Sekiguchi Toyokazu 関口豊和

Researcher Number	30584750
Affiliation (based on the past Project Information) *help	2019 – 2020: 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 2018: 東京大学, 大学院理学系研究科(理学部), 特任助教
Review Section/Research Field	Principal Investigator Basic Section 15010:Theoretical studies related to particle-, nuclear-, cosmic ray and astro-physics
Keywords	Principal Investigator 観測的宇宙論 / 赤方偏移21cm輝線 / インフレーション / 加速宇宙 / 暗黒エネルギー / 赤方偏移21cm線 / 宇宙紐 / 数値シミュレーション / 初期宇宙 / 位相欠陥 / アクシオン / 素粒子宇宙論 / 暗黒物質

Analysis of production mechanisms of the axion dark matter based on numerical simulationPrincipal Investigator
- Principal Investigator
  
  Sekiguchi Toyokazu
- Project Period (FY)
  2018 – 2020
- Research Category
  
  Grant-in-Aid for Scientific Research (C)
- Review Section
  
  Basic Section 15010:Theoretical studies related to particle-, nuclear-, cosmic ray and astro-physics
- Research Institution
  High Energy Accelerator Research Organization
  The University of Tokyo
Probing dark energy using redshifted 21 cm line observationsPrincipal Investigator
- Principal Investigator
  
  関口豊和
- Project Period (FY)
  2018 – 2019
- Research Category
  
  Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
- Research Institution
  High Energy Accelerator Research Organization
  The University of Tokyo

All 2021 2020 2019 2018

All Journal Article Presentation

[Journal Article] Cosmological bound on neutrino masses in the light of H0 tension2021
- Author(s)
  Sekiguchi Toyokazu、Takahashi Tomo
- Journal Title
  
  Physical Review D
  
  Volume: 103 Issue: 8 Pages: 083516-083516
- DOI
  10.1103/physrevd.103.083516
- Peer Reviewed
- Data Source
  KAKENHI-PUBLICLY-18H04339, KAKENHI-PUBLICLY-19H05110, KAKENHI-PROJECT-19K03874
[Journal Article] Early recombination as a solution to the H0 tension2021
- Author(s)
  Sekiguchi Toyokazu、Takahashi Tomo
- Journal Title
  
  Physical Review D
  
  Volume: 103 Issue: 8 Pages: 083507-083507
- DOI
  10.1103/physrevd.103.083507
- Peer Reviewed
- Data Source
  KAKENHI-PUBLICLY-18H04339, KAKENHI-PUBLICLY-19H05110, KAKENHI-PROJECT-19K03874
[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
- Peer Reviewed / Int'l Joint Research
- Data Source
  KAKENHI-PUBLICLY-18H04339, KAKENHI-PROJECT-18K03640, KAKENHI-PROJECT-17H01110
[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
- Peer Reviewed / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-18K03640, KAKENHI-PROJECT-19K03874, KAKENHI-PLANNED-15H05888, KAKENHI-PUBLICLY-19H05110, KAKENHI-PROJECT-17H01131, KAKENHI-PUBLICLY-18H04339
[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
- Peer Reviewed / Open Access / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-18K03640, KAKENHI-PROJECT-19K14708, KAKENHI-PLANNED-15H05889, KAKENHI-PROJECT-17H02875, KAKENHI-PROJECT-18H01243
[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
- Peer Reviewed / Open Access / Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-18K03640, KAKENHI-PROJECT-19K03874, KAKENHI-PLANNED-15H05888, KAKENHI-PUBLICLY-19H05110, KAKENHI-PROJECT-17H01131, KAKENHI-PROJECT-17H04836, KAKENHI-PUBLICLY-18H04340
[Journal Article] Probing primordial non-Gaussianity with 21 cm fluctuations from minihalos2019
- Author(s)
  Sekiguchi, Toyokazu and Takahashi, Tomo and Tashiro, Hiroyuki and Yokoyama, Shuichiro
- Journal Title
  
  JCAP
  
  Volume: 1902 Issue: 02 Pages: 33-33
- DOI
  10.1088/1475-7516/2019/02/033
- Peer Reviewed / Open Access
- Data Source
  KAKENHI-PLANNED-15H05888, KAKENHI-PUBLICLY-18H04339, KAKENHI-PUBLICLY-18H04356, KAKENHI-PROJECT-17H01110, KAKENHI-PROJECT-17H01131, KAKENHI-PROJECT-15K05084, KAKENHI-PROJECT-15K17646, KAKENHI-PROJECT-15K17659
[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
- Peer Reviewed / Open Access
- Data Source
  KAKENHI-PROJECT-17K05434, KAKENHI-PROJECT-18K03640, KAKENHI-PLANNED-15H05889, KAKENHI-PROJECT-15H02082, KAKENHI-PROJECT-17H01131
[Presentation] Probing dark energy and inflation with 21cm line observations2019
- Author(s)
  Toyokazu Sekiguchi
- Organizer
  JSPS-FAPESP workshop on dark energy, dark matter and galaxies
- Invited / Int'l Joint Research
- Data Source
  KAKENHI-PUBLICLY-18H04339
[Presentation] Long-term dynamics of axion strings2018
- Author(s)
  Toyokazu Sekiguchi
- Organizer
  JGRG28
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-18K03640
[Presentation] 赤方偏移21cm線を用いた初期ゆらぎの探査可能性について2018
- Author(s)
  Toyokazu Sekiguchi
- Organizer
  新学術「加速宇宙」A01班「インフレーション」小研究会
- Invited
- Data Source
  KAKENHI-PUBLICLY-18H04339
[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
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-18K03640
[Presentation] Long-term dynamics of axion strings2018
- Author(s)
  Toyokazu Sekiguchi
- Organizer
  RESCEU Summer School 2018
- Int'l Joint Research
- Data Source
  KAKENHI-PROJECT-18K03640

1. TAKAHASHI Tomo

# of Collaborated Projects: 0 results

# of Collaborated Products: 1 results
2. 川崎雅裕

# of Collaborated Projects: 0 results

# of Collaborated Products: 1 results
3. 横山順一

# of Collaborated Projects: 0 results

# of Collaborated Products: 1 results

Sekiguchi Toyokazu 関口 豊和

Research Projects

Research Products

Co-Researchers

Analysis of production mechanisms of the axion dark matter based on numerical simulationPrincipal Investigator

Principal Investigator

Project Period (FY)

Research Category

Review Section

Research Institution

Probing dark energy using redshifted 21 cm line observationsPrincipal Investigator

Principal Investigator

Project Period (FY)

Research Category

Research Institution

[Journal Article] Cosmological bound on neutrino masses in the light of H0 tension2021

Author(s)

Journal Title

DOI

Data Source

[Journal Article] Early recombination as a solution to the H0 tension2021

Author(s)

Journal Title

DOI

Data Source

[Journal Article] Probing axion dark matter with 21cm fluctuations from minihalos2021

Author(s)

Journal Title

DOI

Data Source

[Journal Article] Constraints on decaying dark matter from weak lensing and cluster counts2020

Author(s)

Journal Title

DOI

Data Source

[Journal Article] Relic abundance of dark photon dark matter2020

Author(s)

Journal Title

DOI

Data Source

[Journal Article] Smallest halos in thermal wino dark matter2019

Author(s)

Journal Title

DOI

Data Source

[Journal Article] Probing primordial non-Gaussianity with 21 cm fluctuations from minihalos2019

Author(s)

Journal Title

DOI

Data Source

[Journal Article] Long-term dynamics of cosmological axion strings2018

Author(s)

Journal Title

DOI

Data Source

[Presentation] Probing dark energy and inflation with 21cm line observations2019

Author(s)

Organizer

Data Source

[Presentation] Long-term dynamics of axion strings2018

Author(s)

Organizer

Data Source

[Presentation] 赤方偏移21cm線を用いた 初期ゆらぎの探査可能性について2018

Author(s)

Organizer

Data Source

[Presentation] Long-term dynamics in axion string networks2018

Author(s)

Organizer

Data Source

[Presentation] Long-term dynamics of axion strings2018

Author(s)

Organizer

Data Source

Sekiguchi Toyokazu 関口豊和

[Presentation] 赤方偏移21cm線を用いた初期ゆらぎの探査可能性について2018