| 研究課題/領域番号 |
19J22167
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| 研究種目 |
特別研究員奨励費
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| 配分区分 | 補助金 |
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| 応募区分 | 国内 |
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| 審査区分 |
小区分15010:素粒子、原子核、宇宙線および宇宙物理に関連する理論
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| 研究機関 | 国立天文台 (2020-2021)
東京大学 (2019) |
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研究代表者 |
LUO Yudong 国立天文台, 科学研究部, 特別研究員(PD)
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| 研究期間 (年度) |
2019-04-25 – 2022-03-31
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| 研究課題ステータス |
完了 (2021年度)
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| 配分額 *注記 |
2,500千円 (直接経費: 2,500千円)
2021年度: 800千円 (直接経費: 800千円)
2020年度: 800千円 (直接経費: 800千円)
2019年度: 900千円 (直接経費: 900千円)
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| キーワード | Primordial Black hole / r-process / Big Bang Nucleosynthesis / Magnetic Field / Screening effect |
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| 研究開始時の研究の概要 |
In this project, we mainly focus on the fluctuated primordial magnetic field evolution and its impact on BBN. For the first time a comprehensive study of primordial nucleosynthesis with fluctuated PMF will be carried out. Especially a multi-zone BBN code with fluctuated PMF background will be developed to clarify the evolution of PMF and its interaction with particles. The results will lead to a systematic MHD (magneto-hydrodynamical) study in early universe, together with primordial elements observation and CMB spectrum, it will be used to constrain PMF generation mechanism and its evolution.
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| 研究実績の概要 |
In the most precise treatment of electromagnetic cascade spectrum, I included all feasible photodisintegration reactions and combine them with updated cross section data. I carried out accurate nucleosynthesis calculation and obtained a the reliable constraint on the PBH fraction among all dark matter component. Moreover, I investigated the mass function of PBHs in critical collapse model (i.e., PBHs formed via critical phenomena of gravitational collapse) and the impact on 3He abundance. In the past, the critical collapse mass function is thought of being practically indistinguishable from the monochromatic mass function. However, we show that the 3He abundance is sensitive to even small amounts of PBHs within the low-mass tail in the critical collapse mass function, which indicated that the nucleosynthesis can be a powerful tool to probe the extended mass function of PBHs. This work is publish on the Journal of Cosmology and Astrophysics.
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| 現在までの達成度 (段落) |
令和3年度が最終年度であるため、記入しない。
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| 今後の研究の推進方策 |
令和3年度が最終年度であるため、記入しない。
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