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

Analysis of production mechanisms of the axion dark matter based on numerical simulation

Research Project

Project/Area Number 18K03640
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 15010:Theoretical studies related to particle-, nuclear-, cosmic ray and astro-physics
Research InstitutionHigh Energy Accelerator Research Organization (2019-2020)
The University of Tokyo (2018)

Principal Investigator

Sekiguchi Toyokazu  大学共同利用機関法人高エネルギー加速器研究機構, 素粒子原子核研究所, 研究員 (30584750)

Project Period (FY) 2018-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2020: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2019: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2018: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Keywords暗黒物質 / 素粒子宇宙論 / 観測的宇宙論 / アクシオン / 位相欠陥 / 初期宇宙 / 数値シミュレーション / 宇宙紐
Outline of Final Research Achievements

Focusing on the possibility of axion dark matter, we have investigated a variety of its cosmological aspects, including its generation processes, time evolution afterwards, and observability in the present universe. Regarding the generation processes from axion topological defects such as comic strings, we have successfully derived novel implications based on the state-of-the-art massively parallel simulations. In particular, we have shown that axion cosmic strings have a long-term dynamics, which have innovated the previous picture of the cosmic strings. In addition, we have developed an innovative numerical simulation method of the axion electrodynamics and investigated its cosmological applications. We also have studied probing axion dark matter scenario with 21cm line observations. Our study have improved our understanding of axion cosmology extensively.

Academic Significance and Societal Importance of the Research Achievements

暗黒物質の正体は宇宙・素粒子分野における最大の謎であり、その正体を明らかにすることで未知の物理への足掛かりが得られると期待されている。様々な暗黒物質候補の中で、アクシオンは最有力候補の一つであり、その直接検出のために様々な実験が世界中で進行・計画されている。他方、アクシオン暗黒物質の主要な生成過程であるアクシオン位相欠陥からのアクシオン放出には大きな理論的不定性があり、検出実験を計画する上で大きな問題となっている。我々は世界最大規模の第一原理数値シミュレーションに基づきアクシオン位相欠陥のダイナミクスにおける未知の性質を明らかにし、更なる理論予言の発展を導いた。

Report

(4 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • 2018 Research-status Report
  • Research Products

    (13 results)

All 2021 2020 2019 2018 Other

All Int'l Joint Research (5 results) Journal Article (5 results) (of which Int'l Joint Research: 4 results,  Peer Reviewed: 5 results,  Open Access: 3 results) Presentation (3 results) (of which Int'l Joint Research: 3 results)

  • [Int'l Joint Research] Institute for Basic Science(韓国)

    • Related Report
      2020 Annual Research Report
  • [Int'l Joint Research] Harvard University(米国)

    • Related Report
      2020 Annual Research Report
  • [Int'l Joint Research] Harvard University(米国)

    • Related Report
      2019 Research-status Report
  • [Int'l Joint Research] the University of Helsinki/Helsinki Institute of Physics(フィンランド)

    • Related Report
      2019 Research-status Report
  • [Int'l Joint Research] Portsmouth University(英国)

    • Related Report
      2019 Research-status Report
  • [Journal Article] Probing axion dark matter with 21cm fluctuations from minihalos2021

    • Author(s)
      Kadota Kenji、Sekiguchi Toyokazu、Tashiro Hiroyuki
    • Journal Title

      Physical Review D

      Volume: 103 Issue: 2 Pages: 023521-023521

    • DOI

      10.1103/physrevd.103.023521

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Constraints on decaying dark matter from weak lensing and cluster counts2020

    • Author(s)
      Enqvist Kari、Nadathur Seshadri、Sekiguchi Toyokazu、Takahashi Tomo
    • Journal Title

      Journal of Cosmology and Astroparticle Physics

      Volume: 2020 Issue: 04 Pages: 015-015

    • DOI

      10.1088/1475-7516/2020/04/015

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Relic abundance of dark photon dark matter2020

    • Author(s)
      Agrawal Prateek、Kitajima Naoya、Reece Matthew、Sekiguchi Toyokazu、Takahashi Fuminobu
    • Journal Title

      Physics Letters B

      Volume: 801 Pages: 135136-135136

    • DOI

      10.1016/j.physletb.2019.135136

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Smallest halos in thermal wino dark matter2019

    • Author(s)
      Ando Shin’ichiro、Kamada Ayuki、Sekiguchi Toyokazu、Takahashi Tomo
    • Journal Title

      Physical Review D

      Volume: 100 Issue: 12 Pages: 123519-123519

    • DOI

      10.1103/physrevd.100.123519

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Long-term dynamics of cosmological axion strings2018

    • Author(s)
      Kawasaki Masahiro、Sekiguchi Toyokazu、Yamaguchi Masahide、Yokoyama Jun’ichi
    • Journal Title

      Progress of Theoretical and Experimental Physics

      Volume: 2018 Issue: 9 Pages: 1-1

    • DOI

      10.1093/ptep/pty098

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Long-term dynamics of axion strings2018

    • Author(s)
      Toyokazu Sekiguchi
    • Organizer
      JGRG28
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Long-term dynamics in axion string networks2018

    • Author(s)
      Toyokazu Sekiguchi
    • Organizer
      10th symposium on Discovery, Fusion, Creation of New Knowledge by Multidisciplinary Computational Sciences
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Long-term dynamics of axion strings2018

    • Author(s)
      Toyokazu Sekiguchi
    • Organizer
      RESCEU Summer School 2018
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research

URL: 

Published: 2018-04-23   Modified: 2022-01-27  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi