宇宙の揺らぎと構造の進化、その背後にある物理の究明

• Project Area: Why does the Universe accelerate? - Exhaustive study and challenge for the future -
• Project/Area Number: 15H05889
• 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: Tohoku University
• Principal Investigator: 高橋 史宜 東北大学, 理学研究科, 教授 (60503878)
• Co-Investigator(Kenkyū-buntansha): 樽家 篤史 京都大学, 基礎物理学研究所, 准教授 (40334239) ; 川崎 雅裕 東京大学, 宇宙線研究所, 教授 (50202031) ; 郡 和範 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, 准教授 (50565819)
• Project Period (FY): 2015-06-29 – 2020-03-31
• Project Status: Granted (Fiscal Year 2019)
• Budget Amount: ¥40,170,000 (Direct Cost: ¥30,900,000、Indirect Cost: ¥9,270,000); Fiscal Year 2019: ¥9,490,000 (Direct Cost: ¥7,300,000、Indirect Cost: ¥2,190,000); Fiscal Year 2018: ¥8,710,000 (Direct Cost: ¥6,700,000、Indirect Cost: ¥2,010,000); Fiscal Year 2017: ¥8,710,000 (Direct Cost: ¥6,700,000、Indirect Cost: ¥2,010,000); Fiscal Year 2016: ¥9,100,000 (Direct Cost: ¥7,000,000、Indirect Cost: ¥2,100,000); Fiscal Year 2015: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
• Keywords: 暗黒物質 / インフレーション / 暗黒エネルギー / ダークマター / ダークエネルギー / 宇宙物理 / 密度揺らぎの進化 / 素粒子論 / 構造形成 / 超対称性理論 / 元素合成 / 宇宙背景輻射

Outline of Annual Research Achievements

高橋はインフラトンとダークマターをアクシオンで統一的に説明する模型を構築し，そのパラメター空間を詳細に調べることで将来の太陽アクシオン実験およびCMB観測で検証可能であることを示した，川崎は宇宙初期に原始ブラックホールを生成するインフレーション模型を構築し、この模型がLIGOで発見された重力波イベントと宇宙の暗黒物質の両方を説明することができることを示した。樽家は構造形成の非線形段階に現れるシェルクロッシングと呼ばれるコールドダークマター特有の現象をラグランジェ摂動論を用いて記述することに成功した。また、N体シミュレーションを用いてシェルクロッシング後に現れるコールドダークマターの位相空間構造を定量化することで、ハロー外縁部の構造が自己相似解でよく記述できることを見出した。郡は，IceCube実験が報告した100TeVから数PeVのエネルギーを持つ高エネルギーニュートリノが持つ複雑なスペクトルの特徴を崩壊するダークマターによってフィットするモデルを提案した。千葉は暗黒物質の正体に知見を得るために、銀河系周囲の暗黒物質構造を反映している矮小衛星銀河の探査を行い、幾つかの新しい銀河を発見した。また、その発見率が冷たい暗黒物質の予言と矛盾しないことが分かった。伊部は strong CP problem の解であると期待される Peccei-Quinn 機構に対する再考察行った。特に Peccei-Quinn 機構に重要な大域的対称性をゲージ対称性から導く簡潔な一般的処方箋を考案した。横崎はQCDアクシオンは強いCP問題の解の帰結として現れる新粒子である。高橋・横崎は大学院生の大道とともに、QCDアクシオンが隠れたゲージボソンと結合するとき、アクシオンと光子との結合が通常に比べて100倍程度大きくなり、将来実験で容易に観測出来ることを示した。

Current Status of Research Progress

2: Research has progressed on the whole more than it was originally planned.

Reason

ダークマターとインフレーションを統一的に記述し，かつ将来CMBやレーザー実験において検証可能なアクシオン模型を構築するなど，他計画研究班および公募研究との連携に繋がる研究成果をあげることができた．また特筆すべき成果として，矮小衛星銀河探索したところ新しい銀河を発見し，冷たいダークマターと無矛盾な結果を得ることができた．また構造形成の非線形段階に現れるシェルクロッシングと呼ばれるコールドダークマター特有の現象をラグランジェ摂動論を用いて記述することに成功した他，原始ブラックホールがダークマターとなるシナリオに関してその生成機構を詳細に調べたり，アクシオンダークマターの基礎となるPeccei-Quinn対称性に対する新しい理解を得るなど着実に成果を上げている．

Strategy for Future Research Activity

川崎はバリオン等曲率揺らぎに関して、その生成メカニズムとそれが原始ブラックホールを生成する可能性や宇宙初期の軽元素合成に与える影響を調べる。樽家はコールドダークマター優勢宇宙における構造形成の精密理論構築に向け、新しい計算手法の開発を引き続き進める。特に、３次元重力系で起こるシェルクロッシング後の現象を解析的に記述する手法を模索するとともに、N体シミュレーションをもとにダークマターハローの位相空間構造を明らかにし、より精密なコールドダークマターの検証方法を探求する。郡はガンマ線の次世代実験であるCTA計画では、我々の銀河に付随するdwarf galaxyの内部で起こると期待されるダークマターの対消滅もしくは崩壊に起因するガンマ線の空間分布を検出することが期待されている。その観測と比べられる理論テンプレートの製作の準備を行う。伊部はゲージ対称性に基づく Peccei-Quinn 機構に関する発展として axion 暗黒物質や domain wall 問題、その他宇宙論との整合性を考察していくことを計画している。千葉は引き続き矮小銀河の探査を行って、その発見率の統計を高めるとともに、個々の矮小銀河の暗黒物質分布を求めるための観測とその解析を進める。横崎は超対称性を破る場のシフトに対して不変な理論は、超対称性理論に伴うCP問題を解決することが出来る。この理論において、超対称性を破る場は自然にQCDアクシオンを含む。この理論に基づき、アクシオンや超対称性粒子に対する宇宙論的・実験的制限を明らかにする。高橋は研究の総括をするとともに，ダークマターの様々な模型構築および制限を導くほか，加速宇宙の謎の解明に向けて他計画研究班との研究協力に尽力する，

Research Products

• [Int'l Joint Research] プリンストン大学/カリフォルニア工科大学/ジョンズ・ホプキンス大学(アメリカ)
• [Int'l Joint Research] 上海天文台/IHEP(中国)
• [Int'l Joint Research] 中央研究所天文及天文物理研究所(台湾)
• [Int'l Joint Research] KASI(韓国)
• [Int'l Joint Research] IAP/Paris Observatory(フランス)
• [Int'l Joint Research]
• [Int'l Joint Research] IBS/Pusan University/APCTP(大韓民国)
• [Int'l Joint Research] Pusan University(韓国)
• [Journal Article] The ALP miracle revisited (2018)
  • Author(s): Daido Ryuji、Takahashi Fuminobu、Yin Wen
  • Journal Title: Journal of High Energy Physics Volume: 02 Pages: 104-104
  • DOI: 10.1007/jhep02(2018)104
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Adiabatic suppression of the axion abundance and isocurvature due to coupling to hidden monopoles, (2018)
  • Author(s): Masahiro KawasakiFuminobu TakahashiMasaki Yamada
  • Journal Title: JHEP Volume: 01 Pages: 53-53
  • DOI: 10.1007/jhep01(2018)053
  • Peer Reviewed / Open Access
• [Journal Article] Metallicity Distribution of Disk Stars and the Formation History of the Milky Way (2018)
  • Author(s): Toyouchi Daisuke、Chiba Masashi
  • Journal Title: Astrophysical Journal Volume: 855 Pages: 104-104
  • DOI: 10.3847/1538-4357/aab044
  • Peer Reviewed / Open Access
• [Journal Article] Searches for new Milky Way satellites from the first two years of data of the Subaru/Hyper Suprime-Cam survey: Discovery of Cetus III (2018)
  • Author(s): D.Homma, M.Chiba, S. Okamoto, Y.Komiyama,M.Tanaka, M.Ishigaki, K.Hayashi, N.Arimoto et al.
  • Journal Title: PASJ Volume: 70 Pages: 1-12
  • DOI: 10.1093/pasj/psx050
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Stellar Stream and Halo Structure in the Andromeda Galaxy from a Subaru/Hyper Suprime-Cam Survey (2018)
  • Author(s): Komiyama, Yutaka; Chiba, Masashi; Tanaka, Mikito; Tanaka, Masayuki; Kirihara, Takanobu; Miki, Yohei; Mori, Masao; Lupton, Robert H.; Guhathakurta, Puragra; Kalirai, Jason S.; Gilbert, Karoline; Kirby, Evan; Lee, Myun Gyoon; Jang, In Sung; Sharma, Sanjib; Hayashi, Kohei
  • Journal Title: Astrophysical Journal Volume: 853 Pages: 29-29
  • DOI: 10.3847/1538-4357/aaa129
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Migdal Effect in Dark Matter Direct Detection Experiments (2018)
  • Author(s): Masahiro Ibe, Wakutaka Nakano, Yutaro Shoji, Kazumine Suzuki
  • Journal Title: Journal of High Energy Physics Volume: 03 Pages: 194-194
  • DOI: 10.1007/jhep03(2018)194
  • Peer Reviewed / Open Access
• [Journal Article] Enhanced axion-photon coupling in GUT with hidden photon (2018)
  • Author(s): Daido Ryuji、Takahashi Fuminobu、Yokozaki Norimi
  • Journal Title: Physics Letters Volume: 780 Pages: 538-542
  • DOI: 10.1016/j.physletb.2018.03.039
  • Peer Reviewed / Open Access
• [Journal Article] Constraints on small-scale primordial power by annihilation signals from extragalactic dark matter minihalos (2018)
  • Author(s): Tomohiro Nakama, Teruaki Suyama, Kazunori Kohri, and Nagisa Hiroshima
  • Journal Title: Physical Review D Volume: 97 Pages: 023539-023539
  • DOI: 10.1103/physrevd.97.023539
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Revisiting Big-Bang Nucleosynthesis Constraints on Long-Lived Decaying Particles (2018)
  • Author(s): Kawasaki Masahiro、Kohri Kazunori、Moroi Takeo、Takaesu Yoshitaro
  • Journal Title: Phys. Rev. Volume: 97 Pages: 023502-023502
  • DOI: 10.1103/physrevd.97.023502
  • Peer Reviewed / Open Access
• [Journal Article] High-energy Neutrinos from Multi-body Decaying Dark Matter (2018)
  • Author(s): Hiroshima Nagisa、Kitano Ryuichiro、Kohri Kazunori、Murase Kohta
  • Journal Title: Physical Review D Volume: 97 Pages: 023006-023006
  • DOI: 10.1103/physrevd.97.023006
  • NAID: 120006457176
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] O(10) solarmass primordial black holes and string axion dark matter (2018)
  • Author(s): Inomata Keisuke、Kawasaki Masahiro、Mukaida Kyohei、Tada Yuichiro、Yanagida Tsutomu T.
  • Journal Title: Phys. Rev. D Volume: 96 Pages: 123527-123527
  • DOI: 10.1103/physrevd.96.123527
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Double inflation as a single origin of primordial black holes for all dark matter and LIGO observations (2018)
  • Author(s): Inomata Keisuke、Kawasaki Masahiro、Mukaida Kyohei、Yanagida Tsutomu T.
  • Journal Title: Phys. Rev. D Volume: 97 Pages: 043514-043514
  • DOI: 10.1103/physrevd.97.043514
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Gravitational waves from domain walls and their implications (2017)
  • Author(s): Nakayama Kazunori、Takahashi Fuminobu、Yokozaki Norimi
  • Journal Title: Physics Letters Volume: 770 Pages: 500-506
  • DOI: 10.1016/j.physletb.2017.05.010
  • Peer Reviewed / Open Access
• [Journal Article] The sign of the dipole-dipole potential by axion exchange (2017)
  • Author(s): Daido Ryuji、Takahashi Fuminobu
  • Journal Title: Physics Letters B Volume: 772 Pages: 127-129
  • DOI: 10.1016/j.physletb.2017.06.027
  • Peer Reviewed / Open Access
• [Journal Article] Gauge coupling unification with hidden photon, and minicharged dark matter (2017)
  • Author(s): R. Daido, F. Takahashi and N. Yokozak
  • Journal Title: Physics Letters B Volume: 768 Pages: 30-30
  • DOI: 10.1016/j.physletb.2017.01.085
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] The ALP miracle: unified inflaton and dark matter (2017)
  • Author(s): Daido Ryuji、Takahashi Fuminobu、Yin Wen
  • Journal Title: Journal of Cosmology and Astroparticle Physics Volume: 05 Pages: 044-044
  • DOI: 10.1088/1475-7516/2017/05/044
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Precision cosmology with redshift-space bispectrum: A perturbation theory based model at one-loop order (2017)
  • Author(s): Ichihiko Hashimoto, Yann Rasera, and Atsushi Taruya
  • Journal Title: Physical Review D Volume: 96 Pages: 043526-043526
  • DOI: 10.1103/physrevd.96.043526
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Moving around the cosmological parameter space: A nonlinear power spectrum reconstruction based on high-resolution cosmic responses (2017)
  • Author(s): Nishimichi Takahiro、Bernardeau Francis、Taruya Atsushi
  • Journal Title: Physical Review D Volume: 96 Pages: 123515-123515
  • DOI: 10.1103/physrevd.96.123515
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Post-collapse perturbation theory in 1D cosmology ? beyond shell-crossing (2017)
  • Author(s): Taruya Atsushi、Colombi Stphane
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume: 470 Pages: 4858-4884
  • DOI: 10.1093/mnras/stx1501
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Universal Dark Halo Scaling Relation for the Dwarf Spheroidal Satellites (2017)
  • Author(s): Hayashi Kohei、Ishiyama Tomoaki、Ogiya Go、Chiba Masashi、Inoue Shigeki、Mori Masao
  • Journal Title: Astrophysical Journal Volume: 843 Pages: 97-106
  • DOI: 10.3847/1538-4357/aa74d9
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Resolved Stellar Streams around NGC 4631 from a Subaru/Hyper Suprime-Cam Survey (2017)
  • Author(s): Tanaka Mikito、Chiba Masashi、Komiyama Yutaka
  • Journal Title: The Astrophysical Journal Volume: 842 Pages: 127-127
  • DOI: 10.3847/1538-4357/aa6d11
  • Peer Reviewed / Open Access
• [Journal Article] Dynamical clockwork axions (2017)
  • Author(s): Rupert Coy,Michele Frigerio and Masahiro Ibe
  • Journal Title: Journal of High Energy Physics Volume: 10 Pages: 002-002
  • DOI: 10.1007/jhep10(2017)002
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] A “gauged” U (1) Peccei-Quinn symmetry (2017)
  • Author(s): Fukuda Hajime、Ibe Masahiro、Suzuki Motoo、Yanagida Tsutomu T.
  • Journal Title: Physics Letters Volume: 771 Pages: 327-331
  • DOI: 10.1016/j.physletb.2017.05.071
  • Peer Reviewed
• [Journal Article] Dark matter candidates in a visible heavy QCD axion model (2017)
  • Author(s): Hajime Fukuda, Masahiro Ibe, and Tsutomu T. Yanagida
  • Journal Title: Physical Review D Volume: 95 Pages: 095017-095017
  • DOI: 10.1103/physrevd.95.095017
  • Peer Reviewed
• [Journal Article] CMB bounds on disk-accreting massive Primordial Black Holes (2017)
  • Author(s): Vivian Poulin, Pasquale D. Serpico, Francesca Calore, Sebastien Clesse, and Kazunori Kohri
  • Journal Title: Physical Review D Volume: 96 Pages: 083524-083524
  • DOI: 10.1103/physrevd.96.083524
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Spins of primordial black holes formed in the matter-dominated phase of the Universe (2017)
  • Author(s): Tomohiro Harada, Chul-Moon Yoo, Kazunori Kohri, Ken-ichi Nakao
  • Journal Title: Physical Review D Volume: 96 Pages: 083517-083517
  • DOI: 10.1103/physrevd.96.083517
  • Peer Reviewed / Open Access
• [Journal Article] Can decaying particle explain cosmic infrared background excess? (2017)
  • Author(s): Kohri Kazunori、Moroi Takeo、Nakayama Kazunori
  • Journal Title: Phys.Lett.B Volume: 772 Pages: 628-633
  • DOI: 10.1016/j.physletb.2017.07.026
  • Peer Reviewed / Open Access
• [Journal Article] Multi-field effects in a simple extension of R2 inflation (2017)
  • Author(s): Mori Taro、Kohri Kazunori、White Jonathan
  • Journal Title: Journal of Cosmology and Astroparticle Physics Volume: 2017 Pages: 044-044
  • DOI: 10.1088/1475-7516/2017/10/044
  • Peer Reviewed / Open Access
• [Journal Article] Axion-Like Particles and Recent Observations of the Cosmic Infrared Background Radiation (2017)
  • Author(s): Kazunori Kohri and Hideo Kodama
  • Journal Title: Physical Review D Volume: 96 Pages: 051701-051701
  • DOI: 10.1103/physrevd.96.051701
  • Peer Reviewed / Open Access
• [Journal Article] Constraints on long-lived electrically charged massive particles from anomalous strong lens systems (2017)
  • Author(s): Kamada Ayuki、Inoue Kaiki Taro、Kohri Kazunori、Takahashi Tomo
  • Journal Title: Journal of Cosmology and Astroparticle Physics Volume: 2017 Pages: 008-008
  • DOI: 10.1088/1475-7516/2017/11/008
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Cosmological constant problem and renormalized vacuum energy density in curved background (2017)
  • Author(s): Kohri Kazunori、Matsui Hiroki
  • Journal Title: Journal of Cosmology and Astroparticle Physics Volume: 2017 Pages: 006-006
  • DOI: 10.1088/1475-7516/2017/06/006
  • Peer Reviewed / Open Access
• [Journal Article] Inflationary primordial black holes for the LIGO gravitational wave events and pulsar timing array experiments. (2017)
  • Author(s): Inomata Keisuke、Kawasaki Masahiro、Mukaida Kyohei、Tada Yuichiro、Yanagida Tsutomu T.
  • Journal Title: PHYSICAL REVIEW D Volume: 95 Pages: 123510-123510
  • DOI: 10.1103/physrevd.95.123510
  • Peer Reviewed
• [Journal Article] Relaxation leptogenesis, isocurvature perturbations, and the cosmic infrared background (2017)
  • Author(s): Kawasaki Masahiro、Kusenko Alexander、Pearce Lauren、Yang Louis
  • Journal Title: Physical Review D Volume: 95 Pages: 103006-103006
  • DOI: 10.1103/physrevd.95.103006
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Inflationary Primordial Black Holes as All Dark Matter (2017)
  • Author(s): Inomata Keisuke、Kawasaki Masahiro、Mukaida Kyohei、Tada Yuichiro、Yanagida Tsutomu T.
  • Journal Title: Phys. Rev. D Volume: 96 Pages: 043504-043504
  • DOI: 10.1103/physrevd.96.043504
  • Peer Reviewed
• [Journal Article] New type of charged Q -ball dark matter in gauge mediated SUSY breaking models (2017)
  • Author(s): Hong Jeong-Pyong、Kawasaki Masahiro
  • Journal Title: Physical Review D Volume: 95 Pages: 123532-123532
  • DOI: 10.1103/physrevd.95.123532
  • Peer Reviewed
• [Journal Article] Gauged Q-ball decay rates into fermions (2017)
  • Author(s): Hong Jeong-Pyong、Kawasaki Masahiro
  • Journal Title: Physical Review D Volume: 96 Pages: 103526-103526
  • DOI: 10.1103/physrevd.96.103526
  • Peer Reviewed
• [Journal Article] Oscillating Affleck-Dine condensate and its cosmological implications (2017)
  • Author(s): Hasegawa Fuminori、Kawasaki Masahiro
  • Journal Title: Physical Review D Volume: 96 Pages: 063518-063518
  • DOI: 10.1103/physrevd.96.063518
  • Peer Reviewed
• [Journal Article] Consistency relations for large-scale structures with primordial non-Gaussianities (2017)
  • Author(s): P.~Valageas, A.~Taruya and T.~Nishimichi,
  • Journal Title: Physical Review D Volume: 95 Pages: 023504-023504
  • DOI: 10.1103/physrevd.95.023504
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Effects of electrically charged dark matter on cosmic microwave background anisotropies (2017)
  • Author(s): A.~Kamada, K.~Kohri, T.~Takahashi and N.~Yoshida
  • Journal Title: Physical Review D Volume: 95 Pages: 023502-023502
  • DOI: 10.1103/physrevd.95.023502
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Elucidating Dark Energy with Future 21 cm Observations at the Epoch of Reionization (2017)
  • Author(s): K.~Kohri, Y.~Oyama, T.~Sekiguchi and T.~Takahashi,
  • Journal Title: Journal of Cosmology and Astroparticle Physics Volume: 02 Pages: 024-024
  • DOI: 10.1088/1475-7516/2017/02/024
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Constructing perturbation theory kernels for large-scale structure in generalized cosmologies (2016)
  • Author(s): A.~Taruya
  • Journal Title: Physical Review D Volume: 94 Pages: 023504-023504
  • DOI: 10.1103/physrevd.94.023504
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Detecting Black-Hole Binary Clustering via the Second-Generation Gravitational-Wave Detectors (2016)
  • Author(s): T.~Namikawa, A.~Nishizawa and A.~Taruya,
  • Journal Title: Phys. Rev. D Volume: 94 Pages: 024013-024013
  • DOI: 10.1103/physrevd.94.024013
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] A New Milky Way Satellite Discovered In The Subaru/Hyper Suprime-Cam Survey (2016)
  • Author(s): Homma, D., China, M., Okamoto, S. et al.
  • Journal Title: The Astrophysical Journal Volume: 832 Pages: 21-21
  • DOI: 10.3847/0004-637x/832/1/21
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Evidence for a Dusty Dark Dwarf Galaxy in the Quadruple Lens MG 0414+0534 (2016)
  • Author(s): Inoue, K, T., Matsushita, S., Minezaki, T., Chiba, M.
  • Journal Title: Astrophysical Journal Volume: 835 Pages: 23-28
  • DOI: 10.3847/2041-8213/835/2/l23
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Charged Q-ball Dark Matter from B and L direction (2016)
  • Author(s): J.~P.~Hong, M.~Kawasaki and M.~Yamada,
  • Journal Title: Journal of Cosmology and Astroparticle Physics Volume: 08 Pages: 053-053
  • DOI: 10.1088/1475-7516/2016/08/053
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Revisiting constraints on small scale perturbations from big-bang nucleosynthesis (2016)
  • Author(s): K.~Inomata, M.~Kawasaki and Y.~Tada,
  • Journal Title: Physical Review D Volume: 94 Pages: 043527-043527
  • DOI: 10.1103/physrevd.94.043527
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Primordial black holes as dark matter in supergravity inflation models. (2016)
  • Author(s): M.~Kawasaki, A.~Kusenko, Y.~Tada and T.~T.~Yanagida,
  • Journal Title: Physical Review Volume: 94 Pages: 083523-083523
  • DOI: 10.1103/physrevd.94.083523
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Primordial black hole formation in the matter-dominated phase of the Universe (2016)
  • Author(s): T.~Harada, C.~M.~Yoo, K.~Kohri, K.~i.~Nakao and S.~Jhingan
  • Journal Title: Astrophys. J. Volume: 833 Pages: 1-61
  • DOI: 10.3847/1538-4357/833/1/61
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Topological Defects and nano-Hz Gravitational Waves in Aligned Axion Models, (2016)
  • Author(s): Higaki, Tetsutaro and Jeong, Kwang Sik and Kitajima, Naoya and Sekiguchi, Toyokazu and Takahashi, Fuminobu
  • Journal Title: Journal of High Energy Physics Volume: 08 Pages: 044-044
  • DOI: 10.1007/jhep08(2016)044
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Viable Chaotic Inflation as a Source of Neutrino Masses and Leptogenesis (2016)
  • Author(s): K.Nakayama, F.Takahashi, T.T.Yanagida
  • Journal Title: Physics Letters Volume: 757 Pages: 32-28
  • DOI: 10.1016/j.physletb.2016.03.051
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Diphoton excess from hidden U(1) gauge symmetry with large kinetic mixing (2016)
  • Author(s): F.~Takahashi, M.~Yamada and N.~Yokozaki
  • Journal Title: Physics Letter B Volume: 760 Pages: 013-013
  • DOI: 10.1016/j.physletb.2016.07.013
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Spontaneous Baryogenesis from Asymmetric Inflaton (2016)
  • Author(s): F. Takahashi and M. Yamada
  • Journal Title: Physics Letters Volume: 756 Pages: 216-216
  • DOI: 10.1016/j.physletb.2016.03.020
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Suppressing the QCD Axion Abundance by Hidden Monopoles (2016)
  • Author(s): M. Kawasaki, F. Takahashi and M. Yamada
  • Journal Title: Physics letter B Volume: 753 Pages: 677-677
  • DOI: 10.1016/j.physletb.2015.12.075
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] The QCD Axion from Aligned Axions and Diphoton Excess (2016)
  • Author(s): T. Higaki, K. S. Jeong, N. Kitajima and F. Takahashi,
  • Journal Title: Physics Letters Volume: 755 Pages: 13-13
  • DOI: 10.1016/j.physletb.2016.01.055
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Revisiting Big-Bang Nucleosynthesis Constraints on Dark-Matter Annihilation (2016)
  • Author(s): M. Kawasaki, K. Kohri, T. Moroi and Y. Takaesu
  • Journal Title: Phys. Lett. B Volume: 751 Pages: 246-246
  • DOI: 10.1016/j.physletb.2015.10.048
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] CMB constraint on dark matter annihilation after Planck 2015 (2016)
  • Author(s): M.Kawasaki, K.Nakayama, T.Sekiguchi
  • Journal Title: Physics Letter B Volume: 756 Pages: 212-212
  • DOI: 10.1016/j.physletb.2016.03.005
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Constraints on the neutrino parameters by future cosmological 21 cm line and precise CMB polarization observations (2016)
  • Author(s): Y. Oyama, K. Kohri, M. Hazumi
  • Journal Title: JCAP Volume: 1602 Pages: 008-008
  • DOI: 10.1088/1475-7516/2016/02/008
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Anisotropies of gravitational-wave standard sirens as a new cosmological probe without redshift information (2016)
  • Author(s): T.~Namikawa, A.~Nishizawa, and A.~Taruya,
  • Journal Title: Physical Review Letters Volume: 116 Pages: 121302-121302
  • DOI: 10.1103/physrevlett.116.121302
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Dynamics of Peccei-Quinn Breaking Field after Inflation and Axion Isocurvature Perturbations. (2015)
  • Author(s): K. Harigaya, M. Ibe, M. Kawasaki and T. T. Yanagida
  • Journal Title: JHEP Volume: 1511 Pages: 003-003
  • DOI: 10.1088/1475-7516/2015/11/003
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Structural Properties of Non-spherical Dark Halos in Milky Way … (2015)
  • Author(s): K.~Hayashi, M.~Chiba,
  • Journal Title: Structural properties of dark halos in the Milky Way and Andromeda dwarf spheroidal galaxies Volume: 810 Pages: 1-17
  • DOI: 10.1088/0004-637x/810/1/22
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Gas Inflow and Outflow Histories in Disk Galaxies ... (2015)
  • Author(s): D.~Toyouchi, M.~Chiba
  • Journal Title: The Astrophysical Journal Volume: 810 Pages: 1-11
  • DOI: 10.1088/0004-637x/810/1/18
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Presentation] すばるPFSが拓く近傍宇宙論と銀河暗黒物質の正体の解明 (2018)
  • Author(s): 千葉柾司
  • Organizer: 日本天文学会春季年会
  • Invited
• [Presentation] Nonlinear structure formation in cold dark matter cosmology (2018)
  • Author(s): Atsushi Taruya
  • Organizer: Innovative area symposium
  • Int'l Joint Research / Invited
• [Presentation] Grid-based calculation for perturbation theory of large-scale structure (2018)
  • Author(s): Atsushi Taruya
  • Organizer: 天文学会春の年会
• [Presentation] Formation of primordial black holes in multi-field inflation models (2018)
  • Author(s): Masahiro Kawasaki
  • Organizer: 14th Interational Conference of Computational Method in Science and Engineering
  • Int'l Joint Research / Invited
• [Presentation] Galactic Archaeology (2017)
  • Author(s): 千葉柾司
  • Organizer: PFS Collaboration Meeting
  • Int'l Joint Research / Invited
• [Presentation] Novel scheme for perturbation theory calculation of large-scale structure (2017)
  • Author(s): 樽家篤史
  • Organizer: One day workshop on modified gravity and large-scale structure 2017
  • Int'l Joint Research / Invited
• [Presentation] Challenges in perturbation theory calculation of large-scale structure (2017)
  • Author(s): 樽家篤史
  • Organizer: Cosmological Quest for the Next Decade
  • Int'l Joint Research / Invited
• [Presentation] Relativistic distortions of large-scale structure (2017)
  • Author(s): 樽家篤史
  • Organizer: The 3rd CosKASI-ICG-NAOC-YITP joint workshop
  • Int'l Joint Research
• [Presentation] 大規模構造で探る宇宙と摂動論 (2017)
  • Author(s): 樽家篤史
  • Organizer: 物理学会秋季大会
  • Invited
• [Presentation] 宇宙の大規模構造の記述：観測から理論まで (2017)
  • Author(s): 樽家篤史
  • Organizer: 研究会「生物から宇宙までの非線形現象」
• [Presentation] Relativistic distortions of large-scale structure (2017)
  • Author(s): 樽家篤史
  • Organizer: KIAS-YITP joint workshop
  • Int'l Joint Research / Invited
• [Presentation] Perturbative description of Vlasov-Poisson system in cosmology (2017)
  • Author(s): Atsushi Taruya
  • Organizer: Collisionless Boltzmann (Vlasov) Equation and Modeling of Self-Gravitating systems and Plasmas
  • Int'l Joint Research / Invited
• [Presentation] 理研シンポ・iTHES/iTHEMS研究会「非平衡物理の最前線」 (2017)
  • Author(s): Atsushi Taruya
  • Organizer: 2017
  • Invited
• [Presentation] Primordial black holes in multi-field inflation models (2017)
  • Author(s): Masahiro Kawasaki
  • Organizer: PASCOS 2017
  • Int'l Joint Research
• [Presentation] Cosmological problems of QCD axion (2017)
  • Author(s): Masahiro Kawasaki
  • Organizer: International workshop on "Axion physics and dark matter cosmology
  • Int'l Joint Research / Invited
• [Presentation] The ALP miracle (2017)
  • Author(s): Fuminobu Takahashi
  • Organizer: 7th General IAXO Collaboration Meeting
  • Int'l Joint Research / Invited
• [Presentation] The ALP miracle: axionic unification of inflation and dark matter (2017)
  • Author(s): Fuminobu Takahashi
  • Organizer: Post-inflationary String Cosmology
  • Int'l Joint Research / Invited
• [Presentation] Axions (2017)
  • Author(s): Fuminobu Takahashi
  • Organizer: ダークマター研究会
  • Invited
• [Presentation] Axions (2017)
  • Author(s): Fuminobu Takahashi
  • Organizer: 10th Anniversary Symposium of IPMU
  • Int'l Joint Research / Invited
• [Presentation] Cosmological evolution of axion and hidden sector (2017)
  • Author(s): Fuminobu Takahashi
  • Organizer: Axion physics and dark matter cosmology
  • Int'l Joint Research / Invited
• [Presentation] Production of primordial black holes in the inflationary universe (2017)
  • Author(s): 川崎 雅裕
  • Organizer: Physics in LHC and the early universe
  • Place of Presentation: 東京大学（東京都文京区）
  • Int'l Joint Research / Invited
• [Presentation] Dark matter on small scales - dwarf galaxies and J-factor (2017)
  • Author(s): 千葉柾司
  • Organizer: 新学術領域シンポジウム
  • Place of Presentation: 高エネルギー加速器研究機構
  • Int'l Joint Research / Invited
• [Presentation] Cosmological roles of axions within the reach of future experiments (2017)
  • Author(s): 高橋 史宜
  • Organizer: CERN-EPFL-Korea Theory Institute “New Physics at the Intensity Frontier”
  • Place of Presentation: CERN、ジュネーブ（スイス）
  • Int'l Joint Research / Invited
• [Presentation] Gauge Coupling Unification with Hidden Photon and Minicharged Dark Matter (2017)
  • Author(s): 横崎 統三
  • Organizer: III Saha Theory Workshop: Aspects of Early Universe Cosmology
  • Place of Presentation: Saha Institute of Nuclear Physics, India
  • Int'l Joint Research
• [Presentation] Formation of primordial black holes in double inflation (2016)
  • Author(s): 川崎 雅裕
  • Organizer: Particle Astrophysics and Cosmology Including Fundamental Interactions
  • Place of Presentation: Moorea, French Polynesia
  • Int'l Joint Research / Invited
• [Presentation] 近傍宇宙論：恒星系の化学動力学から探る銀河形成と進化 (2016)
  • Author(s): 千葉柾司
  • Organizer: 理論懇シンポジウム
  • Place of Presentation: 東北大学（宮城県仙台市）
  • Invited
• [Presentation] Redshift-space distortions as a probe of gravity (2016)
  • Author(s): 樽家 篤史
  • Organizer: Nonlinear evolution of the LSS of the Universe: Theory meets Expectations
  • Place of Presentation: Institut d'Astrophysique de Paris、フランス
  • Int'l Joint Research / Invited
• [Presentation] Gravitational waves and structure formation (2016)
  • Author(s): 樽家 篤史
  • Organizer: Gravitational waves and cosmology & 3rd eLISA cosmology working group workshop
  • Place of Presentation: DESY、ハンブルク（ドイツ）
  • Int'l Joint Research / Invited
• [Presentation] Higgs vacuum metastability in inflation, preheating, and reheating (2016)
  • Author(s): 郡 和範
  • Organizer: The First KEK-KIAS-NCTS Joint Workshop on Particle Physics Phenomenology
  • Place of Presentation: NCTS, Hsinchu, Taiwan
  • Int'l Joint Research / Invited
• [Presentation] Dark matter in cosmology (2016)
  • Author(s): 郡 和範
  • Organizer: DBD16 workshop
  • Place of Presentation: 大阪大学吹田キャンパス（大阪府吹田市）
  • Int'l Joint Research / Invited
• [Presentation] Axions (2016)
  • Author(s): 高橋 史宜
  • Organizer: Invisibles 16
  • Place of Presentation: Padova（イタリア）
  • Int'l Joint Research / Invited
• [Presentation] Post-collapse perturbation theory in 1D cosmology (2016)
  • Author(s): 樽家篤史
  • Organizer: 日本天文学会春季年会
  • Place of Presentation: 首都大学東京（東京都，八王子）
  • Year and Date: 2016-03-16
• [Presentation] Big bang nucleosynthesis and particle physics (2016)
  • Author(s): 川崎雅裕
  • Organizer: New Generation Quantum Theory
  • Place of Presentation: 京都大学（京都府，京都市）
  • Year and Date: 2016-03-08
  • Int'l Joint Research / Invited
• [Presentation] Cosmology with large-scale structure of the Universe (2016)
  • Author(s): 樽家篤史
  • Organizer: New generation quantum theory
  • Place of Presentation: 京都大学工学部（京都府，京都市）
  • Year and Date: 2016-03-08
  • Invited
• [Presentation] A model of heavy QCD axion (2016)
  • Author(s): 伊部昌宏
  • Organizer: Beyond the Standard Model in Okinawa 2016
  • Place of Presentation: 沖縄科学技術大学（沖縄県，国頭郡）
  • Year and Date: 2016-03-07
  • Int'l Joint Research / Invited
• [Presentation] Updates from Local Group/GA WG (2016)
  • Author(s): 千葉柾司
  • Organizer: Subaru HSC Survey Collaboration Meeting
  • Place of Presentation: 台湾中央研究院天文及天文物理研究所（台湾）
  • Year and Date: 2016-01-15
  • Int'l Joint Research / Invited
• [Presentation] Galactic Archaeology (2015)
  • Author(s): 千葉柾司
  • Organizer: Subaru PFS Collaboration Meeting
  • Place of Presentation: マルセイユ天体物理研究所（フランス）
  • Year and Date: 2015-12-16
  • Int'l Joint Research / Invited
• [Presentation] Reinterpretation of the Starobinsky-type inflation models (2015)
  • Author(s): 郡 和範
  • Organizer: LeCosPA
  • Place of Presentation: National Taiwan University（台湾）
  • Year and Date: 2015-12-15
  • Int'l Joint Research / Invited
• [Presentation] Why do we need dr < 0.001 (Lyth bounds etc.) (2015)
  • Author(s): 郡 和範
  • Organizer: B-mode from Space
  • Place of Presentation: IPMU、東大柏キャンパス（千葉県，柏市）
  • Year and Date: 2015-12-10
  • Int'l Joint Research / Invited
• [Presentation] Axion cosmology - The Witten effect and mixings - (2015)
  • Author(s): 高橋史宜
  • Organizer: Particle Cosmology and beyond 2015
  • Place of Presentation: 金沢大学（石川県，金沢市）
  • Year and Date: 2015-11-19
  • Int'l Joint Research / Invited
• [Presentation] Disappearing Inflaton Potential (2015)
  • Author(s): 高橋史宜
  • Organizer: CosPA2015
  • Place of Presentation: IBS, Daejeong, Korea
  • Year and Date: 2015-10-12
  • Int'l Joint Research / Invited
• [Presentation] Particle physics theory: Cosmology (2015)
  • Author(s): 郡 和範
  • Organizer: The 4th Particle Physics School in South-East Asia
  • Place of Presentation: Vietnam National University of Science、ハノイ、ベトナム
  • Year and Date: 2015-09-17
  • Int'l Joint Research / Invited
• [Presentation] A novel scheme for perturbation theory calculation of large-scale structure (2015)
  • Author(s): 樽家篤史
  • Organizer: Theoretical and Observational Progress on Large-sacle Structure
  • Place of Presentation: 欧州南天文台本部、ガルヒング
  • Year and Date: 2015-07-22
  • Int'l Joint Research
• [Book] 宇宙はどのような時空でできているのか (2016)
  • Author(s): 郡 和範
  • Total Pages: 288
  • Publisher: ベレ出版
• [Remarks] 研究成果】大統一理論の新しい枠組み ～微細電荷を持った暗黒物質の予言～
  • URL: http://www.sci.tohoku.ac.jp/news/20170529-9121.html
• [Remarks] アクシオンと宇宙論：共鳴現象による位相欠陥生成
  • URL: http://www.phys.tohoku.ac.jp/topics/topics-468/
• [Funded Workshop] KEK-Cosmo 2017 workshop, ``Fundamental Physics in the Universe'' (2017)
  • Place of Presentation: KEK つくばキャンパス
  • Year and Date: 2017-02-20