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2008 Fiscal Year Final Research Report

Roles of topological defects in the evolution of the universe

Research Project

  • PDF
Project/Area Number 18740157
Research Category

Grant-in-Aid for Young Scientists (B)

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

Principal Investigator

YAMAGUCHI Masahide  Aoyama Gakuin University, 理工学部, 准教授 (80383511)

Project Period (FY) 2006 – 2007
Keywords宇宙物理
Research Abstract

これまで行われてきたコスミックストリングの研究のほぼ全て、テンションは時間に依らないと仮定されてきた。しかしながら、振動する場との結合がある場合やブレインワールドモデルにおいては、一般にテンションは時間依存性を持つ。この新しいクラスのストリングに初めて着目し、宇宙における進化や構造形成への影響を議論した。また、超紐理論に基づいて提案されている宇宙に収縮時期があったとするシナリオにおいて、これまでの常識を覆し、コスミックストリングが最新の観測によって示唆されている密度揺らぎの性質を説明できる可能性があることを示した。

  • Research Products

    (19 results)

All 2009 2008 2007 2006

All Journal Article (19 results) (of which Peer Reviewed: 19 results)

  • [Journal Article] Extended slow-roll conditions and primordial fluctuations : Multiple scalar fields and generalized gravity2009

    • Author(s)
      Takeshi Chiba and Masahide Yamaguchi
    • Journal Title

      Journal of Cosmology and Astroparticle Physics 0901

      Pages: 1-16

    • Peer Reviewed
  • [Journal Article] Reheating in chaotic D-term inflation2008

    • Author(s)
      Teruhiko Kawano and Masahide Yamaguchi
    • Journal Title

      Physical Review D78 123511

      Pages: 1-5

    • Peer Reviewed
  • [Journal Article] Primordial curvature fluctuation and its non-Gaussianity in models with modulated reheating2008

    • Author(s)
      Kazuhide Ichikawa, Teruaki Suyama, Tomo Takahashi, and Masahide Yamaguchi
    • Journal Title

      Physical Review D78 063545

      Pages: 1-20

    • Peer Reviewed
  • [Journal Article] Extended slow-roll conditions and rapid-roll conditions,2008

    • Author(s)
      Takeshi Chiba and Masahide Yamaguchi
    • Journal Title

      Journal of Cosmology and Astroparticle Physics 0810

      Pages: 1-16

    • Peer Reviewed
  • [Journal Article] Non-Gaussianity, Spectral Index and Tensor Modes in Mixed Inflaton and Curvaton Models2008

    • Author(s)
      K. Ichikawa, T. Suyama, T. Takahashi, Masahide Yamaguchi
    • Journal Title

      Physical Review D78 023513

      Pages: 1-21

    • Peer Reviewed
  • [Journal Article] New D-term chaotic inflation in supergravity and leptogenesis2008

    • Author(s)
      K. Kadota, T. Kawano, and Masahide Yamaguchi
    • Journal Title

      Physical Review D77 123516

      Pages: 1-8

    • Peer Reviewed
  • [Journal Article] DBI-essence2008

    • Author(s)
      J. Martin and Masahide Yamaguchi
    • Journal Title

      Physical Review D77 123508

      Pages: 1-9

    • Peer Reviewed
  • [Journal Article] Formation of intermediate-mass black holes as primordial black holes in the inflationary cosmology with running spectral index2008

    • Author(s)
      T. Kawaguchi, M. Kawasaki, T. Takayama, Masahide Yamaguchi, and J. Yokoyama
    • Journal Title

      Monthly Notices of the Royal Astronomical Society 388

      Pages: 1426-1432

    • Peer Reviewed
  • [Journal Article] Non-Gaussianity in the modulated reheating scenario2008

    • Author(s)
      T. Suyama and Masahide Yamaguchi
    • Journal Title

      Physical Review D77 023505

      Pages: 1-8

    • Peer Reviewed
  • [Journal Article] D-term chaotic inflation in supergravity2007

    • Author(s)
      K. Kadota and Masahide Yamaguchi
    • Journal Title

      Physical Review D76 103522

      Pages: 1-5

    • Peer Reviewed
  • [Journal Article] Effective Search Templates for a Primordial Stochastic Gravitational Wave Background2007

    • Author(s)
      T. Chiba, Y. Himemoto, Masahide Yamaguchi, and J. Yokoyama
    • Journal Title

      Physical Review D76 043156

      Pages: 1-7

    • Peer Reviewed
  • [Journal Article] Warped Leptogenesis with Dirac Neutrino Masses2007

    • Author(s)
      T. Gherghetta, K. Kadota, and Masahide Yamaguchi
    • Journal Title

      Physical Review D76 023516

      Pages: 1-6

    • Peer Reviewed
  • [Journal Article] Axino warm dark matter and Omega_b-Omega_DM coincidence,2007

    • Author(s)
      O. Seto and Masahide Yamaguchi
    • Journal Title

      Physical Review D75 123506

      Pages: 1-7

    • Peer Reviewed
  • [Journal Article] Lepton asymmetry in the primordial gravitational wave spectrum2007

    • Author(s)
      K. Ichiki, Masahide Yamaguchi, and J. Yokoyama
    • Journal Title

      Physical Review D75 084017

      Pages: 1-8

    • Peer Reviewed
  • [Journal Article] Electroweak Baryogenesis with Embedded Domain Walls2007

    • Author(s)
      R. H. Brandenberger, W. Kelly, and Masahide Yamaguchi
    • Journal Title

      Progress of Theoretical Physics 117

      Pages: 823-834

    • Peer Reviewed
  • [Journal Article] Time variation of proton-electron mass ratio and fine structure constant with runaway dilaton2007

    • Author(s)
      T. Chiba, T. Kobayashi, Masahide Yamaguchi, and J. Yokoyama
    • Journal Title

      Physical Review D75 043516

      Pages: 1-10

    • Peer Reviewed
  • [Journal Article] Effects of Cosmic Strings on Free Streaming2006

    • Author(s)
      T. Takahashi and Masahide Yamaguchi
    • Journal Title

      Physical Review D74 063512

      Pages: 1-7

    • Peer Reviewed
  • [Journal Article] Implications of cosmic strings with time-varying tension on CMB and large scale structure2006

    • Author(s)
      K. Ichikawa, T. Takahashi, and Masahide Yamaguchi
    • Journal Title

      Physical Review D74 063526

      Pages: 1-9

    • Peer Reviewed
  • [Journal Article] Power spectrum of the density perturbations from smooth hybrid new inflation model2006

    • Author(s)
      M. Kawasaki, T. Takayama, Masahide Yamaguchi, and J. Yokoyama
    • Journal Title

      Physical Review D74 043525

      Pages: 1-10

    • Peer Reviewed

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Published: 2010-06-10   Modified: 2016-04-21  

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