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Exploring the early Universe with cosmological observations and particle physics

Research Project

Project/Area Number 23740195
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Particle/Nuclear/Cosmic ray/Astro physics
Research InstitutionSaga University

Principal Investigator

TAKAHASHI Tomo  佐賀大学, 工学(系)研究科(研究院), 准教授 (60432960)

Project Period (FY) 2011-04-28 – 2015-03-31
Project Status Completed (Fiscal Year 2014)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2014: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2013: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2012: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2011: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Keywords密度揺らぎ / 初期宇宙 / インフレーション / 重力波 / 初期密度揺らぎ / 宇宙密度揺らぎ / 非ガウス性 / 等曲率揺らぎ / 21cm線
Outline of Final Research Achievements

Recent cosmological observations such as Planck satellite have revealed various aspects of the Universe. In this research project, focusing on primordial density fluctuations, we have studied its generation mechanism and the evolution of the early Universe. By using the data from current cosmological observations such as WMAP and Planck, we have investigated various generation mechanisms of primordial fluctuations and the thermal history of the Universe. By taking account of models of particle physics, we have discussed possible scenarios of the evolution of the early Universe. The prospects of future observations of how such scenarios can be probed have also been discussed.

Report

(5 results)
  • 2014 Annual Research Report   Final Research Report ( PDF )
  • 2013 Research-status Report
  • 2012 Research-status Report
  • 2011 Research-status Report
  • Research Products

    (25 results)

All 2015 2014 2013 2012 2011 Other

All Journal Article (20 results) (of which Peer Reviewed: 20 results,  Open Access: 2 results,  Acknowledgement Compliant: 7 results) Presentation (5 results) (of which Invited: 3 results)

  • [Journal Article] Blue-tilted Tensor Spectrum and Thermal History of the Universe2015

    • Author(s)
      Sachiko Kuroyanagi, Tomo Takahashi, Shuichiro Yokoyama
    • Journal Title

      Journal of Cosmology and Astroparticle Physics

      Volume: 1502, 003 Issue: 02 Pages: 1-23

    • DOI

      10.1088/1475-7516/2015/02/003

    • Related Report
      2014 Annual Research Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Isocurvature perturbations and tensor mode in light of Planck and BICEP22014

    • Author(s)
      Masahiro Kawasaki, Toyokazu Sekiguchi, Tomo Takahashi, Shuichiro Yokoyama
    • Journal Title

      Journal of Cosmology and Astroparticle Physics

      Volume: 1408, 043 Issue: 08 Pages: 1-14

    • DOI

      10.1088/1475-7516/2014/08/043

    • Related Report
      2014 Annual Research Report
    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Journal Article] Affleck-Dine baryogenesis with R-parity violation2014

    • Author(s)
      檜垣徹太郎、中山和則、齋川賢一、高橋智、山口昌英
    • Journal Title

      Physical Review D

      Volume: 90 Issue: 4 Pages: 0450011-20

    • DOI

      10.1103/physrevd.90.045001

    • Related Report
      2014 Annual Research Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Probing Lepton Asymmetry with 21 cm Fluctuations2014

    • Author(s)
      Kazunori Kohri, Yoshihiko Oyama, Toyokazu Sekiguchi and Tomo Takahashi
    • Journal Title

      Journal of Cosmology and Astroparticle Physics

      Volume: 09(2014) Issue: 09 Pages: 014-014

    • DOI

      10.1088/1475-7516/2014/09/014

    • Related Report
      2014 Annual Research Report
    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Journal Article] Thermal Effects and Sudden Decay Approximation in the Curvaton Scenario2014

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

      Journal of Cosmology and Astroparticle Physics

      Volume: 1410, 032 Issue: 10 Pages: 1-21

    • DOI

      10.1088/1475-7516/2014/10/032

    • Related Report
      2014 Annual Research Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] CMB mu distortion from primordial gravitational waves2014

    • Author(s)
      Atsuhisa Ota, Tomo Takahashi, Hiroyuki Tashiroc, and Masahide Yamaguchi
    • Journal Title

      JCAP

      Volume: 10 Issue: 10 Pages: 029-029

    • DOI

      10.1088/1475-7516/2014/10/029

    • Related Report
      2014 Annual Research Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Studying Inflation with Future Space-Based Gravitational Wave Detectors2014

    • Author(s)
      Ryusuke Jinno, Takeo Moroi, Tomo Takahashi
    • Journal Title

      Journal of Cosmology and Astroparticle Physics

      Volume: 2014 Issue: 12 Pages: 12-12

    • DOI

      10.1088/1475-7516/2014/12/006

    • Related Report
      2014 Annual Research Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] The minimal curvaton-higgs model2014

    • Author(s)
      Kari Enqvist, Rose N. Lerner, Tomo Takahashi
    • Journal Title

      Journal of Cosmology and Astroparticle physics

      Volume: 01 Pages: 6-6

    • Related Report
      2013 Research-status Report
    • Peer Reviewed
  • [Journal Article] Higher order nonlinear parameters with Planck constraints2014

    • Author(s)
      Jinn-Ouk Gong and Tomo Takahashi
    • Journal Title

      Physical Review D

      Volume: 89 Pages: 23516-23516

    • Related Report
      2013 Research-status Report
    • Peer Reviewed
  • [Journal Article] Spectator field models in light of spectral index after Planck2013

    • Author(s)
      Takeshi Kobayashi, Fuminobu Takahashi, Tomo Takahashi and Masahide Yamaguchi
    • Journal Title

      Journal of Cosmology and Astroparticle physics

      Volume: 10 Pages: 42-42

    • Related Report
      2013 Research-status Report
    • Peer Reviewed
  • [Journal Article] Precise measurements of primordial power spectrum with 21 cm fluctuations2013

    • Author(s)
      Kazunori Kohri, Yoshihiko Oyama, Toyokazu Sekiguchi and Tomo Takahashi
    • Journal Title

      Journal of Cosmology and Astroparticle physics

      Volume: 10 Pages: 65-65

    • Related Report
      2013 Research-status Report
    • Peer Reviewed
  • [Journal Article] Mixed Inflaton and Spectator Field Models after Planck2013

    • Author(s)
      Kari Enqvist, Tomo Takahashi
    • Journal Title

      Journal of Cosmology and Astroparticle physics

      Volume: 10 Pages: 34-34

    • Related Report
      2013 Research-status Report
    • Peer Reviewed
  • [Journal Article] Structure of dark matter halos in warm dark matter models and in models with long-lived bharged massive partcle2013

    • Author(s)
      Kamada. A, . Yoshida. N, K. Kobri, T. Takahashi
    • Journal Title

      Journal of Cosmology and Astroparticle Physics

      Volume: 2.013 Issue: 03 Pages: 8-8

    • DOI

      10.1088/1475-7516/2013/03/008

    • Related Report
      2012 Research-status Report
    • Peer Reviewed
  • [Journal Article] Extended analysis of CMB constraints on non-Gaussianity in isocurvature perturbations2013

    • Author(s)
      日影千秋、川崎雅裕、関口豊和、高橋智
    • Journal Title

      Journal of Cosmology and Astroparticle Physics

      Volume: 1303 Issue: 03 Pages: 20-20

    • DOI

      10.1088/1475-7516/2013/03/020

    • Related Report
      2012 Research-status Report
    • Peer Reviewed
  • [Journal Article] Runnings in the curvaton2012

    • Author(s)
      Takeshi Kobayashi and Tomo Takahashi
    • Journal Title

      Journal of Cosmology and Astroparticle Physics

      Volume: 06 Issue: 06 Pages: 4-4

    • DOI

      10.1088/1475-7516/2012/06/004

    • Related Report
      2012 Research-status Report
    • Peer Reviewed
  • [Journal Article] Generalized Higgs inflation2012

    • Author(s)
      Kohei Kamada, Tsutomu Kobayashi, Tomo Takahashi, Masahide Yamaguchi and Jun’ichi Yokoyama
    • Journal Title

      Physical Review D

      Volume: 86 Pages: 23504-23504

    • Related Report
      2012 Research-status Report
    • Peer Reviewed
  • [Journal Article] Dark radiation from modulated reheating2012

    • Author(s)
      Takeshi Kobayashi, Fuminobu Takahashi, Tomo Takahashi, Masahide Yamaguchi
    • Journal Title

      JCAP

      Volume: 03 Pages: 36-36

    • Related Report
      2011 Research-status Report
    • Peer Reviewed
  • [Journal Article] Differentiating CDM and baryon isocurvature models with 21 cm fluctuations2011

    • Author(s)
      Masahiro Kawasaki, Toyokazu Sekiguchi, Tomo Takahashi
    • Journal Title

      JCAP

      Volume: 10 Pages: 28-28

    • Related Report
      2011 Research-status Report
    • Peer Reviewed
  • [Journal Article] Higher order corrections to the primordial gravitational wave spectrum and its impact on parameter estimates for inflation2011

    • Author(s)
      Sachiko Kuroyanagi, Tomo Takahashi
    • Journal Title

      JCAP

      Volume: 10 Pages: 6-6

    • Related Report
      2011 Research-status Report
    • Peer Reviewed
  • [Journal Article] Strongly scale-dependent polyspectra from curvaton self-interactions2011

    • Author(s)
      Christian T. Byrnes, Kari Enqvist, Sami Nurmi, Tomo Takahashi
    • Journal Title

      JCAP

      Volume: 11 Pages: 11-11

    • Related Report
      2011 Research-status Report
    • Peer Reviewed
  • [Presentation] Studying the inflationary Universe with gravitational waves2014

    • Author(s)
      Tomo Takahashi
    • Organizer
      JGRG 24
    • Place of Presentation
      Kavli IPMU
    • Year and Date
      2014-11-14
    • Related Report
      2014 Annual Research Report
  • [Presentation] Scale-dependence of non-Gaussianities as a probe of the early Universe

    • Author(s)
      Tomo Takahashi
    • Organizer
      Corfu Summer Institute, TR33 workshop
    • Place of Presentation
      Corfu, Greece
    • Related Report
      2012 Research-status Report
  • [Presentation] Probing Dark Matter with CMB and LSS

    • Author(s)
      Tomo Takahashi
    • Organizer
      Workshop on Dark Matter Phenomenology
    • Place of Presentation
      Pohang, Korea
    • Related Report
      2012 Research-status Report
    • Invited
  • [Presentation] Probing the early Universe with Primordial Fluctuations: beyond fNL

    • Author(s)
      Tomo Takahashi
    • Organizer
      PPC2012
    • Place of Presentation
      Seoul, Korea
    • Related Report
      2012 Research-status Report
    • Invited
  • [Presentation] 宇宙密度揺らぎの非ガウス性とは

    • Author(s)
      高橋智
    • Organizer
      日本物理学会第68回年次大会 シンポジウム「宇宙密度揺らぎの非ガウス性」
    • Place of Presentation
      広島大学
    • Related Report
      2012 Research-status Report
    • Invited

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Published: 2011-08-05   Modified: 2019-07-29  

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