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Curvature Perturbations and Primordial Black Hole Formation in the Inflationary Universe

Research Project

Project/Area Number 18J01992
Research Category

Grant-in-Aid for JSPS Fellows

Allocation TypeSingle-year Grants
Section国内
Research Field Particle/Nuclear/Cosmic ray/Astro physics
Research InstitutionNagoya University

Principal Investigator

多田 祐一郎  名古屋大学, 理学研究科, 特別研究員(PD)

Project Period (FY) 2018-04-25 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2020: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2019: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2018: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Keywords宇宙論 / インフレーション / 原始ブラックホール / 重力波 / ストカスティック形式
Outline of Annual Research Achievements

2020年度は計6本の論文を出版し, 特にフランスとの共同研究である "A manifestly covariant theory of multifield stochastic inflation in phase space" (arXiv: 2008.07497, JCAP accepted) ではインフレーションの確率形式を一から見直し, 共変かつ数学的に一意な定式化に成功した. 本論文の前研究である2019年出版の "Inflationary stochastic anomalies" (Class. Quant. Grav. 36, no. 7, 07LT01 (2019)) は CQG の 2019--20 のハイライトに選ばれた. 一連の研究は3つの国際研究会, 1つの国内研究会, 5つのセミナーにおいて発表し, Online JGRG Workshop 2020 での発表は Outstanding Presentation Award Gold Prize を受賞した. また修士一年の学生らとの共同研究 "Conformal inflation in the metric-affine geometry" (EPL 132, 3 (2020)) は EPL の editor's choice に選ばれた.

Research Progress Status

令和2年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

令和2年度が最終年度であるため、記入しない。

Report

(3 results)
  • 2020 Annual Research Report
  • 2019 Annual Research Report
  • 2018 Annual Research Report
  • Research Products

    (38 results)

All 2021 2020 2019 2018 Other

All Int'l Joint Research (3 results) Journal Article (11 results) (of which Int'l Joint Research: 3 results,  Open Access: 7 results,  Peer Reviewed: 6 results) Presentation (22 results) (of which Int'l Joint Research: 17 results,  Invited: 1 results) Remarks (2 results)

  • [Int'l Joint Research] Institut d’Astrophysique de Paris(フランス)

    • Related Report
      2020 Annual Research Report
  • [Int'l Joint Research] Institut d’Astrophysique de Paris/Ecole Normale Superieure(フランス)

    • Related Report
      2019 Annual Research Report
  • [Int'l Joint Research] IAP/APC(フランス)

    • Related Report
      2018 Annual Research Report
  • [Journal Article] Minimal $k$-inflation in light of the conformal metric-affine geometry2021

    • Author(s)
      Yusuke Mikura, Yuichiro Tada and Shuichiro Yokoyama
    • Journal Title

      arXiv

      Volume: 2103.13045

    • Related Report
      2020 Annual Research Report
    • Open Access
  • [Journal Article] Revisiting non-Gaussianity in non-attractor inflation models in the light of the cosmological soft theorem2021

    • Author(s)
      Teruaki Suyama, Yuichiro Tada and Masahide Yamaguchi
    • Journal Title

      arXiv

      Volume: 2101.10682

    • Related Report
      2020 Annual Research Report
    • Open Access
  • [Journal Article] Induced gravitational waves as a cosmological probe of the sound speed during the QCD phase transition2020

    • Author(s)
      Katsuya T. Abe, Yuichiro Tada and Ikumi Ueda
    • Journal Title

      arXiv

      Volume: 2010.06193

    • Related Report
      2020 Annual Research Report
    • Open Access
  • [Journal Article] Local observer effect on the cosmological soft theorem2020

    • Author(s)
      Suyama Teruaki、Tada Yuichiro、Yamaguchi Masahide
    • Journal Title

      Progress of Theoretical and Experimental Physics

      Volume: 2020 Issue: 11 Pages: 1-6

    • DOI

      10.1093/ptep/ptaa144

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] A manifestly covariant theory of multifield stochastic inflation in phase space2020

    • Author(s)
      Lucas Pinol, Sebasiten Renaux-Petel and Yuichiro Tada
    • Journal Title

      arXiv

      Volume: 2008.07497

    • Related Report
      2020 Annual Research Report
    • Open Access / Int'l Joint Research
  • [Journal Article] Conformal inflation in the metric-affine geometry2020

    • Author(s)
      Mikura Y.、Tada Y.、Yokoyama S.
    • Journal Title

      EPL (Europhysics Letters)

      Volume: 132 Issue: 3 Pages: 39001-39001

    • DOI

      10.1209/0295-5075/132/39001

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Escape from the swampland with a spectator field2020

    • Author(s)
      Kogai Kazuhiro、Tada Yuichiro
    • Journal Title

      Physical Review D

      Volume: 101 Issue: 10 Pages: 103514-103514

    • DOI

      10.1103/physrevd.101.103514

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Stochastic inflation with an extremely large number of e-folds2020

    • Author(s)
      Kitajima Naoya、Tada Yuichiro、Takahashi Fuminobu
    • Journal Title

      Physics Letters B

      Volume: 800 Pages: 135097-135097

    • DOI

      10.1016/j.physletb.2019.135097

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Primordial black hole tower: Dark matter, earth-mass, and LIGO black holes2019

    • Author(s)
      Tada Yuichiro、Yokoyama Shuichiro
    • Journal Title

      Physical Review D

      Volume: 100 Issue: 2 Pages: 023537-023537

    • DOI

      10.1103/physrevd.100.023537

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Inflationary stochastic anomalies2019

    • Author(s)
      Pinol Lucas、Renaux-Petel Sebastien、Tada Yuichiro
    • Journal Title

      Classical and Quantum Gravity

      Volume: 36 Issue: 7 Pages: 07LT01-07LT01

    • DOI

      10.1088/1361-6382/ab097f

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Primordial black hole tower: Dark matter, earth-mass, and LIGO black holes2019

    • Author(s)
      Tada Yuichiro、Yokoyama Shuichiro
    • Journal Title

      arXiv

      Volume: 1904.10298 Pages: 10298-10298

    • Related Report
      2018 Annual Research Report
  • [Presentation] インフレーションの確率形式に対する共変な定式化2021

    • Author(s)
      多田祐一郎
    • Organizer
      日本物理学会第76回年次大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] Manifestly covariant theory of stochastic inflation2020

    • Author(s)
      Yuichiro Tada
    • Organizer
      Online JGRG Workshop 2020
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] StocDeltaN: numerical approach to inflation in combination of the stochastic and delta N formalism2020

    • Author(s)
      Yuichiro Tada
    • Organizer
      PBH & Stochastic inflation workshop
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Manifestly covariant theory of stochastic inflation2020

    • Author(s)
      Yuichiro Tada
    • Organizer
      The 14th International Conference on Gravitation, Astrophysics and Cosmology (ICGAC14)
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Escape from the swamp with spectator2020

    • Author(s)
      多田祐一郎
    • Organizer
      日本物理学会秋季大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] Primordial black hole tower: Dark matter, earth-mass, and LIGO black holes2019

    • Author(s)
      多田祐一郎
    • Organizer
      Focus Week on Primordial Black Holes
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Stochastic inflation with an extremely large number of e-folds2019

    • Author(s)
      多田祐一郎
    • Organizer
      JGRG29
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Stochastic approach to non-Gaussianity2019

    • Author(s)
      多田祐一郎
    • Organizer
      Theoretical aspects of non-Gaussianity from modern perspectives
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Primordial black hole tower: Dark matter, earth-mass, and LIGO black holes2019

    • Author(s)
      多田祐一郎
    • Organizer
      GWPAW 2019
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Primordial black hole tower: Dark matter, earth-mass, and LIGO black holes2019

    • Author(s)
      多田祐一郎
    • Organizer
      COSMO19
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Primordial black hole tower: Dark matter, earth-mass, and LIGO black holes2019

    • Author(s)
      多田祐一郎
    • Organizer
      15th Rencontres du Vietnam "COSMOLOGY"
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Stochastic formalism and curvature perturbation2019

    • Author(s)
      多田祐一郎
    • Organizer
      3-day workshop: INFLATION AND GEOMETRY
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] PBH tower in multi-phase inflation2019

    • Author(s)
      多田祐一郎
    • Organizer
      2-day mini-workshop: Axion Cosmology
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] PBH tower in multi-phase inflation2019

    • Author(s)
      多田祐一郎
    • Organizer
      Future Perspective in Cosmology and Gravity
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 極長ストカスティックインフレーション2019

    • Author(s)
      多田祐一郎
    • Organizer
      日本物理学会 第75回年次大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 多段階インフレーションによる原始ブラックホールタワー2019

    • Author(s)
      多田祐一郎
    • Organizer
      日本物理学会秋季大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] PBH tower in multi-phase inflation2019

    • Author(s)
      Tada Yuichiro、Yokoyama Shuichiro
    • Organizer
      Accelerating Universe in the Dark
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Aspects of primordial black hole as dark matter2019

    • Author(s)
      Inomata Keisuke、Kawasaki Masahiro、Kusenko Alexander、Mukaida Kyohei、Tada Yuichiro、Yanagida T. Tsutomu、Yokoyama Shuichiro
    • Organizer
      FAPESP-JSPS Workshop on dark energy, dark matter, and galaxies
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Stochastic formalism and curvature perturbations2018

    • Author(s)
      Fujita Tomohiro、Pinol Lucas、Renaux-Petel Sebastien、Tada Yuichiro、Tokuda Junsei
    • Organizer
      JGRG28
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Stochastic inflation in a general field space2018

    • Author(s)
      Fujita Tomohiro、Pinol Lucas、Renaux-Petel Sebastien、Tada Yuichiro、Tokuda Junsei
    • Organizer
      MOGRA 2018
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Stochastic inflation in a general field space2018

    • Author(s)
      Fujita Tomohiro、Pinol Lucas、Renaux-Petel Sebastien、Tada Yuichiro、Tokuda Junsei
    • Organizer
      Fifteenth Marcel Grosmann Meeting
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] ストカスティックインフレーションのノイズ処方について2018

    • Author(s)
      藤田智弘、Pinol Lucas、Renaux-Petel Sebastien、多田祐一郎、徳田順生
    • Organizer
      日本物理学会秋季大会
    • Related Report
      2018 Annual Research Report
  • [Remarks]

    • URL

      https://nekomammat.github.io/indexJP.html

    • Related Report
      2020 Annual Research Report
  • [Remarks] Yuichiro TADA

    • URL

      https://nekomammat.github.io

    • Related Report
      2018 Annual Research Report

URL: 

Published: 2018-05-01   Modified: 2024-03-26  

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