2020 Fiscal Year Final Research Report
A new approach for stability analysis of magnetized stars
| Project/Area Number |
18K03606
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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 | Tohoku University |
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Principal Investigator |
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| Project Period (FY) |
2018-04-01 – 2021-03-31
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| Keywords | 理論宇宙物理 |
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| Outline of Final Research Achievements |
The formulation for analyzing stability of magnetized stars are obtained. The formulation is based on a variational principle, which can be applied to a numerical approach with the finite element method. The construction of the numerical code for examining stabilities of magnetized stars is developed, although it is not finished yet.
Equilibrium states of magnetized stars, which are required for examining their stability, are studied. Main results are summarized as follows: (i) Stars containing magnetic fields whose toroidal components are much larger than the poloidal ones in general relativity are obtained. (ii) Considering general magnetic field structures, we obtain magnetized stars within the framework of general relativity. (iii) Magnetized stars surrounded by plasma are investigated. (iv) Effects of the surface current on the stellar surface on the structure of the star are studied.
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| Free Research Field |
宇宙物理
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| Academic Significance and Societal Importance of the Research Achievements |
コンパクト天体の磁場は、高エネルギー天体現象の最も重要な要素の一つであり、磁場無しでは多くの現象を説明できない。その一方で、コンパクト天体に存在する磁場が基本的には不安定であることが指摘されている。これが事実なら非常に深刻な問題であり、磁場を伴う星の安定性は、天体物理においで、重要な問題となる。しかし、今のところ、磁場星の安定性を解析する正確で有効な方法は知られていない。本研究課題では、磁場星の安定性を解析する数値解析方法を進展させたという意味で意義がある。最終的な成果は得られていないが、今後、研究を進めることで、最終的な成果が得られると期待される。
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