Deciphering string axiverse from multi-wavelength observations of gravitational waves

2022 Fiscal Year Final Research Report

• Project/Area Number: 19H01894
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 15010:Theoretical studies related to particle-, nuclear-, cosmic ray and astro-physics
• Research Institution: High Energy Accelerator Research Organization (2020-2022); Nagoya University (2019)
• Principal Investigator: Urakawa Yuko 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 (80580555)
• Co-Investigator(Kenkyū-buntansha): 北嶋 直弥 東北大学, 学際科学フロンティア研究所, 助教 (50737955) ; 西澤 篤志 東京大学, 大学院理学系研究科(理学部), 助教 (90569378)
• Project Period (FY): 2019-04-01 – 2023-03-31
• Keywords: アクシオン / 暗黒物質 / 重力波

Outline of Final Research Achievements

We have deepen the knowledge of the generation mechanism of the gravitational wave from axions (Fukunaga, Kitajima, Urakawa 19) (Patel, Tashiro, Urakawa 19) and found that the gravitational wave from axion dark matter is indeed detectable by SKA (Soda, Kitajima, Urakawa 21). Furthermore, as an unexpected achievement, we have found new properties of QCD axion (Kogai, Kitajima, Urakawa 22), and proposed a new method for investigating axion dark matter (Basu, Goswami, Schwarz, Urakawa 21), which was then implemented for actual observations.

Free Research Field

宇宙物理

Academic Significance and Societal Importance of the Research Achievements

アクシオン宇宙及びアクシオン暗黒物質の新たな探査方法の確立に向けて一定の役割を果たすことができた。