arXiv 1810.059762018-10astro-ph.CO

相对论电子散射与大爆炸核合成

Relativistic Electron Scattering and Big Bang Nucleosynthesis

Nishanth Sasankan, Atul Kedia, Motohiko Kusakabe, Grant J Mathews

备注：: 6 pages, 4 figures, this paper is superseded by arxiv:1911.07334
发表信息：: Phys. Rev. D 101, 123532 (2020)
DOI：: 10.1103/PhysRevD.101.123532

摘要：

本文由Arxiv：1911.07334取代。大爆炸核合成（BBN）是约束早期宇宙物理的一个有价值的工具，也是辐射主导时代的唯一探测器。BBN的一个基本假设是，核速度分布服从麦克斯韦-玻尔兹曼统计，就像它们在恒星中一样。然而，在这封信中，我们指出，恒星的反应速率和BBN的反应速率之间存在着根本的区别。具体来说，BBN时代的特点是由一个稀释的重子等离子体的速度分布的核主要是由占主导地位的库仑散射温和的相对论性电子。这改变了核速度分布，并显著改变了热核反应速率，从而改变了轻元素丰度。我们发现，这一新的结果改变了所有以前的计算轻元素丰度从BBN，并确实加剧了BBN和推断的原始轻元素丰度之间的差异可能表明需要在早期宇宙的新物理。

英文摘要：

This paper is superseded by Arxiv:1911.07334. Big-bang nucleosynthesis (BBN) is a valuable tool to constrain the physics of the early universe and is the only probe of the radiation-dominated epoch. A fundamental assumption in BBN is that the nuclear velocity distributions obey Maxwell-Boltzmann statistics as they do in stars. In this letter, however, we point out that there is a fundamental difference between stellar reaction rates and BBN reaction rates. Specifically, the BBN epoch is characterized by a dilute baryon plasma for which the velocity distribution of nuclei is mainly determined by the dominant Coulomb scattering with mildly relativistic electrons. This modifies the nuclear velocity distributions and significantly alters the thermonuclear reaction rates, and hence, the light-element abundances. We show that this novel result alters all previous calculations of light-element abundances from BBN, and indeed exacerbates the discrepancies between BBN and inferred primordial light-element abundances possibly suggesting the need for new physics in the early universe.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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