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Finite-Range Gravity

Research Project

Project/Area Number 01540309
Research Category

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

Allocation TypeSingle-year Grants
Research Field 物理学一般
Research InstitutionCollege of Arts and Sciences, University of Tokyo

Principal Investigator

FUJII Yasunori  Institute of Physics, College of Arts and Science, Professor, 教養学部, 教授 (60012308)

Project Period (FY) 1989 – 1991
Project Status Completed (Fiscal Year 1991)
Budget Amount *help
¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1991: ¥200,000 (Direct Cost: ¥200,000)
Fiscal Year 1990: ¥300,000 (Direct Cost: ¥300,000)
KeywordsFifth force / Csomological constant / Laser interferometor / Scalar Field / レ-ザ-干渉計 / 重力波 / 宇宙項 / インフレ-ション / 重力
Research Abstract

Around 1989 when this project started, some questions were being raised of the geophysical experiments which had been accepted as an evidence for finite-range gravity, known also as a fifth force. It was eventually concluded in 1990 that no firm evidence was available. In the occasion of SLxth Marcel Grossmann Meeting on General Relativity held in 1991, for example, an agreement was reached that experiments give only upper bounds on the value of alpha which represents the relative strength of the fifth force. It seemed that no essentially new experiments were in sight. On the other hand, the detailed reevaluation of the theoretical models presented so far revealed that the predictions on the value of a as well as the forcerange are subject to uncertainties within- a few orders of magnitude. At the same time the naturalness of the theoretical motivations is even more obvious ; experiments of better accuracy are highly encouraged. In view of this situation, we carried out the project in … More the two directions.
1. Assuming that the fifth force is mediated by a scalar field, we investigated its roles from a wider point of view. We focused particularly on the connection with the cosmological constant problem in cosmology. Its importance is highly emphasized in the program of unifying particle physics and gravitation. It was pointed out that due to a scalar field -coupled nonmift-imally tolravity the cosmological constant can "decay" in time. A detailed analysis has shown that t ls is a very promising approach. We reached to a point in which we have a better understanding of the mechanism of reheating the universe, though it is yet to be seen how we explain the density perturbation equally successfully.
2. As an experiment to search for the finite-range gravity in still higher accuracy, we proposed to use a ultra-sensitive laser interferometer which is now being developed in the program of gravity-wave detection. We believe that a further progress can be achieved by utilizing the technique of lasers with extremely narrow line width. Less

Report

(4 results)
  • 1991 Annual Research Report   Final Research Report Summary
  • 1990 Annual Research Report
  • 1989 Annual Research Report
  • Research Products

    (16 results)

All Other

All Publications (16 results)

  • [Publications] Yarunori Fujii and Tsuyoshi Nishioka: "Model of a Decaying Cosmological Constant" Physical Review D. 42. 361-370 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Yarunori Fujii and Tsuyoshi Nishioka: "Reconciling a Small Density Parameter to Inflation" Physics Letters B. 254. 347-354 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Yasunori Fujii: "Locally Varying Partical Masses due to a Scalar Fifth-Force Field" Physics Letters B. 255. 439-444 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Yasunori Fujii: "The Theoretical Background of the Fifth Force" International Journal of Medern Physics A. 6. 3505-3557 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Tsuyoshi Nishioka and Yasushi Fujii: "Inflation and the Decaying Cosmological Constant" Physical Revies D. 45. (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Yasunori Fujii and Tsuyoshi Nishioka.: "Model of a Decaying Cosmological Constant," Physical Review. D42. 361-370 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Yasunori Fujii and Tsuyoshi Nishioka.: "Reconciling a Small Density Parameter to Inflation" Physics Letters. B254. 347-354 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Yasunori Fujii: "Locally Varying Particle Masses due to a Scalar Fifth-Force Field" Physics Letters. B255. 439-444 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Yasunori Fujii: "The Theoretical Background of the Fifth Force" International Journal of Modern Physics. A6. 3505-3557 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Tsuyoshi Nishioka and Yasunori Fujii: "Inflation and the Decaying Cosmological Constant" Physical Review. D45. (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Tsuyoshi Nishioka and Yasunori Fujii: "Inflation and the Decaying Cosmological Constant" Physical Review D. 45. (1992)

    • Related Report
      1991 Annual Research Report
  • [Publications] Yasunori Fujii and Tsuyoshi Nishioka: "Model of a Decaying Cosmological Constant" Physical Review D. 42. 361-370 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] Yasunori Fujii and Tsuyoshi Nishioka: "Reconciling a Small Density Parameter to Inflation" Physics Letters B. 254. 347-354 (1991)

    • Related Report
      1990 Annual Research Report
  • [Publications] Yasunori Fujii: "Locally Varying Particle Masses due to a Scalar FifthーForce Field" 255. 439-444 (1991)

    • Related Report
      1990 Annual Research Report
  • [Publications] Yasunori Fujii: "Theoretical Background of the Fifth Force" International Journal of Modern Physics A.

    • Related Report
      1990 Annual Research Report
  • [Publications] Y.FUJII: "Can the fifth force be less composition-dependent?" Proc.XXIVth Rencontre de Moriond“Tests of Fundamental Laws in Physics"(Editions Frontie^`res). 589-594 (1989)

    • Related Report
      1989 Annual Research Report

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Published: 1990-04-01   Modified: 2016-04-21  

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