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• 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,Daniel … 全著者表示

  Proceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023)   2023年8月

  DOI

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  記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）   出版者・発行元：Sissa Medialab   共著  

• 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 , … 全著者表示

  Monthly Notices of the Royal Astronomical Society   523 ( 4 )   5353 - 5387   2023年5月  [査読有り]

  DOI

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  記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Oxford University Press (OUP)   共著  

  A deep survey of the Large Magellanic Cloud at ~0.1-100 TeV photon energies with the Cherenkov Telescope Array is planned. We assess the detection prospects based on a model for the emission of the galaxy, comprising the four known TeV emitters, mock populations of sources, and interstellar emission on galactic scales. We also assess the detectability of 30 Doradus and SN 1987A, and the constraints that can be derived on the nature of dark matter. The survey will allow for fine spectral studies of N 157B, N 132D, LMC P3, and 30 Doradus C, and half a dozen other sources should be revealed, mainly pulsar-powered objects. The remnant from SN 1987A could be detected if it produces cosmic-ray nuclei with a flat power-law spectrum at high energies, or with a steeper index 2.3-2.4 pending a flux increase by a factor >3-4 over ~2015-2035. Large-scale interstellar emission remains mostly out of reach of the survey if its >10 GeV spectrum has a soft photon index ~2.7, but degree-scale 0.1-10 TeV pion-decay emission could be detected if the cosmic-ray spectrum hardens above >100 GeV. The 30 Doradus star-forming region is detectable if acceleration efficiency is on the order of 1 - 10 per cent of the mechanical luminosity and diffusion is suppressed by two orders of magnitude within <100 pc. Finally, the survey could probe the canonical velocity-averaged cross section for self-annihilation of weakly interacting massive particles for cuspy Navarro-Frenk-White profiles....

  その他リンク： 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

  H. Abe,S. Abe,V.A. Acciari,T. Aniello,S. Ansoldi,L.A. Antonelli,A. Arbet Engels,C. Arcaro,M. Artero … 全著者表示

  Physical Review Letters   130 ( 6 )   2023年2月

  DOI

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  記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：American Physical Society (APS)   共著  

  その他リンク： https://link.aps.org/article/10.1103/PhysRevLett.130.061002

• Constraining the primordial curvature perturbation using dark matter substructure

  Shin’ichiro Ando,Nagisa Hiroshima,Koji Ishiwata

  Physical Review D   106 ( 10 )   2022年11月  [査読有り]

  DOI

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  記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：American Physical Society (APS)   共著  

  その他リンク： https://link.aps.org/article/10.1103/PhysRevD.106.103014

• 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年10月  [査読有り]

  DOI

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  担当区分：筆頭著者,　責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Oxford University Press (OUP)   共著  

  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.

  その他リンク： https://academic.oup.com/mnras/advance-article-pdf/doi/10.1093/mnras/stac2857/46385435/stac2857.pdf

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• 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年1月  [査読有り]

  DOI arXiv

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  記述言語：英語   掲載種別：速報，短報，研究ノート等（学術雑誌）   共著  

  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.

  その他リンク： http://arxiv.org/pdf/2401.15606v1

• Dark Matter Search with Cherenkov Telescope Array

  Nagisa Hiroshima

  34th conference in the Rencontres de Blois series   2023年10月

  DOI arXiv

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  記述言語：英語   掲載種別：研究発表ペーパー・要旨（国際会議）   単著  

  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.

  その他リンク： 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年11月  [査読有り]

  DOI arXiv

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  記述言語：英語   掲載種別：速報，短報，研究ノート等（学術雑誌）   出版者・発行元：American Physical Society (APS)   共著  

  その他リンク： 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年10月  [査読有り]

  DOI arXiv

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  担当区分：筆頭著者,　責任著者   記述言語：英語   掲載種別：速報，短報，研究ノート等（学術雑誌）   出版者・発行元：Oxford University Press (OUP)   共著  

  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.

  その他リンク： 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年10月  [査読有り]

  DOI arXiv

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  担当区分：責任著者   記述言語：英語   掲載種別：速報，短報，研究ノート等（学術雑誌）   出版者・発行元：American Physical Society (APS)   共著  

  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.

  その他リンク： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevD.104.083547/fulltext

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• 公財）富山第一銀行奨学財団賞 奨励賞

  2023年07月   富山第一銀行奨学財団  

  受賞者：廣島 渚

• 富山大学学長賞 第5回「未知に挑む女性研究者賞」

  2021年10月   富山大学  

  受賞者：廣島 渚

• KEKスチューデントデイ機構長賞

  2016年10月   高エネルギー加速器研究機構  

  受賞者：廣島 渚

• 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年07月   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  

  受賞者：廣島渚

• 竹腰賞

  2013年07月   京都大学理学研究科  

  受賞者：廣島 渚

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• 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年3月 

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  開催年月日： 2024年3月

  記述言語：日本語   会議種別：口頭発表（一般）  

• 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年3月 

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  開催年月日： 2024年3月

  記述言語：日本語   会議種別：口頭発表（一般）  

• 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年3月 

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  開催年月日： 2024年3月

  記述言語：英語   会議種別：口頭発表（一般）  

• Environments for DM study

  Nagisa Hiroshima

  Extreme Mass Dark Matter Workshop: from Superlight to Superheavy  2024年3月 

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  開催年月日： 2024年3月

  記述言語：英語   会議種別：口頭発表（一般）  

• 暗黒物質探査:宇宙物理学的側面から

  廣島渚  [招待有り]

  第３６回 理論懇シンポジウム  2023年12月 

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  開催年月日： 2023年12月

  記述言語：日本語   会議種別：口頭発表（招待・特別）  

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