The primordial magnetic field fluctuations, its evolution and the impact on Big-bang nucleosynthesis

原初磁场涨落、演化及其对大爆炸核合成的影响

• 批准号: 19J22167
• 负责人: LUO Yudong
• 金额: $ 1.6万
• 依托单位: National Astronomical Observatory of Japan (2020-2021)The University of Tokyo (2019)
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for JSPS Fellows
• 财政年份: 2019
• 资助国家: 日本
• 起止时间: 2019-04-25 至 2022-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-19J22167/
• 关键词: Primordial Black hole; r-process; Big Bang Nucleosynthesis; Magnetic Field; Screening effect

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.

在对电磁级联谱进行最精确的处理时，我将所有可行的光分解反应纳入其中，并将其与最新的截面数据相结合。我进行了精确的核合成计算，得到了所有暗物质组分中PBH分数的可靠约束。此外，研究了临界坍缩模型（即通过引力坍缩临界现象形成的pbh）中pbh的质量函数及其对3He丰度的影响。过去，人们认为临界坍缩质量函数实际上与单色质量函数难以区分。然而，我们发现在临界坍缩质量函数中，3He丰度对低质量尾中少量PBHs也很敏感，这表明核合成可以作为探测PBHs扩展质量函数的有力工具。这项研究发表在《宇宙学与天体物理学杂志》上。

项目成果

Nuclear Reaction Screening, Weak Interactions, and r-process Nucleosynthesis in High Magnetic Fields

高磁场中的核反应筛选、弱相互作用和 r 过程核合成

• DOI: 10.3847/1538-4357/aba04d
• 发表时间: 2020
• 期刊: The Astrophysical Journal
• 作者: Famiano, Michael;Balantekin, A. Baha;Kajino, T.;Kusakabe, M.;Mori, K.;Luo, Y.
• 通讯作者: Luo, Y.

Screening corrections to electron capture rates and resulting constraints on primordial magnetic fields

对电子捕获率的筛选校正以及由此产生的对原始磁场的限制

• DOI: 10.1103/physrevd.101.083010
• 发表时间: 2020
• 期刊: Physical Review D
• 影响因子: 5
• 作者: Luo, Yudong;Famiano, Michael A.;Kajino, Toshitaka;Kusakabe, Motohiko;Balantekin, A. Baha
• 通讯作者: Balantekin, A. Baha

Primordial Magnetic Field and Its Impact on Primordial Nucleosynthesis

原始磁场及其对原始核合成的影响

• DOI: 10.7566/jpscp.31.011042
• 发表时间: 2020
• 期刊: JPS Conference Proceedings,
• 作者: Luo Yudong;Kajino Toshitaka;Kusakabe Motohiko;Mathews Grant. J.
• 通讯作者: Mathews Grant. J.

Cosmological Solutions to the Lithium Problem

锂问题的宇宙学解决方案

• DOI: 10.7566/jpscp.31.011033
• 发表时间: 2020
• 期刊: JPS Conference Proceedings
• 作者: Mathews G. J.;Kedia A.;Sasankan N.;Kusakabe M.;Luo Y.;Kajino T.;Yamazaki D.;Makki T.;El Eid M.
• 通讯作者: El Eid M.

Can Inhomogeneous Primordial Magnetic Field Affect Nucleosynthesis in the Early Universe?

不均匀的原始磁场会影响早期宇宙的核合成吗？

• 发表时间: 2019
• 作者: Luo Yudong;Kajino Toshitaka;Kusakabe Motohiko;Mathews Grant J.;Yudong Luo;Yudong Luo;Yudong Luo
• 通讯作者: Yudong Luo