ガンマ線と大規模構造のクロス相関による暗黒物質粒子の探査

• Project Area: Why does the Universe accelerate? - Exhaustive study and challenge for the future -
• Project/Area Number: 18H04340
• Research Category: Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
• Allocation Type: Single-year Grants
• Research Institution: The University of Tokyo
• Principal Investigator: 安藤 真一郎 東京大学, カブリ数物連携宇宙研究機構, 客員科学研究員 (80791970)
• Project Period (FY): 2018-04-01 – 2020-03-31
• Project Status: Completed (Fiscal Year 2019)
• Budget Amount: ¥10,400,000 (Direct Cost: ¥8,000,000、Indirect Cost: ¥2,400,000); Fiscal Year 2019: ¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000); Fiscal Year 2018: ¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
• Keywords: 暗黒物質探査 / ガンマ線宇宙物理学 / 宇宙の大規模構造 / 衛星銀河 / 銀河サーベイ

Outline of Annual Research Achievements

暗黒物質対消滅を探査する上で、非常に有力な候補天体として矮小銀河がある。これらは構造形成の過程で銀河よりも先に形成された構造であり、重力によって銀河に降着した衛星銀河である。すでに銀河内に数10の矮小銀河が見つかっているが、将来観測計画であるLSSTを用いることにより、さらに多くの矮小銀河が見つかることが期待されている。これらとガンマ線データのクロス相関を取ることで、暗黒物質対消滅への制限をより精度良く求めることに成功した。まず、構造形成理論を用いた現実的な事前確率分布を初めて理論的に構築し、従来考えられていた制限を大幅に書き換えた(Phys.Rev.D 102, 061302)。またLSSTで見つかると考えられる矮小銀河の数と質量分布を予言し、そこから期待される暗黒物質への制限を導いた(JCAP 1910, 040)。
全天ガンマ線データと、宇宙大規模構造とのクロス相関関数を解析した。大規模構造のデータはDark Energy Surveyによる重力レンズマップを利用した。こうすることにより暗黒物質を天体によらない形で直接捉えることができるという利点がある。この結果、ガンマ線と重力レンズマップのクロス相関を検出することに世界で初めて成功し、尚且つそのデータが高エネルギー天体からくるものと無矛盾であることを示した。暗黒物質対消滅に対する制限も得ることに成功した。(Phys.Rev.Lett. 124, 101102)
この他暗黒物質サブハローの性質を数値シミュレーションを用いて解析したもの(MNRAS 492, 3662)、低輝度銀河周りのガンマ線データを用いて暗黒物質対消滅を制限したもの(JCAP 2001, 059)、ガンマ線、ニュートリノ、宇宙線というマルチメッセンジャーを用いて暗黒物質の崩壊を議論したもの(JCAP 2001, 003)など、成果は多岐にわたる。

Research Progress Status

令和元年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

令和元年度が最終年度であるため、記入しない。

Research Products

• [Int'l Joint Research] アムステルダム大学(オランダ)
• [Int'l Joint Research] インペリアルカレッジ・ロンドン(英国)
• [Int'l Joint Research] SISSA/トリノ大学(イタリア)
• [Int'l Joint Research] カーネギーメロン大学/バージニア工科大学(米国)
• [Int'l Joint Research] アムステルダム大学(オランダ)
• [Int'l Joint Research] MSSL UCL(英国)
• [Journal Article] Constraining dark matter annihilation with HSC low surface brightness galaxies (2020)
  • Author(s): Hashimoto Daiki、Macias Oscar、Nishizawa Atsushi J.、Hayashi Kohei、Takada Masahiro、Shirasaki Masato、Ando Shin'ichiro
  • Journal Title: Journal of Cosmology and Astroparticle Physics Volume: 2020 Issue: 01 Pages: 059-059
  • DOI: 10.1088/1475-7516/2020/01/059
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] The abundance and structure of subhaloes near the free streaming scale and their impact on indirect dark matter searches (2020)
  • Author(s): Ishiyama Tomoaki、Ando Shin’ichiro
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: 492 Issue: 3 Pages: 3662-3671
  • DOI: 10.1093/mnras/staa069
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Probing heavy dark matter decays with multi-messenger astrophysical data (2020)
  • Author(s): Koji Ishiwata, Oscar Macias, Shin'ichiro Ando, Makoto Arimoto
  • Journal Title: JCAP Volume: 01 Issue: 01 Pages: 003-003
  • DOI: 10.1088/1475-7516/2020/01/003
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Detection of Cross-Correlation between Gravitational Lensing and γ Rays (2020)
  • Author(s): Ammazzalorso S.、Gruen D.、Regis M.、Camera S.、Ando S.、Fornengo N.他
  • Journal Title: Physical Review Letters Volume: 124 Issue: 10 Pages: 101102-101102
  • DOI: 10.1103/physrevlett.124.101102
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Probing dark matter signals in neutrino telescopes through angular power spectrum (2020)
  • Author(s): Dekker Ariane、Chianese Marco、Ando Shin'ichiro
  • Journal Title: Journal of Cosmology and Astroparticle Physics Volume: 2020 Issue: 09 Pages: 007-007
  • DOI: 10.1088/1475-7516/2020/09/007
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Cross-correlation of the extragalactic gamma-ray background with the thermal Sunyaev-Zel’dovich effect in the cosmic microwave background (2020)
  • Author(s): Shirasaki Masato、Macias Oscar、Ando Shin’ichiro、Horiuchi Shunsaku、Yoshida Naoki
  • Journal Title: Physical Review D Volume: 101 Issue: 10 Pages: 103022-103022
  • DOI: 10.1103/physrevd.101.103022
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Structure formation models weaken limits on WIMP dark matter from dwarf spheroidal galaxies (2020)
  • Author(s): Ando Shin’ichiro、Geringer-Sameth Alex、Hiroshima Nagisa、Hoof Sebastian、Trotta Roberto、Walker Matthew G.
  • Journal Title: Physical Review D Volume: 102 Issue: 6 Pages: 016302-016302
  • DOI: 10.1103/physrevd.102.061302
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Smallest halos in thermal wino dark matter (2019)
  • 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
• [Journal Article] Halo Substructure Boosts to the Signatures of Dark Matter Annihilation (2019)
  • Author(s): Ando Shin’ichiro、Ishiyama Tomoaki、Hiroshima Nagisa
  • Journal Title: Galaxies Volume: 7 Issue: 3 Pages: 68-68
  • DOI: 10.3390/galaxies7030068
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Discovery prospects of dwarf spheroidal galaxies for indirect dark matter searches (2019)
  • Author(s): Ando Shin'ichiro、Kavanagh Bradley J.、Macias Oscar、Alves Tiago、Broersen Siebren、Delnoij Stijn、Goldman Thomas、Groefsema Jim、Kleverlaan Jorinde、Lenssen Ja?r、Muskens Toon、Visser Liam X. Palma、Peerbooms Ebo、Linden Bram van der、Verberne Sill
  • Journal Title: Journal of Cosmology and Astroparticle Physics Volume: 2019 Issue: 10 Pages: 040-040
  • DOI: 10.1088/1475-7516/2019/10/040
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Angular power spectrum analysis on current and future high-energy neutrino data (2019)
  • Author(s): Dekker Ariane、Ando Shin'ichiro
  • Journal Title: Journal of Cosmology and Astroparticle Physics Volume: 2019 Issue: 02 Pages: 002-002
  • DOI: 10.1088/1475-7516/2019/02/002
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] A Gaia DR2 search for dwarf galaxies towards Fermi-LAT sources: implications for annihilating dark matter (2018)
  • Author(s): Ciuca Ioana、Kawata Daisuke、Ando Shin’ichiro、Calore Francesca、Read Justin I、Mateu Cecilia
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: 480 Issue: 2 Pages: 2284-2291
  • DOI: 10.1093/mnras/sty1994
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Constraints on MeV dark matter using neutrino detectors and their implication for the 21-cm results (2018)
  • Author(s): Klop Niki、Ando Shin’ichiro
  • Journal Title: Physical Review D Volume: 98 Issue: 10 Pages: 103004-103004
  • DOI: 10.1103/physrevd.98.103004
  • Peer Reviewed / Int'l Joint Research
• [Presentation] Searching for particle dark matter by cross-correlating gamma rays and large-scale structure (2020)
  • Author(s): 安藤真一郎
  • Organizer: 加速宇宙シンポジウム
  • Int'l Joint Research
• [Presentation] 暗黒物質サブハローの性質と直接・間接検出実験への示唆 (2020)
  • Author(s): 安藤真一郎
  • Organizer: 新学術「地下宇宙」領域研究会
  • Int'l Joint Research
• [Presentation] Understanding halo substructure for indirect dark matter searches (2019)
  • Author(s): 安藤真一郎
  • Organizer: Johns Hopkins Workshop “Particle Physics in the Universe”
  • Int'l Joint Research / Invited
• [Presentation] Generic constraints on sources of diffuse high energy neutrino flux (2019)
  • Author(s): 安藤真一郎
  • Organizer: Conference on Perspectives in Astroparticle physics from High Energy Neutrinos
  • Int'l Joint Research / Invited
• [Presentation] Astrophysical neutrino theory (2019)
  • Author(s): 安藤真一郎
  • Organizer: Prospects in Neutrino Physics
  • Int'l Joint Research / Invited
• [Presentation] Modeling Evolution of Dark Matter Substructure and Annihilation Boost (2019)
  • Author(s): 廣島渚
  • Organizer: 新学術領域「なぜ宇宙は加速するのか？- 徹底的究明と将来への挑戦-」
  • Int'l Joint Research
• [Presentation] Analytic modeling of subhalo evolution and annihilation boost (2018)
  • Author(s): 安藤真一郎
  • Organizer: Halo Substructure and Dark Matter Searches
  • Int'l Joint Research / Invited
• [Presentation] Modeling evolution of dark matter substructure and annihilation boost (2018)
  • Author(s): 安藤真一郎
  • Organizer: TeV Particle Astrophysics
  • Int'l Joint Research
• [Presentation] Modeling dark matter substructure and annihilation boost for indirect searches (2018)
  • Author(s): 安藤真一郎
  • Organizer: Dark Ghosts
  • Int'l Joint Research / Invited
• [Presentation] Analytic modeling of subhalo evolution and annihilation boost (2018)
  • Author(s): 安藤真一郎
  • Organizer: 宇宙・素粒子研究の融合によるマルチメッセンジャー天文学の推進
  • Int'l Joint Research / Invited
• [Presentation] Modeling evolution of dark matter substructure and annihilation boost (2018)
  • Author(s): 廣島渚
  • Organizer: 日本物理学会 2018年秋季大会
• [Presentation] Modeling evolution of dark matter substructure and annihilation boost (2018)
  • Author(s): 廣島渚
  • Organizer: COSMO 2018
  • Int'l Joint Research
• [Presentation] Searching for non-Gravitational Signatures of Dark Matter in the Galactic Center (2018)
  • Author(s): Oscar Macias
  • Organizer: 宇宙・素粒子研究の融合によるマルチメッセンジャー天文学の推進
  • Int'l Joint Research / Invited
• [Funded Workshop] Barolo Astroparticle Meeting (2018)