• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

INVESTIGATION OF EARY UNIVERSE BASED ON UNIFIED THEORIES

Research Project

Project/Area Number 08640341
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 素粒子・核・宇宙線
Research InstitutionTOHOKU UNIVERSITY

Principal Investigator

YOSHIMURA Motohiko  TOHOKU UNIVERSITY,DEPARTMENT OF PHYSICS,PROFESSOR, 大学院・理学研究科, 教授 (70108447)

Project Period (FY) 1996 – 1998
Project Status Completed (Fiscal Year 1998)
Budget Amount *help
¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 1998: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1997: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1996: ¥800,000 (Direct Cost: ¥800,000)
KeywordsCOSMOLOGY / DARK MATTER / RELIC ABUNDANCE / INFLUENCE FUNCTIONAL / BOLTZMANN EQUATION / GIBBS FORMULA / WIMP / LSP / バリオン非対称 / 対消滅の凍結 / 量子散逸 / 粒子崩壊 / 宇宙初期 / 宇宙初期現象 / インフレーション / パラメータ共鳴
Research Abstract

In most previous study of physical cosrnology effect of cosmic environment has been evaluated by using the Boltzmann equation suitably averaged in thermal medium. This approach is based on the on-shell S-matrix element, tire transition matrix element between the infinite past and the h6 : rite future, 'and neglects subtle quantum mechanical correlation at 6nite intermediate times of the on-going process. In the present investigation a fully quantum mechanical approach is adopted, using the in influence functional method. In particular, pair annihilation of heavy stable particle that occurs in the early universe was investigated, and quantum kinetic equation for the momentum distribution of the annihilating particle has been derived.
A crossing symmetric Hartree approximation that determines self-consistently the equilibrium distribution is developed, and its Markovian approximation is shown to generalize the Boltzmann equation, including off-shell effects. The off-shell effect is dominant at low temperatures. The deck changes the equilibrium distribution from the familiar 1/(e^<omegamu/gamma>-1) modified one given by a Gibbs formula. Integrated over momenta, tire particle number density becomes roughly of order (coupling) * ROO<T/M>・T^3 at low 'temperatures for the S-wave annihilation. The relic mass density in the present universe is insensitive the coupling strength in a large range of the mass and the coupling parameters, and scales with the VAMP mass as <approximately equal> 6*10^4eVcm^<-3>(M/geV)^<4/3>

Report

(4 results)
  • 1998 Annual Research Report   Final Research Report Summary
  • 1997 Annual Research Report
  • 1996 Annual Research Report
  • Research Products

    (20 results)

All Other

All Publications (20 results)

  • [Publications] I.JOICHI: "TIME EVOLUTION OF UNSTABLE PARTICLE DECAY SEEN WITH FINITE RESOLUTION" PHYSICAL REVIEV. D58. 045004-12 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] M.YOSHIMURA: "PROLONGED DECOUPLING" PROCEEDINGS OF 3RD RESCU SYNPOSIUM ON “PARTICCE COSMOLOGY". 21-32 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] I.JOICHI: "PROLONGED DECAY AND CP-ASYINMETRY" PHYSICAL REVIEW. D58. 043507-17 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Sh.Matsumoto: "Relic Abundauce due to Cosmic Pair Annihilation" TU/98/554, RCNS-98-16, and hep-ph/9809585. (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Sh.Matsumoto: "Quantum Kinetic Equation and Cosmic Pair Annihilation" Phy.Rev.D59. in press. (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] I.Joichi, Sh.Matsumoto and M.Yoshimura: "Time Evolution of Unstable Particle Decay Seen with Finite Resolution" Phys.Rev.D58. 045004-12 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] M.Yoshimura: "Prolonged Decoupling" in the Proceedings of 3rd RESCU Symposium on "Particle Cosmology", (Universal Academy Press, Tokyo). hep-ph/9801423

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] I.Joichi, Sh.Matsumoto and M.Yoshimura: "Prolonged Decay and CP-asymmetry" Phys.Rev.D58. 043507-17 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Sh.Matsumoto and M.Yoshimura: "Relic Abundance due to Cosmic Pair Annihilation" TU/98/554, RCNS-98-16. hep-ph/9809585

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Sh.Matsumoto and M.Yoshimura: "Quantum Kinetic Equation and Cosmic Pair Annihilation" Phys.Rev.D59, (in press). hep-ph/9811301 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] I,JOICHI: "TIME EVOLUTION OF UNSTABLE PARTICLE DECAY SEEN WITH FINITE RESOLUTION" PHYSICAL REVIEW. D58. 045004-045012 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] M,YOSHIMURA: "PROLONGED DECPUPLING" PROCEEDINGS OF 3RD RESCU SYMPOSIUM ON “PARTICLE COSMOLOGY". 21-32 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] I,JOICHI: "PROLONGED DECAY AND CP-ASYMMETRY" PHYSICAL REVIEW. D58. 043507-043517 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] I.JOICHI: "QUANTOM DISSIPATION AND DECAY IN MEDIUM" PHYSICAL REVIEW A. A57. 798-805 (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] M.HOTTA: "QUANTUM SYSTEM UNDER PERIODIC PERTURBATION : EFFECT OF ENVIROWMENT" PHYSICAL REVIEW D. D55. 4614-4639 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] I.JOICHI: "QUANTUM DISSIPATION IN OPEN HARMONIC SYSTEM -OPERATOR SOLUTION AND APPLICATION TO DECAYPROCESS-" PROGRESS OF THEORETICAL PHYSICS. 98. 9-28 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] H.Fujisaki: "PARTICLE PRODUCTION AND DISSIPATIVE COSMIC FIELD" Physical Review D. D53. 6805-6812 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] H.FUJISAKI: "PARTICLE PRODUCTION AND GRAVITINO ABUNDANCE AFTER INFLATION" PHYSICAL REVIEW D. D54. 2494-2503 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] M.YOSHIMURA: "BARYOGENESIS AND THERMAL HISTORY AFTER INFLATION" JOURNAL OF KOREAN PHYSICAL SOCIETY. 29. S236 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] M.HOTTA: "QUANTUM SYSTEM UNDER PERIODIC PERTURBATION : EFFECT OF ENVIRONMENT" PHYSICAL REVIEW D. (予定).

    • Related Report
      1996 Annual Research Report

URL: 

Published: 1996-04-01   Modified: 2016-04-21  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi