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

2013 Fiscal Year Final Research Report

Non-linear evolution of density fluctuations in numerical cosmology

Research Project

  • PDF
Project/Area Number 23740186
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Particle/Nuclear/Cosmic ray/Astro physics
Research InstitutionKyoto University

Principal Investigator

HIRAMATSU Takashi  京都大学, 基礎物理学研究所, 特定研究員 (50456175)

Project Period (FY) 2011 – 2013
Keywords宇宙論 / 密度揺らぎ / 宇宙論的位相欠陥 / 宇宙論的摂動論 / 宇宙紐 / 修正重力理論 / 数値宇宙論
Research Abstract

As a first step of establishing the foundations of Numerical Cosmology, we developed a general-purpose three-dimensional hyperbolic equation solver for classical field theory, and studied the non-linear evolution of primordial density fluctuations and the topological defects appeared as a result of phase transition of the vacuum states. As for the latter project, we addressed a variety of issues lying across cosmology by virtue of the ubiquitous property of Numerical Cosmology, from the gravitational waves and axions from domain walls, to the dynamical constraints on the model building of supersymmetric models from the colliding meta-stable strings. In addition, we developed a Boltzmann solver for the photons in the early Universe to impose the initial conditions of the density fluctuations. As for the modified gravity theories, we investigated the details of the scalar gravity hidden in the theories, and the possibility of the observational constraints on their theoretical parameters.

  • Research Products

    (10 results)

All 2014 2013 2012 2011

All Journal Article (7 results) (of which Peer Reviewed: 7 results) Presentation (3 results)

  • [Journal Article] Beyond consistency test of gravity with redshift-space distortions at quasi-linear scales2014

    • Author(s)
      樽家 篤史、小山 和哉、平松 尚志、岡 アキラ
    • Journal Title

      Physical Review D

      Volume: 89 Pages: 043509

    • DOI

      10.1103/PhysRevD.89.043509

    • Peer Reviewed
  • [Journal Article] On the estimation of gravitational wave spectrum from cosmic domain walls2014

    • Author(s)
      平松 尚志、川崎 雅裕、齋川 賢一
    • Journal Title

      Journal of Cosmology and Astroparticle Physics

      Volume: 1402 Pages: 031

    • DOI

      10.1088/1475-7516/2014/02/031

    • Peer Reviewed
  • [Journal Article] Instability of colliding metastable strings2014

    • Author(s)
      平松 尚志、衛藤 稔、鎌田 耕平、小林 達夫、大河内 豊
    • Journal Title

      Journal of Hieh Energy Physics

      Volume: 01 Pages: 165

    • DOI

      10.1007/JHEP01(2014)165

    • Peer Reviewed
  • [Journal Article] Type-I cosmic string network2013

    • Author(s)
      平松 尚志、仙洞田 雄一、高橋 慶太郎、山内 大介、柳 哲文
    • Journal Title

      Physical Review D

      Volume: 88 Pages: 085021

    • DOI

      10.1103/PhysRevD.88.085021

    • Peer Reviewed
  • [Journal Article] Equivalence Principle Violation in Vainshtein Screened Two-Body Systems2013

    • Author(s)
      平松 尚志、Wayne Hu、小山 和哉、Fabian Schmidt
    • Journal Title

      Physical Review D

      Volume: 87 Pages: 063525

    • DOI

      10.1103/PhysRevD.87.063525

    • Peer Reviewed
  • [Journal Article] Axion cosmology with long-lived domain walls2013

    • Author(s)
      平松 尚志、川崎 雅裕、齋川 賢一、関口豊和
    • Journal Title

      Journal of Cosmology and Astroparticle Physics

      Volume: 1301 Pages: 001

    • DOI

      10.1088/1475-7516/2013/01/001

    • Peer Reviewed
  • [Journal Article] Production of dark matter axion from collapse of string-wall systems2012

    • Author(s)
      平松 尚志、川崎 雅裕、齋川 賢一、関口豊和
    • Journal Title

      Physical Review D

      Volume: 85 Pages: 105020

    • DOI

      10.1103/PhysRevD.85.105020

    • Peer Reviewed
  • [Presentation] Instability of colliding metastable strings2013

    • Author(s)
      平松 尚志
    • Organizer
      日本物理学会秋季大会
    • Place of Presentation
      高知大学
    • Year and Date
      20130920-23
  • [Presentation] Type-I cosmic string network2012

    • Author(s)
      平松 尚志
    • Organizer
      日本物理学会秋季大会
    • Place of Presentation
      京都産業大学
    • Year and Date
      20120911-14
  • [Presentation] On theVainshtein mechanism for two body system in DGP model2011

    • Author(s)
      平松 尚志
    • Organizer
      COSMO11
    • Place of Presentation
      ポルト大学(ポルトガル)
    • Year and Date
      2011-08-22

URL: 

Published: 2015-06-25  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi