重力波で探る重力セクターでのパリティーの破れとアクシオンダークマター

• Project Area: Gravitational wave physics and astronomy: Genesis
• Project/Area Number: 18H04589
• Research Category: Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
• Allocation Type: Single-year Grants
• Research Institution: Kobe University
• Principal Investigator: 早田 次郎 神戸大学, 理学研究科, 教授 (00222076)
• Project Period (FY): 2018-04-01 – 2020-03-31
• Project Status: Completed (Fiscal Year 2019)
• Budget Amount: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000); Fiscal Year 2019: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2018: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
• Keywords: 重力波 / アクシオン / 共鳴 / 円偏極 / 光速からのずれ / パリティーの破れ / アクシオンダークマター / パラメータ共鳴 / チャーン・サイモン重力 / 暗黒物質

Outline of Annual Research Achievements

宇宙には、暗黒物質（DM）と呼ばれる見えない物質が存在し、その正体を解明することは宇宙論の大問題となっている。DMの候補として最近、軽い質量を持ったアクシオンDMの研究が重要となってきた。アクシオンDMの大きな特徴はアクシオン場のコヒーレントな振動にある。一方、重力波の直接観測が成功したことにより、重力波を用いたアインシュタイン重力を超える理論の探求は大きな課題となっている。ここではアクシオンとの結合が重要となるチャーン・サイモンズ重力理論に着目する。
本研究の目的は、チャーン・サイモンズ重力理論におけるブラックホール連星等からの重力波の伝搬がアクシオン振動との相互作用によってどのような影響を受けるのかを研究し、時空のパリティーを破れとアクシオンDMの証拠を明らかにすることである。

1. アクシオンDM環境における重力波伝搬を境界条件を考慮して解析し、結合定数の大きさについて重力波干渉計LIGOによってどれだけ制限できるのかを明らかにした。また、 アクシオンとの結合によって重力波の直線偏極が回転することを明らかにした。これは特に宇宙論的な重力波に関して重要となる。
2. アクシオンによる光速からのずれの観測が、アクシオンと重力波の結合定数やアクシオンの存在量に強い制限を与えることを明らかにした。
3. 放射優勢期において、アクシオン振動によるゲージ場の共鳴生成が円偏極した重力波を生成し、それが重力セクターのパリティーの破れを生み出すことを示した。

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] ソウル大学(韓国)
• [Journal Article] Probing GHz gravitational waves with graviton?magnon resonance (2020)
  • Author(s): Ito Asuka、Ikeda Tomonori、Miuchi Kentaro、Soda Jiro
  • Journal Title: The European Physical Journal C Volume: 80 Issue: 3 Pages: 179-179
  • DOI: 10.1140/epjc/s10052-020-7735-y
  • NAID: 120006823974
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Stability of axion dark matter-photon conversion (2020)
  • Author(s): Masaki Emi、Aoki Arata、Soda Jiro
  • Journal Title: Physical Review D Volume: 101 Issue: 4 Pages: 043505-043505
  • DOI: 10.1103/physrevd.101.043505
  • NAID: 120006796518
  • Peer Reviewed / Open Access
• [Journal Article] Detecting nonclassical primordial gravitational waves with Hanbury-Brown--Twiss interferometry (2019)
  • Author(s): Sugumi Kanno, Jiro Soda
  • Journal Title: Physical Review D Volume: 99 Issue: 8 Pages: 0840101-7
  • DOI: 10.1103/physrevd.99.084010
  • NAID: 120006715551
  • Peer Reviewed / Open Access
• [Journal Article] Dressed power-law inflation with a cuscuton (2019)
  • Author(s): Ito Asuka、Iyonaga Aya、Kim Suro、Soda Jiro
  • Journal Title: Physical Review D Volume: 99 Issue: 8 Pages: 083502-083502
  • DOI: 10.1103/physrevd.99.083502
  • NAID: 120006715553
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Accelerating universe with a stable extra dimension in cuscuton gravity (2019)
  • Author(s): Ito Asuka、Sakakihara Yuki、Soda Jiro
  • Journal Title: Physical Review D Volume: 100 Issue: 6 Pages: 063531-063531
  • DOI: 10.1103/physrevd.100.063531
  • NAID: 120006796519
  • Peer Reviewed / Open Access
• [Journal Article] Birth of de Sitter universe from a time crystal universe (2019)
  • Author(s): Yoshida Daisuke、Soda Jiro
  • Journal Title: Physical Review D Volume: 100 Issue: 12 Pages: 123531-123531
  • DOI: 10.1103/physrevd.100.123531
  • NAID: 120006796517
  • Peer Reviewed / Open Access
• [Journal Article] Searching for Bispectrum of Stochastic Gravitational Waves with Pulsar Timing Arrays (2019)
  • Author(s): Tsuneto Makoto、Ito Asuka、Noumi Toshifumi、Soda Jiro
  • Journal Title: Journal of Cosmology and Astroparticle Physics Volume: 1903 Issue: 03 Pages: 032-032
  • DOI: 10.1088/1475-7516/2019/03/032
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Quasinormal modes of p-forms in spherical black holes (2019)
  • Author(s): Yoshida Daiske、Soda Jiro
  • Journal Title: Physical Review D Volume: 99 Issue: 4 Pages: 044054-044054
  • DOI: 10.1103/physrevd.99.044054
  • NAID: 120006715550
  • Peer Reviewed / Open Access
• [Journal Article] Exploring the string axiverse and parity violation in gravity with gravitational waves (2018)
  • Author(s): Yoshida Daiske , Soda Jiro
  • Journal Title: International Journal of Modern Physics D Volume: - Issue: 09 Pages: 1850096-1850096
  • DOI: 10.1142/s0218271818500967
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Cosmological imprints of string axions in plateau (2018)
  • Author(s): Soda Jiro、Urakawa Yuko
  • Journal Title: The European Physical Journal C Volume: 78 Issue: 9 Pages: 779-779
  • DOI: 10.1140/epjc/s10052-018-6246-6
  • NAID: 120006529677
  • Peer Reviewed / Open Access
• [Journal Article] Electromagnetic waves propagating in the string axiverse (2018)
  • Author(s): Yoshida Daiske , Soda Jiro
  • Journal Title: Progress of Theoretical and Experimental Physics Volume: 2018 Issue: 4 Pages: 1-10
  • DOI: 10.1093/ptep/pty029
  • Peer Reviewed / Open Access
• [Journal Article] Anisotropic constant-roll Inflation (2018)
  • Author(s): Ito Asuka、Soda Jiro
  • Journal Title: The European Physical Journal C Volume: 78 Issue: 1 Pages: 1-6
  • DOI: 10.1140/epjc/s10052-018-5534-5
  • Peer Reviewed / Open Access
• [Journal Article] Conversion of gravitons into dark photons in cosmological dark magnetic fields (2018)
  • Author(s): Masaki Emi、Soda Jiro
  • Journal Title: Physical Review D Volume: 98 Issue: 2 Pages: 023540-023540
  • DOI: 10.1103/physrevd.98.023540
  • NAID: 120006501236
  • Peer Reviewed
• [Journal Article] Gravitational wave forest from string axiverse (2018)
  • Author(s): Kitajima Naoya、Soda Jiro、Urakawa Yuko
  • Journal Title: Journal of Cosmology and Astroparticle Physics Volume: 2018 Issue: 10 Pages: 008-008
  • DOI: 10.1088/1475-7516/2018/10/008
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Presentation] Probing ultralight vector dark matter (2020)
  • Author(s): Jiro Soda
  • Organizer: Dark Odyssey 2020
  • Int'l Joint Research / Invited
• [Presentation] Fun with a cuscuton (2019)
  • Author(s): Jiro Soda
  • Organizer: International workshop for String Theory and Cosmology
  • Int'l Joint Research / Invited
• [Presentation] Inflation with broken rotational symmetry and graviton statistics (2019)
  • Author(s): Jiro Soda
  • Organizer: Symmetry 2019
  • Int'l Joint Research / Invited
• [Presentation] Effective Field Theory of Anisotropic Inflation (2019)
  • Author(s): Jiro Soda
  • Organizer: 6th Korea-Japan workshop on dark energy at KMI
  • Int'l Joint Research / Invited
• [Presentation] Beyond anisotropic inflation (2019)
  • Author(s): Jiro Soda
  • Organizer: ACGRG 10
  • Int'l Joint Research
• [Presentation] Parity Violation in Gravity: probing with gravitational waves (2019)
  • Author(s): Jiro Soda
  • Organizer: Area workshop 2019 winter
  • Int'l Joint Research
• [Presentation] Detectability of gravitons with HBT interferometers (2019)
  • Author(s): Jiro Soda
  • Organizer: 新学術「加速宇宙」シンポジウム
  • Int'l Joint Research
• [Presentation] 原始重力波の量子コヒーレンス (2018)
  • Author(s): 早田次郎
  • Organizer: 研究会「量子情報と宇宙」
• [Presentation] Cosmological Bell Inequality and Entangled Quantum Vacuum (2018)
  • Author(s): Jiro Soda
  • Organizer: International workshop for String Theory and Cosmology
  • Int'l Joint Research / Invited
• [Presentation] Glauber in the Sky (2018)
  • Author(s): Jiro Soda
  • Organizer: The first NRF-JSPS workshop in particle physics,cosmology, and gravitation
  • Int'l Joint Research / Invited
• [Presentation] Gravitational wave forest from the string axiverse (2018)
  • Author(s): Jiro Soda
  • Organizer: SUSY 2018
  • Int'l Joint Research
• [Presentation] String Axions, Flapping resonance, and GW forest (2018)
  • Author(s): Jiro Soda
  • Organizer: 5th Korea-Japan workshop on dark energy
  • Int'l Joint Research / Invited
• [Presentation] Primordial Gravitational Waves (2018)
  • Author(s): Jiro Soda
  • Organizer: String axion workshop
  • Int'l Joint Research / Invited
• [Presentation] Nonclassicality of Primordial Gravitational Waves (2018)
  • Author(s): Jiro Soda
  • Organizer: 2nd annual area symposium
  • Int'l Joint Research
• [Presentation] 物理学は宇宙大規模構造の起源を明らかにできるか？ (2018)
  • Author(s): 早田次郎
  • Organizer: 理論懇シンポジウム
  • Invited