Probing warm dark matter with a magnetic moment

• Project/Area Number: 17K14269
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: The University of Tokyo
• Principal Investigator: Inada Toshiaki 東京大学, 素粒子物理国際研究センター, 特任研究員 (20779269)
• Project Period (FY): 2017-04-01 – 2019-03-31
• Project Status: Completed (Fiscal Year 2018)
• Budget Amount: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000); Fiscal Year 2018: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000); Fiscal Year 2017: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
• Keywords: 素粒子実験 / 暗黒物質 / 磁気モーメント / ファラデー回転 / スピンフィルタ / 光共振器 / パルス強磁場

Outline of Final Research Achievements

The main components of this experiments are the optics used to detect the small Faraday rotation signal from dark matter and a magnetic-field generation system. The long-term stability of the optical cavity is very important and the resistance to external disturbance has significantly been improved during this research period. Since the sensitivity to magnetic moments and dark matter mass is enhanced by using a strong magnetic field, a prototype magnet producing a peak field of about 20 T was developed. The calibration run using nitrogen gas showed the expected sensitivity and a pilot search has been made ready.

Academic Significance and Societal Importance of the Research Achievements

暗黒物質は全宇宙のエネルギー密度の27%を占め、銀河の回転速度、宇宙の大規模構造、宇宙背景輻射スペクトル、重力レンズ効果等の観測からその存在は揺るぎないものとなっている。しかし暗黒物質の質量や種々の量子数といった基本的な性質に加え、重力相互作用以外の、標準理論で記述される粒子との具体的な結合については明らかでない。精密光学系を駆使することで電磁場との結合を持つ軽質量の暗黒物質を探索可能であり、宇宙の進化や時空の構造に対する新たな知見となる。

Research Products

• [Journal Article] High magnetic fields for fundamental physics (2018)
  • Author(s): R. Battesti, J. Beard, S. Boser, N. Bruyant, D. Budker, S. A. Crooker, E. J.Daw, V. V.Flambaum, T. Inada, I. G. Irastorza, F. Karbstein, D. L. Kim, M. G.Kozlov, Z. Melhem, A. Phipps, P. Pugnat, G. Rikken, C. Rizzo, M. Schott, Y. K. Semertzidis, H. H. J. ten Kate, G. Zavattini
  • Journal Title: Physics Reports Volume: 765-766 Pages: 1-39
  • DOI: 10.1016/j.physrep.2018.07.005
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] First results from a hidden photon dark matter search in the meV sector using a plane-parabolic mirror system (2018)
  • Author(s): Knirck Stefan, Yamazaki Takayuki, Okesaku Yoshiki, Asai Shoji, Idehara Toshitaka, Inada Toshiaki
  • Journal Title: Journal of Cosmology and Astroparticle Physics Volume: 11 Issue: 11 Pages: 031-031
  • DOI: 10.1088/1475-7516/2018/11/031
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Probing Physics in Vacuum Using an X-ray Free-Electron Laser, a High-Power Laser, and a High-Field Magnet (2017)
  • Author(s): T. Inada, T. Yamazaki, T. Yamaji, Y. Seino, X. Fan, S. Kamioka, T. Namba, S. Asai
  • Journal Title: Applied Sciences Volume: 7 Issue: 7 Pages: 671-682
  • DOI: 10.3390/app7070671
  • Peer Reviewed / Open Access
• [Presentation] OVAL実験：パルス磁石と高フィネス共振器を用いた真空複屈折の探索 (2019)
  • Author(s): 上岡修星, 成田佳奈香, 稲田聡明, 難波俊雄, 浅井祥仁, 吉岡孝高, 五神真, 松尾晶, 金道浩一, 野尻浩之
  • Organizer: 日本物理学会第74回年次大会
• [Presentation] OVAL実験の感度の向上を目指した新型パルス磁石の考察 (2019)
  • Author(s): 成田佳奈香, 上岡修星, 稲田聡明, 難波俊雄, 浅井祥仁, 松尾晶, 金道浩一, 野尻浩之
  • Organizer: 日本物理学会第74回年次大会
• [Presentation] Far-Infrared Technologies in Axion and Hidden Photon Astroparticle Physics (2019)
  • Author(s): S. Knirck, T. Inada, T. Yamazaki
  • Organizer: International Workshop on Far-Infrared Technologies 2019
  • Int'l Joint Research / Invited
• [Presentation] Light-by-light scattering at SACLA/SPring-8 (2018)
  • Author(s): T. Inada
  • Organizer: Probing strong-field QED in electron-photon interactions
  • Int'l Joint Research / Invited
• [Presentation] LSW experiments with pulsed magnets + Vacuum Magnetic Birefringence (VMB) (2017)
  • Author(s): Toshiaki Inada
  • Organizer: Workshop on HIgh MAgnetic Fields for FUNdamental Physics (HIMAFUN)
  • Int'l Joint Research / Invited
• [Remarks] Tabletop Experiments
  • URL: https://tabletop.icepp.s.u-tokyo.ac.jp/Tabletop_experiments/Home.html