Why does the Universe accelerate?-Exhaustive study and challenge for the future-

• Project Area: Why does the Universe accelerate? - Exhaustive study and challenge for the future -
• Project/Area Number: 20H05600
• Research Category: Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
• Allocation Type: Single-year Grants
• Review Section: Science and Engineering
• Research Institution: The University of Tokyo
• Principal Investigator: 村山 斉 東京大学, カブリ数物連携宇宙研究機構, 教授 (20222341)
• Co-Investigator(Kenkyū-buntansha): 高田 昌広 東京大学, カブリ数物連携宇宙研究機構, 教授 (40374889)
• Project Period (FY): 2020-04-01 – 2021-03-31
• Project Status: Completed (Fiscal Year 2020)
• Budget Amount: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000); Fiscal Year 2020: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
• Keywords: インフレーション / ダークマター / ダークエネルギー

Outline of Research at the Start

本領域は宇宙の加速膨張の物理機構を解明することを目的とし、第一線で活躍する研究者を各計画研究代表に置き、理論・実験・観測をそれぞれで独自の研究テーマを立ち上げ、各計画研究を跨がる融合研究分野の開拓という極めて強力かつユニークな総合的研究アプローチをとった。これにより、超弦理論から観測・実験・統計的物理解析に至る総合的な研究成果が得られた。新学術領域における研究成果、活動について事後報告書を作成する。また、今後の研究の展開のために、本領域の研究成果、活動、若手研究者育成の査定、評価を行い、今後の研究に繋げる。

Outline of Annual Research Achievements

宇宙の極初期及び現宇宙の加速する宇宙膨張の物理機構・原因究明を目的とした本新学術領域「加速宇宙」は、超弦理論から観測・実験・統計的物理解析に至る総合的な研究を展開することができた。
具体的には、超弦理論に観点に基づく宇宙の加速膨張の起源に関係するシナリオ（swampland=究極理論の沼地仮説）の提唱、すばる望遠鏡広視野宇宙探査のビッグデータによる精密宇宙論の確立、日本がリードする宇宙背景放射実験に基づく宇宙論の確立、宇宙背景放射データとすばるイメージングデータを組み合わせた物理解析手法の開発、さらに本領域研究者を中心として加速宇宙に関連する原始ブラックホールの理論的・観測的研究の研究成果を導出した新たな研究分野の開拓が挙げられる。
当初の実施計画通り、令和2年4月から6月に掛け、過去5年間の研究成果（研究成果論文リスト、共同研究リスト、代表的な研究成果の報告書、若手研究者育成の実績、受賞リスト、報道リスト、一般講演会リスト）を取りまとめ、各計画研究、公募研究、研究グループの業績等を総合的に分析・整理し、事後報告書を作成した。並行して若手研究者の育成状況、その後のキャリアパスについて追跡等分析・整理し、課題等あればそれを洗い出し、事後評価報告書に反映させた。広範に及ぶ活動成果を網羅した報告書は、関係する研究者にデータとして共有することで、最終研究成果の共有をすると共に、新たに開拓された研究分野の更なる発展を促進出来た意義は大きい。
また、成果内容に関しては外部評価委員により客観的評価と助言を受け、最終的には事後評価ヒアリングで「A+(研究領域の設定目的に照らして、期待以上の成果があった)」の高い評価受けることが出来た。
研究成果の社会的還元として初めてオンラインによる一般講演会を2回開催し、合計837名の一般参加者で、研究分野の関心の高さに応えることが出来た。

Research Progress Status

令和2年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

令和2年度が最終年度であるため、記入しない。

Research Products

• [Int'l Joint Research] UC Berkeley/Princeton University/UC Los Angeles(米国)
• [Int'l Joint Research] UCL/Durham University(英国)
• [Int'l Joint Research] Max Planck Institute for Astrophysics(ドイツ)
• [Int'l Joint Research] IUCAA(インド)
• [Int'l Joint Research] Shanghai Jiao Tong University(中国)
• [Int'l Joint Research]
• [Journal Article] Super sample covariance of the thermal Sunyaev-Zeldovich effect (2021)
  • Author(s): Osato Ken、Takada Masahiro
  • Journal Title: Physical Review D Volume: 103 Issue: 6 Pages: 1-14
  • DOI: 10.1103/physrevd.103.063501
  • Peer Reviewed
• [Journal Article] Testing stochastic gravitational wave signals from primordial black holes with optical telescopes (2021)
  • Author(s): Sugiyama Sunao、Takhistov Volodymyr、Vitagliano Edoardo、Kusenko Alexander、Sasaki Misao、Takada Masahiro
  • Journal Title: Physics Letters B Volume: 814 Pages: 136097-136097
  • DOI: 10.1016/j.physletb.2021.136097
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Power spectrum of intrinsic alignments of galaxies in IllustrisTNG (2021)
  • Author(s): Shi Jingjing、Kurita Toshiki、Takada Masahiro、Osato Ken、Kobayashi Yosuke、Nishimichi Takahiro
  • Journal Title: Journal of Cosmology and Astroparticle Physics Volume: 2021 Issue: 03 Pages: 1-34
  • DOI: 10.1088/1475-7516/2021/03/030
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Big-bang nucleosynthesis with sub-GeV massive decaying particles (2020)
  • Author(s): Kawasaki Masahiro、Kohri Kazunori、Moroi Takeo、Murai Kai、Murayama Hitoshi
  • Journal Title: Journal of Cosmology and Astroparticle Physics Volume: 2020 Issue: 12 Pages: 048-048
  • DOI: 10.1088/1475-7516/2020/12/048
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Probing the scale of grand unification with gravitational waves (2020)
  • Author(s): Buchmuller Wilfried、Domcke Valerie、Murayama Hitoshi、Schmitz Kai
  • Journal Title: Physics Letters B Volume: 809 Pages: 1-6
  • DOI: 10.1016/j.physletb.2020.135764
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Baryogenesis from a dark first-order phase transition (2020)
  • Author(s): Hall Eleanor、Konstandin Thomas、McGehee Robert、Murayama Hitoshi、Servant Geraldine
  • Journal Title: Journal of High Energy Physics Volume: 2020 Issue: 4 Pages: 1-14
  • DOI: 10.1007/jhep04(2020)042
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Proper motion measurements for stars up to 100 kpc with Subaru HSC and SDSS Stripe 82 (2020)
  • Author(s): Qiu Tian、Wang Wenting、Takada Masahiro、Yasuda Naoki、Ivezic Zeljko、Lupton Robert H、Chiba Masashi、Ishigaki Miho、Komiyama Yutaka
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: 501 Issue: 4 Pages: 5149-5175
  • DOI: 10.1093/mnras/staa3975
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Power spectrum of halo intrinsic alignments in simulations (2020)
  • Author(s): Kurita Toshiki、Takada Masahiro、Nishimichi Takahiro、Takahashi Ryuichi、Osato Ken、Kobayashi Yosuke
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: 501 Issue: 1 Pages: 833-852
  • DOI: 10.1093/mnras/staa3625
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] A comparative study of satellite galaxies in Milky Way-like galaxies from HSC, DECaLS, and SDSS (2020)
  • Author(s): Wang Wenting、Takada Masahiro、Li Xiangchong、Carlsten Scott G、Lan Ting-Wen、Shi Jingjing、Miyatake Hironao、More Surhud、Beaton Rachael L、Lupton Robert、Lin Yen-Ting、Qiu Tian、Luo Wentao
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: 500 Issue: 3 Pages: 3776-3801
  • DOI: 10.1093/mnras/staa3495
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Impacts of pre-initial conditions on anisotropic separate universe simulations: a boosted tidal response in the epoch of reionization (2020)
  • Author(s): Masaki Shogo、Nishimichi Takahiro、Takada Masahiro
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: 500 Issue: 1 Pages: 1018-1028
  • DOI: 10.1093/mnras/staa3309
  • Peer Reviewed
• [Journal Article] Blinded challenge for precision cosmology with large-scale structure: Results from effective field theory for the redshift-space galaxy power spectrum (2020)
  • Author(s): Nishimichi Takahiro、D’Amico Guido、Ivanov Mikhail M.、Senatore Leonardo、Simonovic Marko、Takada Masahiro、Zaldarriaga Matias、Zhang Pierre
  • Journal Title: Physical Review D Volume: 102 Issue: 12 Pages: 1-24
  • DOI: 10.1103/physrevd.102.123541
  • NAID: 120006997060
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Hunting Gravitational Wave Black Holes with Microlensing (2020)
  • Author(s): Abrams Natasha S.、Takada Masahiro
  • Journal Title: The Astrophysical Journal Volume: 905 Issue: 2 Pages: 1-12
  • DOI: 10.3847/1538-4357/abc6aa
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Exploring Primordial Black Holes from the Multiverse with Optical Telescopes (2020)
  • Author(s): Kusenko Alexander、Sasaki Misao、Sugiyama Sunao、Takada Masahiro、Takhistov Volodymyr、Vitagliano Edoardo
  • Journal Title: Physical Review Letters Volume: 125 Issue: 18 Pages: 1-7
  • DOI: 10.1103/physrevlett.125.181304
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Validating a minimal galaxy bias method for cosmological parameter inference using HSC-SDSS mock catalogs (2020)
  • Author(s): Sugiyama Sunao、Takada Masahiro、Kobayashi Yosuke、Miyatake Hironao、Shirasaki Masato、Nishimichi Takahiro、Park Youngsoo
  • Journal Title: Physical Review D Volume: 102 Issue: 8 Pages: 1-35
  • DOI: 10.1103/physrevd.102.083520
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Towards a non-Gaussian model of redshift space distortions (2020)
  • Author(s): Cuesta-Lazaro Carolina、Li Baojiu、Eggemeier Alexander、Zarrouk Pauline、Baugh Carlton M、Nishimichi Takahiro、Takada Masahiro
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: 498 Issue: 1 Pages: 1175-1193
  • DOI: 10.1093/mnras/staa2249
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Accurate emulator for the redshift-space power spectrum of dark matter halos and its application to galaxy power spectrum (2020)
  • Author(s): Kobayashi Yosuke、Nishimichi Takahiro、Takada Masahiro、Takahashi Ryuichi、Osato Ken
  • Journal Title: Physical Review D Volume: 102 Issue: 6 Pages: 063504-063504
  • DOI: 10.1103/physrevd.102.063504
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] The impact of projection effects on cluster observables: stacked lensing and projected clustering (2020)
  • Author(s): Sunayama Tomomi、Park Youngsoo、Takada Masahiro、Kobayashi Yosuke、Nishimichi Takahiro、Kurita Toshiki、More Surhud、Oguri Masamune、Osato Ken
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: 496 Issue: 4 Pages: 4468-4487
  • DOI: 10.1093/mnras/staa1646
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Anisotropic separate universe simulations (2020)
  • Author(s): Masaki Shogo、Nishimichi Takahiro、Takada Masahiro
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: 496 Issue: 1 Pages: 483-496
  • DOI: 10.1093/mnras/staa1579
  • Peer Reviewed
• [Journal Article] Mitigating the impact of fiber assignment on clustering measurements from deep galaxy redshift surveys (2020)
  • Author(s): Sunayama Tomomi、Takada Masahiro、Reinecke Martin、Makiya Ryu、Nishimichi Takahiro、Komatsu Eiichiro、Saito Shun、Tamura Naoyuki、Yabe Kiyoto
  • Journal Title: Journal of Cosmology and Astroparticle Physics Volume: 6 (2020) Issue: 06 Pages: 057-057
  • DOI: 10.1088/1475-7516/2020/06/057
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] On the wave optics effect on primordial black hole constraints from optical microlensing search (2020)
  • Author(s): Sugiyama Sunao、Kurita Toshiki、Takada Masahiro
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: 493 Issue: 3 Pages: 3632-3641
  • DOI: 10.1093/mnras/staa407
  • Peer Reviewed
• [Presentation] Prime Focus Spectrograph (PFS) (2021)
  • Author(s): Hitoshi Murayama
  • Organizer: 237th Meeting of the American Astronomical Society
  • Int'l Joint Research
• [Presentation] すばるHSCによる物理的宇宙論 (2020)
  • Author(s): 高田昌広
  • Organizer: 日本物理学会2020秋季大会一般シンポジウム「観測的宇宙論の進展と展望」
  • Invited
• [Presentation] Dark Colors (2020)
  • Author(s): Hitoshi Murayama
  • Organizer: Reconnect2020
  • Int'l Joint Research / Invited
• [Presentation] Recent topics in Particle Physics (2020)
  • Author(s): Hitoshi Murayama
  • Organizer: Strings and Fields 2020
  • Int'l Joint Research / Invited
• [Remarks] 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ー
  • URL: http://acceleration.ipmu.jp/
• [Remarks] 東京大学国際高等研究所カブリ数物連携宇宙研究機構
  • URL: https://www.ipmu.jp/ja