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Evolution of Inflationary Universe in Extended Gravitational Theories

Research Project

Project/Area Number 03640345
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 物理学一般
Research InstitutionThe University of Tokyo

Principal Investigator

SATO Katsuhiko  The University of Tokyo, Faculty of Science, Professor, 理学部, 教授 (00111914)

Project Period (FY) 1991 – 1992
Project Status Completed (Fiscal Year 1992)
Budget Amount *help
¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 1992: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1991: ¥1,300,000 (Direct Cost: ¥1,300,000)
KeywordsCosmology / Inflation / Phase Trandition / Early Universe / インフレ-ション / 真空の相転移
Research Abstract

Inflationary Universe model, which was proposed by A. Guth and present researcher independently, is a standard scenario of early universe. This is recognized not only as a consequence of unified theories of elementary interaction, but as an essential step of the creation of universe. This model is also supported by observations. Recently COBE (Cosmic background explorer) discovered the fluctuation of background radiation, and found that the spectrum of the fluctuations is very consistent with the prediction of Inflationary model.
In spite of the success of this model, there is a severe problem whether any inhomogeneous and anisotropic universe can evolve to homogeneous and isotropic universe or not. In this research, we investigated this problem called "Cosmic No-hair Conjecture" by using new formalism of the calculation of general relativity, Regge Calculus. For the homogeneous and anisotropic universe, we found the constraint for the initial condition which evolve to inflationary universe not only for usual exponential expanding universe model, but also for the power law expanding models. However, there still remains problem that Hamiltonian constraint is inconsistent with evolution equations for inhomogeneous models.
We also investigated formation of topological defects in early universe during phase transition, and showed that "texture" give a consistent density fluctuation for structure formation in the Big Bang Model,in particular, the deviation from Gaussian helps the formation of large scale structure.

Report

(3 results)
  • 1992 Annual Research Report   Final Research Report Summary
  • 1991 Annual Research Report
  • Research Products

    (15 results)

All Other

All Publications (15 results)

  • [Publications] N.SUGIYAMA,K.SATO: "Constraints on the Universe Models with the decaying Cosmological Constant from CBR Anisotropies" Astrophys.Journal. 387. 439-442 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Y.YOSHII,K.SATO: "Constraints on the Universe with Decaying Cosmological Constant from Number Count of Faint Galaxies" Astrophys.Journal. 387. 7- 12 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] M.NAGASAWA,K.SATO: "Density Perturbation by Global Textures" Int.Journal of Modern Physics. D1. 427-437 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Y.FURIHATA,K.SATO: "Regge Calculus Model of Bianchi IX" Classical and Quantum Gravity.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] N. Sugiyama and K. Sato: "Constraints on Cosmilogical Models with the Decaying Cosmological Constant from Cosmic Background Radiation Anisotropies" Astrophys. J.387. 439-442 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Y. Yoshii and K. Sato: "Constraints on the Universe with Decaying Cosmological Constant from Number Count of Faint Galaxies" Astrophys. J.387. L7-L12 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] M. Nagasawa and K. Sato: "Density Perturbation by Global Textures" Int. Journal of Modern Physics. D1. 427-437 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Y. Furihata and K. Sato: "Regge Calculus Model of Bianchi IX Inflation" Classical and Quatum Gravity,. (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] N.Sugiyama,K.Sato: "Constraints on the Universe Models with the decaying Cosmological Constant from CBR Anisotropies" Astrophys.Journal. 387. 439-442 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] Y.Yoshii,K.Sato: "Constraints on the Universe with Decaying Cosmological Constant from Number Count of Faint Galaxies" Astrophys.Journal. 387. L7-L12 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] M.Nagasawa,K.Sato: "Density Perturbation by Global Textures" Int.Journal of Modern Physics. D1. 427-437 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] Y.Furihata K.Sato: "Regge Calculus Model of Bionchi IX Inflation" Classical and Quantum Gravity.

    • Related Report
      1992 Annual Research Report
  • [Publications] K.Sato: "Primordial Nucleosynthesis in Inhomogeneons Universe" Physica Scripta. 36. 60-63 (1991)

    • Related Report
      1991 Annual Research Report
  • [Publications] N.Sugiyama: "Constraint on the Universe with Decaying Cosmological Constant From Background Radiation" Astrophysical Journal. (1992)

    • Related Report
      1991 Annual Research Report
  • [Publications] Y.Yoshii: "Decaying Cosmolosical Constant and Constraint from Number Count of Faint Galaxies" Astrophysical Journal Letters. (1992)

    • Related Report
      1991 Annual Research Report

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Published: 1991-04-01   Modified: 2016-04-21  

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