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The role of neutrinos in large scale structure of the universe and the determination of their masses

Research Project

Project/Area Number 21740177
Research Category

Grant-in-Aid for Young Scientists (B)

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

Principal Investigator

ICHIKI Kiyotomo  Nagoya University, 大学院・理学研究科, 助教 (10534480)

Project Period (FY) 2009 – 2010
Project Status Completed (Fiscal Year 2010)
Budget Amount *help
¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2010: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2009: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Keywords宇宙論 / 構造形成 / ニュートリノ / 宇宙物理
Research Abstract

We study the spherical, top-hat collapse model for a mixed dark matter model including cold dark matter (CDM) and massive neutrinos. By propely solving the Boltzmann equations for neutrino perturbations, we find that the neutrino cannot catch up with the nonlinaer evolution of CDM plus baryon perturbations due to its large free-streaming velocity, and consequently slow down the top-hat collapse up to most massive cluster scales. Our finding of the spherical collapse model suggests that, when the initial density fluctuations are normalized to the cosmic microwave background anisotropies, the presence of massive neutrinos decreases the expected present-day abudance of massive clusters with virial masses 10^15M〓 by more than about 20%.

Report

(3 results)
  • 2010 Annual Research Report   Final Research Report ( PDF )
  • 2009 Annual Research Report
  • Research Products

    (23 results)

All 2011 2010 2009 Other

All Journal Article (13 results) (of which Peer Reviewed: 13 results) Presentation (9 results) Remarks (1 results)

  • [Journal Article] Cosmic microwave background bispectrum of vector modes induced from primordial magnetic fields2011

    • Author(s)
      Shiraishi, M., Yokoyama, S., Nitta, D., Ichiki, K., Takahashi, K.
    • Journal Title

      Physical Review D

      Volume: 82

    • Related Report
      2010 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Probing early cosmic magnetic fields through pair echoes from high-redshift GRBs2011

    • Author(s)
      Takahashi, K., Inoue, S., Ichiki, K., Nakamura, T.
    • Journal Title

      Monthly Notices of the Royal Astronomical Society

      Volume: 410 Pages: 2741-2748

    • Related Report
      2010 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Constraints on the neutrino mass and the primordial magnetic field from the matter density fluctuation parameter sigma82010

    • Author(s)
      D.G.Yamazaki, K.Ichiki, T.Kajino, G.J.Mathews
    • Journal Title

      Physical Review D 81,10519

      Pages: 1-5

    • Related Report
      2010 Final Research Report
    • Peer Reviewed
  • [Journal Article] Cosmic discordance : Detection of a modulation in the primordial fluctuation spectrum2010

    • Author(s)
      Ichiki, K., Nagata, R., Yokoyama, J.
    • Journal Title

      Physical Review D

      Volume: 81

    • Related Report
      2010 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Ghost dark matter2010

    • Author(s)
      Furukawa, T., Yokoyama, S., Ichiki, K., Sugiyama, N., Mukohyama, S.
    • Journal Title

      Journal of Cosmology and Astroparticle Physics

      Volume: 5

    • Related Report
      2010 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Constraints on the neutrino mass and the primordial magnetic field from the matter density fluctuation parameter σ_82010

    • Author(s)
      Yamazaki, D.G., Ichiki, K., Kajino, T., Mathews, G.J.
    • Journal Title

      Physical Review D

      Volume: 81

    • Related Report
      2010 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Constraints on primordial non-Gaussianity from galaxy-CMB lensing cross correlation2010

    • Author(s)
      Takeuchi, Y., Ichiki, K., Matsubara, T.
    • Journal Title

      Physical Review D

      Volume: 82

    • Related Report
      2010 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Analytic formulae of the CMB bispectra generated from non-Gaussianity in the tensor and vector perturbations2010

    • Author(s)
      Shiraishi, M., Yokoyama, S., Nitta, D., Ichiki, K., Takahashi, K.
    • Journal Title

      Physical Review D

      Volume: 82

    • Related Report
      2010 Annual Research Report
    • Peer Reviewed
  • [Journal Article] New constraints on the primordial magnetic field2010

    • Author(s)
      D.G.Yamazaki, K.Ichiki, T.Kajino, G.J.Mathews
    • Journal Title

      Physical Review D 81

      Pages: 0230081-7

    • Related Report
      2009 Annual Research Report
    • Peer Reviewed
  • [Journal Article] A Brute force reconstructin of the primordial fluctuation spectrum from five-year Wilkinson Microwave Anisotropy Probe observations2009

    • Author(s)
      K.Ichiki, R.Nagata
    • Journal Title

      Physical Review D 80,083002

      Pages: 1-8

    • Related Report
      2010 Final Research Report
    • Peer Reviewed
  • [Journal Article] Constraints on neutrino masses from WMAP5 and BBN in the lepton asymmetric universe2009

    • Author(s)
      M.Shiraishi, K.Ichikawa, K.Ichiki, N.Sugiyama, M.Yamaguchi
    • Journal Title

      Journal of Cosmology and Astroparticle physics 7,005

      Pages: 1-17

    • Related Report
      2010 Final Research Report
    • Peer Reviewed
  • [Journal Article] Constraints on neutrino masses from WMAP5 and BBN in the lepton a symmetric universe2009

    • Author(s)
      M.Shiraishi, K.Ichikawa, K.Ichiki, N.Sugiyama, M.Yamaguchi
    • Journal Title

      Journal of Cosmology and Astroparticle physics 7

      Pages: 0051-17

    • Related Report
      2009 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Brute force reconstruction of the primordial fluctuation spectrum from five-year Wilkinson Microwave Anisotropy Probe observations2009

    • Author(s)
      K.Ichiki, R.Nagata
    • Journal Title

      Physical Review D 80

      Pages: 0830021-8

    • Related Report
      2009 Annual Research Report
    • Peer Reviewed
  • [Presentation] Weak lensing and Massive Neutrinos2010

    • Author(s)
      Kiyotomo Ichiki
    • Organizer
      APCTP-Topical Research-Program 2010, From Quarks to the Cosmos
    • Place of Presentation
      APCTP office, Soel, Korea
    • Year and Date
      2010-12-15
    • Related Report
      2010 Annual Research Report
  • [Presentation] A spherical collapse model with massive neutrinos2010

    • Author(s)
      Kiyotomo Ichiki
    • Organizer
      HORIBA INTERNATIONAL CONFERENCE COSMO/CosPA 2010
    • Place of Presentation
      University of Tokyo, Japan
    • Year and Date
      2010-09-30
    • Related Report
      2010 Annual Research Report
  • [Presentation] 宇宙論的球対称重力崩壊におけるニュートリノ質量の効果2010

    • Author(s)
      市來淨與
    • Organizer
      日本天文学会秋季年会
    • Place of Presentation
      金沢大学
    • Year and Date
      2010-09-24
    • Related Report
      2010 Annual Research Report
  • [Presentation] Non linear effects of massive neutrinos and cosmological constraints on their masses2010

    • Author(s)
      Kiyotomo Ichiki
    • Organizer
      38^<th> COSPAR scientific assembly
    • Place of Presentation
      Bremen Exhibition & Conference Center, Bremen, Germany
    • Year and Date
      2010-07-19
    • Related Report
      2010 Annual Research Report
  • [Presentation] 宇宙論的球対称重力崩壊におけるニュートリノ質量の効果2010

    • Author(s)
      市來淨與
    • Organizer
      日本天文学会
    • Place of Presentation
      金沢大学
    • Related Report
      2010 Final Research Report
  • [Presentation] Weak lensing and Massive Neutrinos2010

    • Author(s)
      市來淨與
    • Organizer
      APCTP-Topical Resarch-Program 2010, From Quarks to the Cosmos
    • Place of Presentation
      APCTP office, Soel, Korea
    • Related Report
      2010 Final Research Report
  • [Presentation] A spherical collapse model with massive neutrinos2010

    • Author(s)
      市來淨與
    • Organizer
      HORIBA international conference COSMO/CosPA
    • Place of Presentation
      university of Tokyo
    • Related Report
      2010 Final Research Report
  • [Presentation] A Brute Force Reconstruction of the Primordial Fluctuation Spectrum from Five-Year Wilkinson Microwave Anisotropy Probe Observations2009

    • Author(s)
      市來浄與
    • Organizer
      天文学会
    • Place of Presentation
      山口大学
    • Year and Date
      2009-09-14
    • Related Report
      2009 Annual Research Report
  • [Presentation] Constraints on neutrino masses from weak lensing and future CMB lensing-galaxy correlations2009

    • Author(s)
      K.Ichiki
    • Organizer
      molecule-type workshop for non-linear cosmological perturbations
    • Place of Presentation
      Yukawa Institute
    • Year and Date
      2009-04-23
    • Related Report
      2009 Annual Research Report
  • [Remarks] ホームページ等

    • Related Report
      2010 Final Research Report

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Published: 2009-04-01   Modified: 2016-04-21  

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