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

Mitigating the effects of galaxy peculiar velocities and gravitational lensing using hydrodynamic simulations

Publicly Offered Research

Project AreaGravitational wave physics and astronomy: Genesis
Project/Area Number 20H04723
Research Category

Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

Allocation TypeSingle-year Grants
Review Section Science and Engineering
Research InstitutionHirosaki University

Principal Investigator

高橋 龍一  弘前大学, 理工学研究科, 准教授 (60413960)

Project Period (FY) 2020-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Fiscal Year 2021: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2020: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Keywords宇宙の大規模構造 / 数値シミュレーション / 理論天文学 / 重力波天文学 / 宇宙膨張 / 銀河の大規模分布
Outline of Research at the Start

2017年、重力波検出器LIGOとVIRGOは連星中性子星合体からの重力波を検出し、距離-赤方偏移関係からハッブル定数を約15%の精度で決定した。ただ大きな不定性として、①母銀河の特異速度と②重力レンズ効果が知られている。①は銀河の特異速度の影響で赤方偏移に不定性が生じる効果、②は重力波が遠方から伝わってくる途中で重力レンズを受けて、振幅が増減する効果である。特にハッブル定数は近傍の連星を使うため、銀河の特異速度①の正確な推定が重要になる。申請者は最新の銀河形成シミュレーション(illustris TNG)を用いて、銀河の空間分布から上記の①と②の不定性を除去する手法を開発する。

Outline of Annual Research Achievements

我々は最新の銀河形成シミュレーション(IllustrisTNG, Nelson+ 2019)を用いて、物質の空間分布から銀河の特異速度の不定性を除去する手法を開発した。TNGは暗黒物質とバリオン(星、ガス、ブラックホール)の重力進化を同時に追っており、星や銀河形成、活動銀河核によるフィードバックも考慮されている。一般に公開されている銀河形成シミュレーションとしては最新のものである。必要な全シミュレーションデータをダウンロードし解析を行なった。
TNGデータには、宇宙大規模構造を再現した立方体(1辺205Mpc/h)内に約200万個の銀河と約300億個の粒子(暗黒物質とバリオン)が分布している。始めに粒子分布の質量ゆらぎのパワースペクトルを求め、実空間&赤方偏移空間共に線形理論と良い一致を示すことを確認した。また同様の計算を銀河分布に対しても行い、良い一致をみた。次に以下の手順で銀河の速度場を推定した。まず、あるスケール(r_s)でならした密度分布を粒子分布から出す。次に流体力学の連続の式を摂動的に解いて、密度場から速度場を導出する。この際、線形理論だけでなく、2次摂動の効果を取り入れたモデルを用いた。より小スケールr_sで平均化すると、非線形領域を扱うため、高次の摂動論が重要になる。また我々は(非線形性が比較的低い)銀河団に属していない銀河をサンプルとして選んだ。我々は銀河の視線方向の特異速度の分布関数(PDF)を求め、元々の分布の標準偏差と、推定した速度場を差し引いたあとの標準偏差を比較し、どの程度標準偏差が減少するか調べた。その結果、r_s=5Mpc/hとしたときに、実空間&赤方偏移空間でそれぞれ約45%&38%、特異速度の標準偏差が減少することを見出した。

Research Progress Status

令和3年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

令和3年度が最終年度であるため、記入しない。

Report

(2 results)
  • 2021 Annual Research Report
  • 2020 Annual Research Report
  • Research Products

    (26 results)

All 2022 2021 2020 Other

All Int'l Joint Research (5 results) Journal Article (11 results) (of which Int'l Joint Research: 10 results,  Peer Reviewed: 11 results,  Open Access: 3 results) Presentation (9 results) (of which Int'l Joint Research: 2 results) Remarks (1 results)

  • [Int'l Joint Research] Sorbonne University(フランス)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] University College London/University of Cambridge/University of Portsmouth(英国)

    • Related Report
      2020 Annual Research Report
  • [Int'l Joint Research] Institut d’Astrophysique de Paris(フランス)

    • Related Report
      2020 Annual Research Report
  • [Int'l Joint Research] Universite de Geneve(スイス)

    • Related Report
      2020 Annual Research Report
  • [Int'l Joint Research] Instituto de Astrofisica de Canarias(スペイン)

    • Related Report
      2020 Annual Research Report
  • [Journal Article] Probing cosmology and gastrophysics with fast radio bursts: cross-correlations of dark matter haloes and cosmic dispersion measures2022

    • Author(s)
      Shirasaki Masato、Takahashi Ryuichi、Osato Ken、Ioka Kunihito
    • Journal Title

      Monthly Notices of the Royal Astronomical Society

      Volume: 512 Issue: 2 Pages: 1730-1750

    • DOI

      10.1093/mnras/stac490

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Cosmological boost factor for dark matter annihilation at redshifts of z=10-100 using the power spectrum approach2021

    • Author(s)
      Takahashi Ryuichi、Kohri Kazunori
    • Journal Title

      Physical Review D

      Volume: 104 Issue: 10 Pages: 1-11

    • DOI

      10.1103/physrevd.104.103518

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Impacts of new small-scale N-body simulations on dark matter annihilations constrained from cosmological 21-cm line observations2021

    • Author(s)
      Hiroshima Nagisa、Kohri Kazunori、Sekiguchi Toyokazu、Takahashi Ryuichi
    • Journal Title

      Physical Review D

      Volume: 104 Issue: 8 Pages: 1-7

    • DOI

      10.1103/physrevd.104.083547

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Statistical modelling of the cosmological dispersion measure2021

    • Author(s)
      Takahashi Ryuichi、Ioka Kunihito、Mori Asuka、Funahashi Koki
    • Journal Title

      Monthly Notices of the Royal Astronomical Society

      Volume: 502 Issue: 2 Pages: 2615-2629

    • DOI

      10.1093/mnras/stab170

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Constraining primordial non-Gaussianity with postreconstructed galaxy bispectrum in redshift space2021

    • Author(s)
      Shirasaki Masato、Sugiyama Naonori S.、Takahashi Ryuichi、Kitaura Francisco-Shu
    • Journal Title

      Physical Review D

      Volume: 103 Issue: 2 Pages: 023506-023506

    • DOI

      10.1103/physrevd.103.023506

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] The weak lensing bispectrum induced by gravity2020

    • Author(s)
      Munshi D、Namikawa T、Kitching T D、McEwen J D、Takahashi R、Bouchet F R、Taruya A、Bose B
    • Journal Title

      Monthly Notices of the Royal Astronomical Society

      Volume: 493 Issue: 3 Pages: 3985-3995

    • DOI

      10.1093/mnras/staa296

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Fitting the Nonlinear Matter Bispectrum by the Halofit Approach2020

    • Author(s)
      Takahashi Ryuichi, Nishimichi Takahiro, Namikawa Toshiya, Taruya Atsushi, Kayo Issha, Osato Ken, Kobayashi Yosuke, Shirasaki Masato
    • Journal Title

      The Astrophysical Journal

      Volume: 895 Issue: 2 Pages: 113-113

    • DOI

      10.3847/1538-4357/ab908d

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Probing Dark Low-mass Halos and Primordial Black Holes with Frequency-dependent Gravitational Lensing Dispersions of Gravitational Waves2020

    • Author(s)
      Oguri Masamune、Takahashi Ryuichi
    • Journal Title

      The Astrophysical Journal

      Volume: 901 Issue: 1 Pages: 58-58

    • DOI

      10.3847/1538-4357/abafab

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Accurate emulator for the redshift-space power spectrum of dark matter halos and its application to galaxy power spectrum2020

    • Author(s)
      Kobayashi Yosuke、Nishimichi Takahiro、Takada Masahiro、Takahashi Ryuichi、Osato Ken
    • Journal Title

      Physical Review D

      Volume: 102 Issue: 6 Pages: 063504-063504

    • DOI

      10.1103/physrevd.102.063504

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Covariance of the redshift-space matter power spectrum after reconstruction2020

    • Author(s)
      C. Hikage, R. Takahashi, K. Koyama
    • Journal Title

      Physical Review D

      Volume: 102 Issue: 8 Pages: 083514-083514

    • DOI

      10.1103/physrevd.102.083514

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Power spectrum of halo intrinsic alignments in simulations2020

    • Author(s)
      Kurita Toshiki、Takada Masahiro、Nishimichi Takahiro、Takahashi Ryuichi、Osato Ken、Kobayashi Yosuke
    • Journal Title

      Monthly Notices of the Royal Astronomical Society

      Volume: 501 Issue: 1 Pages: 833-852

    • DOI

      10.1093/mnras/staa3625

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] Cosmological boost factor for dark matter annihilation at redshifts of z=10-100 using the power spectrum approach2022

    • Author(s)
      Ryuichi Takahashi
    • Organizer
      学術変革「ダークマター」シンポジウム
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Statistical modelling of the cosmological dispersion measure2021

    • Author(s)
      Ryuichi Takahashi
    • Organizer
      FRB2021
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Cosmological boost factor for dark matter annihilation at redshifts of z=10-100 using the power spectrum approach2021

    • Author(s)
      Ryuichi Takahashi
    • Organizer
      日本物理学会 秋季大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 高赤方偏移(z=10-100)での暗黒物質の対消滅のブーストファクター2021

    • Author(s)
      Ryuichi Takahashi
    • Organizer
      観測的宇宙論ワークショップ
    • Related Report
      2021 Annual Research Report
  • [Presentation] Recent studies on the propagation velocity of lensed gravitational waves2021

    • Author(s)
      Ryuichi Takahashi
    • Organizer
      Time-Domain Cosmology with Strong Gravitational Lensing
    • Related Report
      2020 Annual Research Report
  • [Presentation] Statistical modelling of the cosmological dispersion measure2021

    • Author(s)
      Ryuichi Takahashi
    • Organizer
      Fast Radio Bursts: A Mystery Being Solved?
    • Related Report
      2020 Annual Research Report
  • [Presentation] 高赤方偏移(z>=10)での暗黒物質の対消滅のブーストファクターの計算2021

    • Author(s)
      Ryuichi Takahashi
    • Organizer
      日本天文学会 春季大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] Modeling the statistics of cosmological dispersion measure with the IllustrisTNG simulations2020

    • Author(s)
      Ryuichi Takahashi
    • Organizer
      日本天文学会 秋季大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] Statistical modelling of the cosmological dispersion measure2020

    • Author(s)
      Ryuichi Takahashi
    • Organizer
      観測的宇宙論ワークショップ
    • Related Report
      2020 Annual Research Report
  • [Remarks] Numerical Codes

    • URL

      http://cosmo.phys.hirosaki-u.ac.jp/takahasi/codes_e.htm

    • Related Report
      2021 Annual Research Report 2020 Annual Research Report

URL: 

Published: 2020-04-28   Modified: 2022-12-28  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi