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2006 Fiscal Year Final Research Report Summary

The evolution of space-time and matters in the very early universe

Research Project

Project/Area Number 14102004
Research Category

Grant-in-Aid for Scientific Research (S)

Allocation TypeSingle-year Grants
Research Field 素粒子・核・宇宙線
Research InstitutionThe University of Tokyo

Principal Investigator

SATO Katsuhiko  The University of Tokyo, Graduate school of Science, Professor (00111914)

Co-Investigator(Kenkyū-buntansha) SUTO Yasushi  The University of Tokyo, Graduate school of Science, Professor (20206569)
SASAKI Misao  Kyoto University, Yukawa Institute for Theoretical Physics, Professor (70162386)
KAWASAKI Masahiro  The University of Tokyo, The Institute for Cosmic Ray Research, Professor (50202031)
SHIROMIZU Tetsuya  Tokyo Institute of Technology, Graduate school of Science, Associate Professor (10282716)
TARUYA Atsushi  The University of Tokyo, Graduate school of Science, Research Assosiate (40334239)
Project Period (FY) 2002 – 2006
KeywordsCosmology / Supernova / Cosmic ray / Gravitational theory / Particle cosmology
Research Abstract

1. We proposed the delta-N formalism to treat the non-linear fluctuations at super-Hubble horizon scale. This provides us the powerful tool to link the very early universe to observational quantities. This formalism is often used by many peoples who are interested in the non-linear effects in cosmology.
2. We proved the uniqueness theorem of static, asymptotically flat black holes in higher dimensions. While there is the Hawking's topology theorem in four dimensions, that is, the topology of event horizon is 2-sphere, this is not the case in higher dimensions. However, our new theorem implies that static black holes have topology of sphere.
3. The genesis of Lepton, i. e., Leptogenesis, is most promising mechanism to explain the baryon number observed today. In this mechanism, we proposed a new model which explains the baryon number by the sign of the CP-violation in neutrino oscillations.
4. We explored the gravitino decay process during the Big-bang nucleosynthesis and then had the limi … More t to the hadronic decay. This result provides us a strong limit on inflation models and baryogenesis.
5. We investigated the evaporation of primordial black holes (PBH) formed in braneworld context. More precisely, using the observational limit on the gamma ray background and the abundance of anti-protons, we could have the limit on the abundance of PBH, the size of extra dimensions and so on.
6. With high-resolution N-body simulations, we constructed the triaxial modeling halo density profiles empirically. Then we could explain the observed gravitational arc statistics with this model. This is first time to explain that.
7. With Sloan Digital Sky Survey (SDSS) data we found that the evolution of non-Gaussian feature of probability distribution function (PDF) depends on the class of galaxies. Since we could pick up the secondary cause of the appearance of non-Gaussianity through the evolution of galaxy, we could have the basics to explore the initial condition for the density fluctuations. Less

  • Research Products

    (13 results)

All 2008 2007 2006 2005 2003 2002

All Journal Article (11 results) Book (2 results)

  • [Journal Article] Inflationary fluctuation in the R-S cosmology : limits on blue spectra2006

    • Author(s)
      Y. Sendouda, S. Nagataki, K. Sato
    • Journal Title

      Jounal of Cosmology and Astroparticle Physics 6

      Pages: 003

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Big-bang nucleosynthesis and hadronic decay of long-lived massive particles2005

    • Author(s)
      M. Kawasaki, K. Kohri, T. Moroi
    • Journal Title

      Physical Review D 71

      Pages: 083502

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] A general proof of the conservation of the curvature perturbation2005

    • Author(s)
      D. H. Lyth, K. A. Malik, M. Sasaki
    • Journal Title

      Journal of Cosmology and Astroparticle Physics 05

      Pages: 004

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Low energy effective theory for two branes system2003

    • Author(s)
      T. Shiromizu, K. Koyama
    • Journal Title

      Physical Review D 67

      Pages: 084022

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Non-Gaussian tails of cosmological density distribution function from dark halo approach2003

    • Author(s)
      A. Taruya, T. Hamana, I. Kayo
    • Journal Title

      Monthly Notice of the Royal Astronomical Society 339

      Pages: 495-504

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Uniqueness and non-unique ness of the static black holes in higher dimensions2002

    • Author(s)
      G. W. Gibbons, D. Ida, T. Shiromizu
    • Journal Title

      Physical Review Letters 89

      Pages: 041101

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Triaxial Modeling of Halo Density Profiles with High-resolution N-body Simulations2002

    • Author(s)
      Y. P. Jing, Y. Suto
    • Journal Title

      Astrophysical Journal 574

      Pages: 538--553

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Cosmological sign of neutrino CP violation2002

    • Author(s)
      P. H. Frampton, S. L. Glashow, T. Yanagida
    • Journal Title

      physics Letters B 548

      Pages: 119-121

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Uniqueness and non-uniqueness of the static black holes in higher dimensions2002

    • Author(s)
      G. W. Gibbons, D. Ida, T. Shiromizu
    • Journal Title

      Physical Review Letters 89

      Pages: 04110l

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Triaxial Modeling of Halo Density Profiles with High-resolution N'body Simulations2002

    • Author(s)
      Y. P. Jing, Y. Suto
    • Journal Title

      Astrophysical Journal 574

      Pages: 538-553

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Cosmological sign of neutrino CP violation2002

    • Author(s)
      P. H. Frampton, S. L. Glashow, T. Yanagida
    • Journal Title

      Physics Letters B 548

      Pages: 119-121

    • Description
      「研究成果報告書概要(欧文)」より
  • [Book] シリーズ 現代の天文学 II 「宇宙論 I」宇宙のはじまり2008

    • Author(s)
      佐藤, 二間瀬編(佐藤勝彦, 佐々木節, 白水徹也, 川崎雅裕 等著)
    • Total Pages
      246
    • Publisher
      日本評論社
    • Description
      「研究成果報告書概要(和文)」より
  • [Book] シリーズ 現代の天文学II「宇宙論 II」宇宙の進化2007

    • Author(s)
      二間瀬等編(須藤靖 等 著)
    • Total Pages
      250
    • Publisher
      日本評論社
    • Description
      「研究成果報告書概要(和文)」より

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Published: 2010-06-09  

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