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2010 Fiscal Year Final Research Report

Particle cosmology in the era of precision cosmology

Research Project

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Project/Area Number 19740145
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeSingle-year Grants
Research Field Particle/Nuclear/Cosmic ray/Astro physics
Research InstitutionSaga University

Principal Investigator

TAKAHASHI Tomo  Saga University, 工学系研究科, 准教授 (60432960)

Project Period (FY) 2007 – 2010
Keywords初期宇宙 / 初期揺らぎ / 非ガウス性
Research Abstract

Current cosmological observations are so precise that they give us a lot of information and profound insight on the evolution of the Universe from the very early epoch to the present, as well as the nature of dark components such as dark matter and dark energy. In this research project, we have investigated various aspects of cosmological density fluctuations, in particular, non-Gaussianity of primordial fluctuations. We have studied various models of the early Universe, focusing on its observational signatures for non-Gaussianity, which would give many implications for understanding of the evolution of the Universe and particle physics models.

  • Research Products

    (38 results)

All 2011 2010 2009 2008 2007

All Journal Article (24 results) Presentation (14 results)

  • [Journal Article] Primordial Trispectrum from Isocurvature Fluctuations2011

    • Author(s)
      David Langlois, Tomo Takahashi
    • Journal Title

      JCAP 1102

      Pages: 020

  • [Journal Article] On Classification of Models of Large Local-Type Non-Gaussianity2010

    • Author(s)
      Teruaki Suyama, Tomo Takahashi, Masahide Yamaguchi, Shuichiro Yokoyama
    • Journal Title

      JCAP 1012

      Pages: 030

  • [Journal Article] Scale-dependence of Non-Gaussianity in the Curvaton Model2010

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

      JCAP 1009

      Pages: 026

  • [Journal Article] Dark energy from primordial inflationary quantum fluctuations2010

    • Author(s)
      Christophe Ringeval, Teruaki Suyama, Tomo Takahashi, Masahide Yamaguchi, Shuichiro Yokoyama
    • Journal Title

      Phys.Rev.Lett. 105

      Pages: 121301

  • [Journal Article] Non-Gaussian Fingerprints of Self-Interacting Curvaton2010

    • Author(s)
      Kari Enqvist, Sami Nurmi, Olli Taanila, Tomo Takahashi
    • Journal Title

      JCAP 1004

      Pages: 009

  • [Journal Article] Neutrino mass from cosmology : Impact of high-accuracy measurement of the Hubble constant2010

    • Author(s)
      Toyokazu Sekiguchi, Kazuhide Ichikawa, Tomo Takahashi, Lincoln Greenhill
    • Journal Title

      JCAP 1003

      Pages: 015

  • [Journal Article] Cosmology with Long-Lived Charged Massive Particles2010

    • Author(s)
      Kazunori Kohri, Tomo Takahashi
    • Journal Title

      Phys.Lett.B 682

      Pages: 337

  • [Journal Article] Density Fluctuations in Thermal Inflation and Non-Gaussianity2009

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

      JCAP 0912

      Pages: 012

  • [Journal Article] Eect of Background Evolution on the Curvaton Non-Gaussianity2009

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

      JCAP 0912

      Pages: 001

  • [Journal Article] Primordial Non-Gaussianity in Models with Dark Matter Isocurvature Fluctuations2009

    • Author(s)
      Tomo Takahashi, Masahide Yamaguchi, Shuichiro Yokoyama
    • Journal Title

      Phys.Rev.D 80

      Pages: 063524

  • [Journal Article] The Subdominant Curvaton2009

    • Author(s)
      Kari Enqvist, Sami Nurmi, Gerasimos Rigopoulos, Olli Taanila, Tomo Takahashi
    • Journal Title

      JCAP 0911

      Pages: 003

  • [Journal Article] Constraining Light Gravitino Mass from Cosmic Microwave Background2009

    • Author(s)
      Kazuhide Ichikawa, Masahiro Kawasaki, Kazunori Nakayama, Toyokazu Sekiguchi, Tomo Takahashi
    • Journal Title

      JCAP 0908

      Pages: 013

  • [Journal Article] Gravitino Dark Matter and Non-Gaussianity2009

    • Author(s)
      Tomo Takahashi, Masahide Yamaguchi, Jun-ichi Yokoyama, Shuichiro Yokoyama
    • Journal Title

      Phys.Lett.B 678

      Pages: 15

  • [Journal Article] Limits on Isocurvature Perturbations from Non-Gaussianity in WMAP Temperature Anisotropy2009

    • Author(s)
      Chiaki Hikage, Kazuya Koyama, Takahiko Matsubara, Tomo Takahashi, Masahide Yamaguchi
    • Journal Title

      Mon.Not.Roy.Astron.Soc. 398

      Pages: 2188

  • [Journal Article] Constraints on Neutrino Masses from Weak Lensing2009

    • Author(s)
      Kiyotomo Ichiki, Masahiro Takada, Tomo Takahashi
    • Journal Title

      Phys.Rev.D 79

      Pages: 023520

  • [Journal Article] Non-Gaussianity and Baryonic Isocurvature Fluctuations in the Curvaton Scenario2009

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

      Phys.Lett.B 671

      Pages: 339

  • [Journal Article] Adiabatic fluctuations from cosmic strings in a contracting universe2009

    • Author(s)
      Robert H.Brandenberger, Tomo Takahashi, Masahide Yamaguchi
    • Journal Title

      JCAP 0907

      Pages: 015

  • [Journal Article] Primordial Curvature Fluctuation and Its Non-Gaussianity in Models with Modulated Reheating2008

    • Author(s)
      Kazuhide Ichikawa, Teruaki Suyama, Tomo Takahashi, Masahide Yamaguchi
    • Journal Title

      Phys.Rev.D 78

      Pages: 063545

  • [Journal Article] Signatures of Non-Gaussianity in the Curvaton Model2008

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

      JCAP 0809

      Pages: 012

  • [Journal Article] Probing the Effective Number of Neutrino Species with Cosmic Microwave Background2008

    • Author(s)
      Kazuhide Ichikawa, Toyokazu Sekiguchi, Tomo Takahashi
    • Journal Title

      Phys.Rev.D 78

      Pages: 083526

  • [Journal Article] Non-Gaussianity, Spectral Index and Tensor Modes in Mixed Inflaton and Curvaton Models2008

    • Author(s)
      Kazuhide Ichikawa, Teruaki Suyama, Tomo Takahashi, Masahide Yamaguchi
    • Journal Title

      Phys.Rev.D 78

      Pages: 023513

  • [Journal Article] Primordial Helium Abundance from CMB : a constraint from recent observations and a forecast2008

    • Author(s)
      Kazuhide Ichikawa, Toyokazu Sekiguchi, Tomo Takahashi
    • Journal Title

      Phys.Rev.D 78

      Pages: 043509

  • [Journal Article] The Hubble Constant and Dark Energy from Cosmological Distance Measures2008

    • Author(s)
      Kazuhide Ichikawa, Tomo Takahashi
    • Journal Title

      JCAP 0804

      Pages: 027

  • [Journal Article] Constraints on Generalized Dark Energy from Recent Observations2007

    • Author(s)
      Kiyotomo Ichiki, Tomo Takahashi
    • Journal Title

      Phys.Rev.D 75

      Pages: 123002

  • [Presentation] Scale-dependence of Non-Gaussianity2011

    • Author(s)
      Tomo Takahashi
    • Organizer
      Molecule-type Workshop "Cosmological Perturbation and Cosmic Microwave Background," YITP
    • Place of Presentation
      Kyoto University
    • Year and Date
      2011-03-23
  • [Presentation] Scale-dependence of non-Gaussianity as a probe of the early Universe2010

    • Author(s)
      Tomo Takahashi
    • Organizer
      Extra-Dimension Probe by Cosmophysics
    • Place of Presentation
      KEK, Tsukuba
    • Year and Date
      2010-11-08
  • [Presentation] Classifying models of large (local-type) non-Gaussianity2010

    • Author(s)
      Tomo Takahashi
    • Organizer
      Cosmo 2010
    • Place of Presentation
      University of Tokyo
    • Year and Date
      2010-09-28
  • [Presentation] Cosmological Aspects of Long-Lived Charged Massive Particles2010

    • Author(s)
      Tomo Takahashi
    • Organizer
      Planck 2010
    • Place of Presentation
      CERN
    • Year and Date
      2010-06-02
  • [Presentation] Bispectrum and Trispectrum in models with large Non-Gaussianity2010

    • Author(s)
      Tomo Takahashi
    • Organizer
      Workshop "The non-Gaussian Universe," YITP
    • Place of Presentation
      Kyoto University, Japan
    • Year and Date
      2010-03-25
  • [Presentation] Gravitino Dark Matter and Non-Gaussianity2009

    • Author(s)
      Tomo Takahashi
    • Organizer
      Cosmo-2009
    • Place of Presentation
      CERN, Geneva, Switzerland
    • Year and Date
      20090900
  • [Presentation] Nonlinear cosmological perturbations in models with quintessence2009

    • Author(s)
      Tomo Takahashi
    • Organizer
      IPMU, Dark Energy conference
    • Year and Date
      20090600
  • [Presentation] Non-Gaussianity and Baryogenesis2009

    • Author(s)
      Tomo Takahashi
    • Organizer
      Workshop "Particle Cosmology Institute" CERN
    • Place of Presentation
      Geneva, Switzerland
    • Year and Date
      2009-09-18
  • [Presentation] Non-Gaussianity in Model with Isocurvature Fluctuations and Current Limit2009

    • Author(s)
      Tomo Takahashi
    • Organizer
      Non-linear cosmological perturbations
    • Place of Presentation
      YITP, Kyoto University, Japan
    • Year and Date
      2009-04-23
  • [Presentation] Non-Gaussianity in the Curvaton Scenario2009

    • Author(s)
      Tomo Takahashi
    • Organizer
      Focus week on non-Gaussianity in the sky, IPMU
    • Place of Presentation
      University of Tokyo, Kashiwa, Japan
    • Year and Date
      2009-04-09
  • [Presentation] Non-Gaussianity in the Curvaton Scenario2008

    • Author(s)
      Tomo Takahashi
    • Organizer
      The 18th workshop on General Relativity and Gravitation in Japan
    • Place of Presentation
      Hiroshima University, Higashi-Hiroshima, Japan
    • Year and Date
      2008-11-18
  • [Presentation] Free streaming and non-thermally produced dark matter2007

    • Author(s)
      Tomo Takahashi
    • Organizer
      International Conference on Particle Physics and Cosmology (COSMO-07)
    • Place of Presentation
      Sussex University, UK
    • Year and Date
      2007-08-22
  • [Presentation] Dark Side of the Universe2007

    • Author(s)
      高橋智
    • Organizer
      基研研究会「弦理論と場の理論-量子と時空の最前線」
    • Place of Presentation
      近畿大学
    • Year and Date
      2007-08-08
  • [Presentation] The Nature of Dark Energy and its Implications for Particle Physics and Cosmology2007

    • Author(s)
      高橋智
    • Organizer
      研究会「宇宙初期における時空と物質の進化」
    • Place of Presentation
      東京大学
    • Year and Date
      2007-05-30

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Published: 2012-02-13   Modified: 2016-04-21  

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