| Project/Area Number |
18K03654
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 15010:Theoretical studies related to particle-, nuclear-, cosmic ray and astro-physics
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| Research Institution | Osaka City University |
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Principal Investigator |
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| Project Period (FY) |
2018-04-01 – 2022-03-31
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| Project Status |
Completed (Fiscal Year 2021)
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| Budget Amount *help |
¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2020: ¥390,000 (Direct Cost: ¥300,000、Indirect Cost: ¥90,000)
Fiscal Year 2019: ¥390,000 (Direct Cost: ¥300,000、Indirect Cost: ¥90,000)
Fiscal Year 2018: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
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| Keywords | ブラックホール / 強重力 / アクシオン / 重力波 / 強重力場 / ブラックホール磁気圏 / 電磁放射 / 重力崩壊 / ブラックホール・アクシオン系の最終状態 |
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| Outline of Final Research Achievements |
The original aim of this research project was to clarify the behavior of axion field around a black hole, in particular, at the stage where the self-interaction effects become important after the growth of the superradiant instability. However, the time scale of the superradinat instability is extremely long, and it was difficult to proceed with this project by numerical simulations. For this reason, I included the clarification of the properties of gravitational field around black holes and observable phenomena into the plan. As a result, I have accomplished the research in the following issues: The optical image of a star under gravitational collapse, proposition a new concept to characterize the strength of gravity around a black hole, clarification of photon behavior at the distant region from a black hole, and the observability of gravitons generated by the photon-graviton conversion in black hole magnetospheres.
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| Academic Significance and Societal Importance of the Research Achievements |
ブラックホール周辺の観測が可能になってきた中で、それに関わる理論の基本的な概念の整備、将来観測にかかわる基礎的な研究成果を出すことができた。また、もともとのアクシオンのテーマでは成果が思うように出なかったが、次につながるステップを踏むことができた。
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