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Investigating non-linear property of primordial fluctuations from future cosmological observations and probing the physics of the early Universe

Research Project

Project/Area Number 15K17659
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Particle/Nuclear/Cosmic ray/Astro physics
Research InstitutionNagoya University (2018)
Rikkyo University (2015-2017)

Principal Investigator

YOKOYAMA Shuichiro  名古屋大学, 基礎理論研究センター, 助教 (80529024)

Project Period (FY) 2015-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2018: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2017: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2016: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2015: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Keywordsインフレーション / 初期密度揺らぎ / 原始ブラックホール / 宇宙マイクロ波背景輻射 / 宇宙大規模構造 / 初期非ガウス性 / 背景重力波 / 初期磁場 / 修正重力理論 / 初期揺らぎ / 暗黒物質
Outline of Final Research Achievements

I have investigated the possibility of probing the physics of early Universe from future planned cosmological observations. As a result, I have found that from the bunch of future cosmological observations we could obtain new and precise information about the physics of the early Universe, in particular, inflation.
As another important research result, I and collaborators open new research fields for the physics of the early Universe through the primordial black boles, by pointing out the possible detection of the primordial black holes as a source of the gravitational waves detected by LIGO/VIRGO collaboration.

Academic Significance and Societal Importance of the Research Achievements

上記本研究で得られた結果により、2020年代の精密宇宙論的観測を通じて超高温高密度状態であったと考えられる初期宇宙の様子がより明らかになっていくことが期待される。つまり、地上実験では到底到達不可能なエネルギー状態における物理学の検証につながると考えられる。現在の物理学の基礎となっている素粒子標準模型や一般相対性理論がそのような高エネルギー状態で適用可能かどうかについての重要な知見が得られると考えられ、真の物理理論は何かという問いに迫るという意味で学術的に重要である。

Report

(5 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • 2016 Research-status Report
  • 2015 Research-status Report
  • Research Products

    (36 results)

All 2019 2018 2017 2016 2015

All Journal Article (19 results) (of which Int'l Joint Research: 6 results,  Peer Reviewed: 19 results,  Open Access: 10 results,  Acknowledgement Compliant: 5 results) Presentation (17 results) (of which Int'l Joint Research: 10 results,  Invited: 10 results)

  • [Journal Article] Probing primordial non-Gaussianity with 21 cm fluctuations from minihalos2019

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

      JCAP

      Volume: 1902 Issue: 02 Pages: 33-33

    • DOI

      10.1088/1475-7516/2019/02/033

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Matter bispectrum beyond Horndeski theories2018

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

      Physical Review D

      Volume: 97 Issue: 10 Pages: 1-12

    • DOI

      10.1103/physrevd.97.103517

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Limits on primordial magnetic fields from direct detection experiments of gravitational wave background2018

    • Author(s)
      Saga, Shohei and Tashiro, Hiroyuki and Yokoyama, Shuichiro
    • Journal Title

      Physical Review D

      Volume: 98 Issue: 8 Pages: 83518-83518

    • DOI

      10.1103/physrevd.98.083518

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Hunting for statistical anisotropy in tensor modes with B-mode observations2018

    • Author(s)
      Hiramatsu Takashi、Yokoyama Shuichiro、Fujita Tomohiro、Obata Ippei
    • Journal Title

      Physical Review D

      Volume: 98 Issue: 8 Pages: 83522-83522

    • DOI

      10.1103/physrevd.98.083522

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access
  • [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 Issue: 02 Pages: 053-053

    • DOI

      10.1088/1475-7516/2018/02/053

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [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

      Astrophysical Journal

      Volume: 854 Issue: 1 Pages: 1-13

    • DOI

      10.3847/1538-4357/aaa7f4

    • NAID

      120006466622

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Primordial black holes?perspectives in gravitational wave astronomy2018

    • Author(s)
      Sasaki Misao、Suyama Teruaki、Tanaka Takahiro、Yokoyama Shuichiro
    • Journal Title

      Classical and Quantum Gravity

      Volume: 35 Issue: 6 Pages: 1-76

    • DOI

      10.1088/1361-6382/aaa7b4

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Spin distribution of primordial black holes2017

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

      Progress of Theoretical and Experimental Physics

      Volume: 083E01 Issue: 8 Pages: 1-8

    • DOI

      10.1093/ptep/ptx087

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Refined study of isocurvature fluctuations in the curvaton scenario2017

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

      Journal of Cosmology and Astroparticle Physics

      Volume: 1712 Issue: 12 Pages: 042-042

    • DOI

      10.1088/1475-7516/2017/12/042

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Magnetic reheating2017

    • Author(s)
      Saga Shohei、Tashiro Hiroyuki、Yokoyama Shuichiro
    • Journal Title

      Monthly Notices of the Royal Astronomical Society: Letters

      Volume: 474 Issue: 1 Pages: L52-L55

    • DOI

      10.1093/mnrasl/slx195

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access
  • [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 Issue: 12 Pages: 123516-123516

    • DOI

      10.1103/physrevd.96.123516

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Journal Article] Constraining the epoch-of-reionization model parameters with the 21-cm bispectrum2017

    • Author(s)
      Hayato Shimabukuro, Shintaro Yoshiura, Keitaro Takahashi, Shuichiro Yokoyama, Kiyotomo Ichiki
    • Journal Title

      Monthly Notices of the Royal Astronomical Society

      Volume: 468 Issue: 2 Pages: 1542-1550

    • DOI

      10.1093/mnras/stx530

    • Related Report
      2016 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] Multitracer technique for galaxy bispectrum: An application to constraints on nonlocal primordial non-Gaussianities2017

    • Author(s)
      Daisuke Yamauchi, Shuichiro Yokoyama, Keitaro Takahashi
    • Journal Title

      Physical Review D

      Volume: 95 Issue: 6 Pages: 1-6

    • DOI

      10.1103/physrevd.95.063530

    • Related Report
      2016 Research-status Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Primordial black hole scenario for the gravitational-wave event GW1509142016

    • Author(s)
      Misao Sasaki, Teruaki Suyama, Takahiro Tanaka, Shuichiro Yokoyama
    • Journal Title

      Physical Review Letters

      Volume: 117 Issue: 6 Pages: 1-5

    • DOI

      10.1103/physrevlett.117.061101

    • NAID

      120005825908

    • Related Report
      2016 Research-status Report
    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Journal Article] Ultra slow-roll G-inflation2016

    • Author(s)
      Shin'ichi Hirano, Tsutomu Kobayashi, Shuichiro Yokoyama
    • Journal Title

      Physical Review

      Volume: D94 Issue: 10 Pages: 1-9

    • DOI

      10.1103/physrevd.94.103515

    • Related Report
      2016 Research-status Report
    • Peer Reviewed
  • [Journal Article] Constraining equilateral-type primordial non-Gaussianities from imaging surveys2016

    • Author(s)
      Ichihiko Hashimoto, Shuntaro Mizuno, Shuichiro Yokoyama
    • Journal Title

      Physical Review D

      Volume: 94 Issue: 4 Pages: 043532-043532

    • DOI

      10.1103/physrevd.94.043532

    • Related Report
      2016 Research-status Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] 21cm-line bispectrum as method to probe Cosmic Dawn and Epoch of Reionization2016

    • Author(s)
      Hayato Shimabukuro, Shintaro Yoshiura, Keitaro Takahashi, Shuichiro Yokoyama, Kiyotomo Ichiki
    • Journal Title

      Monthly Notices of the Royal Astronomical Society

      Volume: 458 Issue: 3 Pages: 3003-3011

    • DOI

      10.1093/mnras/stw482

    • Related Report
      2015 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] Primordial black holes as biased tracers2015

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

      Physical Review D

      Volume: 91, 12 Issue: 12

    • DOI

      10.1103/physrevd.91.123534

    • Related Report
      2015 Research-status Report
    • Peer Reviewed
  • [Journal Article] Halo/Galaxy Bispectrum with Equilateral-type Primordial Trispectrum2015

    • Author(s)
      Shuntaro Mizuno, Shuichiro Yokoyama
    • Journal Title

      Physical Review D

      Volume: 91, 12 Issue: 12

    • DOI

      10.1103/physrevd.91.123521

    • Related Report
      2015 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] A new constraint on PBH abundance and its implications2019

    • Author(s)
      Yokoyama Shuichiro
    • Organizer
      The 2nd NRF-JSPS workshop in particle physics, cosmology and gravitation
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Clustering of primordial black holes2019

    • Author(s)
      Yokoyama Shuichiro
    • Organizer
      The 2nd Korea-Japan bilateral workshop on String Axion Cosmology
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Dark Energy2019

    • Author(s)
      Yokoyama Shuichiro
    • Organizer
      The 4th KMI International Symposium (KMI2019)
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Clustering of primordial black holes2019

    • Author(s)
      Yokoyama Shuichiro
    • Organizer
      Why does the Universe accelerate?-Exhaustive study and challenge for the future -MAR2019
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 宇宙論の諸問題2019

    • Author(s)
      横山修一郎
    • Organizer
      銀河進化と遠方宇宙2019(第五回)
    • Related Report
      2018 Annual Research Report
    • Invited
  • [Presentation] Gravitational Wave Background from Primordial Magnetic Fields2018

    • Author(s)
      Yokoyama Shuichiro
    • Organizer
      The first NRF-JSPS workshop in particle physics, cosmology, and gravitation
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Clustering of primordial black holes2018

    • Author(s)
      横山修一郎、須山輝明
    • Organizer
      日本物理学会2018年秋季大会
    • Related Report
      2018 Annual Research Report
  • [Presentation] 暗黒物質としての原始ブラックホールと重力波直接観測2018

    • Author(s)
      横山修一郎
    • Organizer
      第17回 DECIGOワークショップ
    • Related Report
      2018 Annual Research Report
    • Invited
  • [Presentation] running of spectral indexを用いたインフレーションモデルの峻別2017

    • Author(s)
      関口豊和、田代寛之、高橋智、横山修一郎
    • Organizer
      日本物理学会第72回年次大会
    • Place of Presentation
      大阪大学(大阪府豊中市)
    • Year and Date
      2017-03-17
    • Related Report
      2016 Research-status Report
  • [Presentation] Refined study of isocurvature fluctuations in the curvaton2017

    • Author(s)
      Shuichiro Yokoyama
    • Organizer
      なぜ宇宙は加速するのか?- 徹底的究明と将来への挑戦-
    • Place of Presentation
      KEK(茨城県つくば市)
    • Year and Date
      2017-03-08
    • Related Report
      2016 Research-status Report
  • [Presentation] 観測的インフレーション宇宙論2017

    • Author(s)
      横山修一郎
    • Organizer
      第47回天文・天体物理若手夏の学校
    • Related Report
      2017 Research-status Report
    • Invited
  • [Presentation] Isocurvature fluctuations in the curvaton scenario2017

    • Author(s)
      Yokoyama Shuichiro
    • Organizer
      The origin and evolution of the Universe
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Refined Study of Isocurvature Fluctuations in the Curvaton2016

    • Author(s)
      Shuichiro Yokoyama
    • Organizer
      JGRG26
    • Place of Presentation
      大阪市立大学(大阪府大阪市住吉区)
    • Year and Date
      2016-10-24
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research
  • [Presentation] PBH scenario for GW1509142016

    • Author(s)
      Shuichiro Yokoyama
    • Organizer
      Workshop on Particle Physics, Cosmology, and Gravitation
    • Place of Presentation
      東京工業大学(東京都目黒区)
    • Year and Date
      2016-09-28
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Revisiting matter isocurvature fluctuations in the curvaton scenario2016

    • Author(s)
      Shuichiro Yokoyama
    • Organizer
      COSMO-16
    • Place of Presentation
      ミシガン大学(USA)
    • Year and Date
      2016-08-08
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research
  • [Presentation] カーバトンシナリオにおける物質等曲率揺らぎについて2015

    • Author(s)
      横山修一郎、北嶋直弥、高橋智、David Langlois
    • Organizer
      日本物理学会2015年秋季大会
    • Place of Presentation
      大阪市立大学、大阪、日本
    • Year and Date
      2015-09-25
    • Related Report
      2015 Research-status Report
  • [Presentation] Excavating primordial non-Gaussianities in large scale structure2015

    • Author(s)
      Shuichiro Yokoyama
    • Organizer
      International Workshop on Particle Physics and Cosmology
    • Place of Presentation
      東北大学、仙台、日本
    • Year and Date
      2015-09-14
    • Related Report
      2015 Research-status Report
    • Int'l Joint Research / Invited

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Published: 2015-04-16   Modified: 2020-03-30  

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