Papers 【 display / non-display 】

Papers 【 display / non-display 】

• Potential of the Cherenkov Telescope Array for studying the young nearby supernova remnants

  Dmitry A Prokhorov,Shiu-Hang Lee,Shigehiro Nagataki,Jacco Vink,Donald Ellison,Gilles Ferrand,Danie … Show more authors

  2023.8

  DOI

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  Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：Sissa Medialab   Joint Work  

• Sensitivity of the Cherenkov Telescope Array to TeV photon emission from the Large Magellanic Cloud

  Acharyya , A.,Adam , R.,Aguasca-Cabot , A.,Agudo , I.,Aguirre-Santaella , A.,Alfaro , J.,Aloisio , … Show more authors

  523 ( 4 )   5353 - 5387   2023.5  [Reviewed]

  DOI

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  Language：English   Publishing type：Research paper (scientific journal)   Publisher：Oxford University Press (OUP)   Joint Work  

  Other Link： https://academic.oup.com/mnras/advance-article-pdf/doi/10.1093/mnras/stad1576/50461207/stad1576.pdf

• Search for Gamma-Ray Spectral Lines from Dark Matter Annihilation up to 100 TeV toward the Galactic Center with MAGIC

  130 ( 6 )   2023.2

  DOI

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  Language：English   Publishing type：Research paper (scientific journal)   Publisher：American Physical Society (APS)   Joint Work  

  Other Link： https://link.aps.org/article/10.1103/PhysRevLett.130.061002

• Constraining the primordial curvature perturbation using dark matter substructure

  106 ( 10 )   2022.11  [Reviewed]

  DOI

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  Language：English   Publishing type：Research paper (scientific journal)   Publisher：American Physical Society (APS)   Joint Work  

  Other Link： https://link.aps.org/article/10.1103/PhysRevD.106.103014

• Semi-analytical frameworks for subhaloes from the smallest to the largest scale

  517 ( 2 )   2728 - 2737   2022.10  [Reviewed]

  DOI

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  Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Oxford University Press (OUP)   Joint Work  

  Other Link： https://academic.oup.com/mnras/advance-article-pdf/doi/10.1093/mnras/stac2857/46385435/stac2857.pdf

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Review Papers 【 display / non-display 】

Review Papers 【 display / non-display 】

• Search for heavy dark matter from dwarf spheroidal galaxies: leveraging cascades and subhalo models

  Deheng Song,Nagisa Hiroshima,Kohta Murase

  Journal of Cosmology and Astroparticle Physics   2024.1  [Reviewed]  [Invited]

  DOI arXiv

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  Language：English   Publishing type：Rapid communication, short report, research note, etc. (scientific journal)   Joint Work  

  The Fermi Large Area Telescope (Fermi-LAT) has been widely used to search for
  Weakly Interacting Massive Particle (WIMP) dark matter signals due to its
  unparalleled sensitivity in the GeV energy band. The leading constraints for
  WIMP by Fermi-LAT are obtained from the analyses of dwarf spheroidal galaxies
  within the Local Group, which are compelling targets for dark matter searches
  due to their relatively low astrophysical backgrounds and high dark matter
  content. In the meantime, the search for heavy dark matter with masses above
  TeV remains a compelling and relatively unexplored frontier. In this study, we
  utilize 14-year Fermi-LAT data to search for dark matter annihilation and decay
  signals in 8 classical dwarf spheroidal galaxies within the Local Group. We
  consider secondary emission caused by electromagnetic cascades of prompt gamma
  rays and electrons/positrons from dark matter, which enables us to extend the
  search with Fermi-LAT to heavier dark matter cases. We also update the dark
  matter subhalo model with informative priors respecting the fact that they
  reside in subhalos of our Milky Way halo aiming to enhance the robustness of
  our results. We place constraints on dark matter annihilation cross section and
  decay lifetime for dark matter masses ranging from $10^3$ GeV to $10^{11}$ GeV,
  where our limits are more stringent than those obtained by many other
  high-energy gamma-ray instruments.

  Other Link： http://arxiv.org/pdf/2401.15606v1

• Dark Matter Search with Cherenkov Telescope Array

  Nagisa Hiroshima

  34th conference in the Rencontres de Blois series   2023.10

  DOI arXiv

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  Language：English   Publishing type：Research paper, summary (international conference)   Single Work  

  Many models of dark matter (DM) are now widely considered and probed
  intensively with accelerators, underground detectors, and astrophysical
  experiments. Among the various approaches, high-energy astrophysical
  observations are extremely useful to complement laboratory searches for some DM
  candidates. In the near future, the Cherenkov Telescope Array (CTA) should
  enable us to access much heavier weakly interacting massive particles, as well
  as a broad range of other DM candidates. In this talk, we describe DM searches
  with CTA.

  Other Link： http://arxiv.org/pdf/2310.01847v1

• Constraining the primordial curvature perturbation using dark matter substructure

  Shin’ichiro Ando,Nagisa Hiroshima,Koji Ishiwata

  Physical Review D   106 ( 10 )   2022.11  [Reviewed]  [Invited]

  DOI arXiv

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  Language：English   Publishing type：Rapid communication, short report, research note, etc. (scientific journal)   Publisher：American Physical Society (APS)   Joint Work  

  Other Link： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevD.106.103014/fulltext

• Semi-analytical frameworks for subhaloes from the smallest to the largest scale

  Nagisa Hiroshima,Shin’ichiro Ando,Tomoaki Ishiyama

  Monthly Notices of the Royal Astronomical Society   517 ( 2 )   2728 - 2737   2022.10  [Reviewed]  [Invited]

  DOI arXiv

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  Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Rapid communication, short report, research note, etc. (scientific journal)   Publisher：Oxford University Press (OUP)   Joint Work  

  ABSTRACT
  Substructures of dark matter halo, called subhaloes, provide important clues to understand the nature of dark matter. We construct a useful model to describe the properties of subhalo mass functions based on the well-known analytical prescriptions, the extended Press–Schechter theory. The unevolved subhalo mass functions at arbitrary mass scales become describable without introducing free parameters. The different host halo evolution histories are directly recast to their subhalo mass functions. As applications, we quantify the effects from (i) the Poisson fluctuation, (ii) the host-mass scatter, and the (iii) different tidal evolution models on observables in the current Universe with this scheme. The Poisson fluctuation dominates in the number count of the mass ratio to the host of $\sim {\cal O}(10^{-2})$, where the intrinsic scatter is smaller by a factor of a few. The host-mass scatter around its mean does not affect the subhalo mass function. Different models of the tidal evolution predict a factor of ∼2 difference in numbers of subhaloes with $\lesssim {\cal O}(10^{-5})$, while the dependence of the Poisson fluctuation on the tidal evolution models is subtle. The scheme provides a new tool for investigating the smallest scale structures of our Universe which are to be observed in near future experiments.

  Other Link： https://academic.oup.com/mnras/article-pdf/517/2/2728/46561854/stac2857.pdf

• Impacts of new small-scale N-body simulations on dark matter annihilations constrained from cosmological 21-cm line observations

  Nagisa Hiroshima,Kazunori Kohri,Toyokazu Sekiguchi,Ryuichi Takahashi

  Physical Review D   104 ( 8 )   2021.10  [Reviewed]  [Invited]

  DOI arXiv

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  Authorship：Corresponding author   Language：English   Publishing type：Rapid communication, short report, research note, etc. (scientific journal)   Publisher：American Physical Society (APS)   Joint Work  

  We revisit constraints on annihilating dark matter based on the global 21cm
  signature observed by EDGES. For this purpose, we used the numerical data of
  the latest N-body simulation performed by state-of-the-art standard in order to
  estimate the boost factor at high redshifts ($z$ = 10 - 100), which enhances
  the annihilation of dark matter in course of structure formation. By taking
  into account to what fraction injected energy from dark matter annihilation
  contributes to ionization, excitation and heating of intergalactic medium
  during dark ages, we estimated how large the global 21cm absorption can be. By
  assuming the thermal freezeout scenario, we find that $m_{\rm DM} < 15$ GeV and
  $m_{\rm DM} < 3$ GeV have been excluded at 95$\%$ C.L. for the annihilation
  modes into $b\bar{b}$ and $e^+ e^-$, respectively.

  Other Link： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevD.104.083547/fulltext

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Awards 【 display / non-display 】

Awards 【 display / non-display 】

• 公財）富山第一銀行奨学財団賞 奨励賞

  2023.7   富山第一銀行奨学財団  

  Individual or group name of awards：廣島 渚

• The Award for Female Researchers of the University of Toyama

  2021.10   University of Toyama  

  Individual or group name of awards：Nagisa Hiroshima

• Director General Award of KEK Student day

  2016.10   High Energy Accelerator Research Organization, KEK  

  Individual or group name of awards：Nagisa Hiroshima

• 天文・天体物理若手夏の学校 オーラルアワード(重力・宇宙論分科会)

  2014.7   第44回天文・天体物理若手夏の学校   FRBを用いた宇宙論モデルの検証手法

  Individual or group name of awards：廣島渚

• Takekoshi Award

  2013.7   Graduate School of Science, Kyoto University  

  Individual or group name of awards：Nagisa Hiroshima

Presentations 【 display / non-display 】

Presentations 【 display / non-display 】

• 暗黒物質ハロー階層構造から得られる 原始揺らぎパワースペクトルへの制限

  安藤真一郎,廣島渚,石渡弘治

  日本物理学会 2024年春季大会  2024.3 

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  Event date： 2024.3

  Language：Japanese   Presentation type：Oral presentation (general)  

• 全スケール暗黒物質ハローの準解析的モデリング

  廣島渚,安藤真一郎,石山智明

  日本天文学会2024年春季年会  2024.3 

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  Event date： 2024.3

  Language：Japanese   Presentation type：Oral presentation (general)  

• Semi-analytic description of halo structures and its application

  Nagisa Hiroshima

  FY2023 "What is dark matter? - Comprehensive study of the huge discovery space in dark matter"  2024.3 

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  Event date： 2024.3

  Language：English   Presentation type：Oral presentation (general)  

• Environments for DM study

  Nagisa Hiroshima

  Extreme Mass Dark Matter Workshop: from Superlight to Superheavy  2024.3 

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  Event date： 2024.3

  Language：English   Presentation type：Oral presentation (general)  

• 暗黒物質探査:宇宙物理学的側面から

  廣島渚  [Invited]

  第３６回 理論懇シンポジウム  2023.12 

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  Event date： 2023.12

  Language：Japanese   Presentation type：Oral presentation (invited, special)  

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