Daisuke、Yokoyama Shuichiro、Tashiro Hiroyuki
    • Journal Title

      Physical Review D

      Volume: 96 Pages: 123516

    • DOI

      10.1103/PhysRevD.96.123516

    • Peer Reviewed
  • [Journal Article] Extended mimetic gravity: Hamiltonian analysis and gradient instabilities2017

    • Author(s)
      Takahashi Kazufumi、Kobayashi Tsutomu
    • Journal Title

      Journal of Cosmology and Astroparticle Physics

      Volume: 2017 Pages: 038~038

    • DOI

      10.1088/1475-7516/2017/11/038

    • Peer Reviewed
  • [Journal Article] Refined study of isocurvature fluctuations in the curvaton scenario2017

    • Author(s)
      Kitajima Naoya、Langlois David、Takahashi Tomo、Yokoyama Shuichiro
    • Journal Title

      Journal of Cosmology and Astroparticle Physics

      Volume: 2017 Pages: 042~042

    • DOI

      10.1088/1475-7516/2017/12/042

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] The gravitational waves from the first-order phase transition with a dimension-six operator2017

    • Author(s)
      Cai Rong-Gen、Sasaki Misao、Wang Shao-Jiang
    • Journal Title

      Journal of Cosmology and Astroparticle Physics

      Volume: 2017 Pages: 004~004

    • DOI

      10.1088/1475-7516/2017/08/004

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] CMB spectral distortions in generic two-field models2017

    • Author(s)
      Kainulainen Kimmo、Leskinen Juuso、Nurmi Sami、Takahashi Tomo
    • Journal Title

      Journal of Cosmology and Astroparticle Physics

      Volume: 2017 Pages: 002~002

    • DOI

      10.1088/1475-7516/2017/11/002

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Particle collision with an arbitrarily high center-of-mass energy near a Ba?ados-Teitelboim-Zanelli black hole2017

    • Author(s)
      Tsukamoto Naoki、Ogasawara Kota、Gong Yungui
    • Journal Title

      Physical Review D

      Volume: 96 Pages: 024042

    • DOI

      10.1103/PhysRevD.96.024042

    • Peer Reviewed
  • [Journal Article] Supersymmetry in a dynamical M-brane background2017

    • Author(s)
      Maeda Kengo、Uzawa Kunihito
    • Journal Title

      Physical Review D

      Volume: 96 Pages: 084053

    • DOI

      10.1103/PhysRevD.96.084053

    • Peer Reviewed
  • [Journal Article] Gravitino/axino as decaying dark matter and cosmological tensions2017

    • Author(s)
      Hamaguchi Koichi、Nakayama Kazunori、Tang Yong
    • Journal Title

      Physics Letters B

      Volume: 772 Pages: 415~419

    • DOI

      10.1016/j.physletb.2017.06.071

    • Peer Reviewed
  • [Journal Article] Revisiting the oscillations in the cosmic microwave background angular power spectra at ? ? 120 in the Planck 2015 data2017

    • Author(s)
      Horiguchi Koichiro、Ichiki Kiyotomo、Yokoyama Jun’ichi
    • Journal Title

      Progress of Theoretical and Experimental Physics

      Volume: 2017 Pages: 093E01

    • DOI

      10.1093/ptep/ptx121

    • Peer Reviewed / Open Access
  • [Journal Article] New bound on low reheating temperature for dark matter in models with early matter domination2017

    • Author(s)
      Choi Ki-Young、Takahashi Tomo
    • Journal Title

      Physical Review D

      Volume: 96 Pages: 041301

    • DOI

      10.1103/PhysRevD.96.041301

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Spin distribution of primordial black holes2017

    • Author(s)
      Chiba Takeshi、Yokoyama Shuichiro
    • Journal Title

      Progress of Theoretical and Experimental Physics

      Volume: 2017 Pages: 083E01

    • DOI

      10.1093/ptep/ptx087

    • Peer Reviewed / Open Access
  • [Journal Article] Thermal activation of thin-shells in anti-de Sitter black hole spacetime2017

    • Author(s)
      Chen Pisin、Domenech Guillem、Sasaki Misao、Yeom Dong-han
    • Journal Title

      Journal of High Energy Physics

      Volume: 2017 Pages: 134

    • DOI

      10.1007/JHEP07(2017)134

    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Cosmological perturbations and stability of nonsingular cosmologies with limiting curvature2017

    • Author(s)
      Yoshida Daisuke、Quintin Jerome、Yamaguchi Masahide、Brandenberger Robert H.
    • Journal Title

      Physical Review D

      Volume: 96 Pages: 043502

    • DOI

      10.1103/PhysRevD.96.043502

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Ghost free systems with coexisting bosons and fermions2017

    • Author(s)
      Kimura Rampei、Sakakihara Yuki、Yamaguchi Masahide
    • Journal Title

      Physical Review D

      Volume: 96 Pages: 044015

    • DOI

      10.1103/PhysRevD.96.044015

    • Peer Reviewed
  • [Journal Article] Constraints on long-lived electrically charged massive particles from anomalous strong lens systems2017

    • Author(s)
      Kamada Ayuki、Inoue Kaiki Taro、Kohri Kazunori、Takahashi Tomo
    • Journal Title

      Journal of Cosmology and Astroparticle Physics

      Volume: 2017 Pages: 008~008

    • DOI

      10.1088/1475-7516/2017/11/008

    • Peer Reviewed
  • [Journal Article] Action growth of charged black holes with a single horizon2017

    • Author(s)
      Cai Rong-Gen、Sasaki Misao、Wang Shao-Jiang
    • Journal Title

      Physical Review D

      Volume: 95 Pages: 124002

    • DOI

      10.1103/PhysRevD.95.124002

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] General invertible transformation and physical degrees of freedom2017

    • Author(s)
      Takahashi Kazufumi、Motohashi Hayato、Suyama Teruaki、Kobayashi Tsutomu
    • Journal Title

      Physical Review D

      Volume: 95 Pages: 084053

    • DOI

      10.1103/PhysRevD.95.084053

    • Peer Reviewed
  • [Journal Article] Correlated primordial spectra in effective theory of inflation2017

    • Author(s)
      Gong Jinn-Ouk、Yamaguchi Masahide
    • Journal Title

      Physical Review D

      Volume: 95 Pages: 083510

    • DOI

      10.1103/PhysRevD.95.083510

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] CMB scale dependent non-Gaussianity from massive gravity during inflation2017

    • Author(s)
      Dom?nech Guillem、Hiramatsu Takashi、Lin Chunshan、Sasaki Misao、Shiraishi Maresuke、Wang Yi
    • Journal Title

      Journal of Cosmology and Astroparticle Physics

      Volume: 2017 Pages: 034~034

    • DOI

      10.1088/1475-7516/2017/05/034

    • Peer Reviewed / Int'l Joint Research
  • [Presentation] Flaxion: a minimal extension to solve puzzles in the standard model2017

    • Author(s)
      中山和則
    • Organizer
      Focus Meeting: new perspectives on light particles, Institute for Basic Science, Korea
    • Int'l Joint Research / Invited
  • [Presentation] LIGO and primordial black holes2017

    • Author(s)
      須山輝明
    • Organizer
      Conference on Particle Physics, HongKong University of Science and Technology, HongKong
    • Int'l Joint Research / Invited
  • [Presentation] Primordial black holes and gravitational waves2017

    • Author(s)
      須山輝明
    • Organizer
      International Symposium on Cosmology and Particle Astrophysics (CosPA 2017)
    • Int'l Joint Research / Invited
  • [Presentation] Inflationary Massive Gravity2017

    • Author(s)
      佐々木節
    • Organizer
      Recent Developments in General Relativity, Jerusalem
    • Int'l Joint Research / Invited
  • [Presentation] Inflationary Massive Gravity and Gravitational Waves2017

    • Author(s)
      佐々木節
    • Organizer
      International Symposium on Gravitational Waves (ISGW2017), Beijing
    • Int'l Joint Research / Invited
  • [Presentation] Inflationary massive gravity2017

    • Author(s)
      佐々木節
    • Organizer
      13th International Conference on Gravitation, Astrophysics, and Cosmology 15th Italian-Korean Symposium on Relativistic Astrophysics A Joint Meeting, Seoul
    • Int'l Joint Research / Invited
  • [Presentation] Inflation, Primordial Black Holes and Gravitational Waves2017

    • Author(s)
      佐々木節
    • Organizer
      NCTS 20th Anniversary Symposium: Frontiers in Physics, Taipei
    • Int'l Joint Research / Invited
  • [Presentation] Primordial black holes and gravitational waves2017

    • Author(s)
      佐々木節
    • Organizer
      International Conference on Particle Physics and Cosmology (COSMO-17), Paris
    • Int'l Joint Research / Invited
  • [Presentation] Inflationary Massive Gravity and Gravitational Waves2017

    • Author(s)
      佐々木節
    • Organizer
      Third LeCosPA International Symposium "Cosmic Prospects", Taipei
    • Int'l Joint Research / Invited
  • [Book] 相対性理論2017

    • Author(s)
      小林 努
    • Total Pages
      208
    • Publisher
      日本評論社
    • ISBN
      978-4-535-80640-5
  • [Remarks] 加速宇宙 -- インフレーション宇宙のメカニズムとその物理の多角的検証

    • URL

      http://www2.yukawa.kyoto-u.ac.jp/~accel_a01/index.html

  • [Funded Workshop] Next-generation cosmology with large-scale structure: CosKASI-ICG-NAOC-YITP joint workshop2017

  • [Funded Workshop] Issues on Large Scale Perturbations from Inflation2017

  • [Funded Workshop] International Symposium on Cosmology and Particle Astrophysics (CosPA 2017)2017

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Published: 2018-12-17  

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