bbn简单:如何烤一个宇宙大小的蛋糕

IF 11.7 2区 物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS
Aidan Meador-Woodruff , Dragan Huterer
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引用次数: 0

摘要

大爆炸核合成(BBN)是早期宇宙中产生最轻元素的过程,是一个高度稳健、精确、最终成功的理论,它构成了标准热大爆炸宇宙模型的三大支柱之一。现有的理论处理BBN和相关的计算机代码是准确和灵活的,但通常是高度技术性和不透明的,不适合对BBN的教学理解。在这里,我们提出了BBN-simple -一个从头开始的最轻元素丰度的数值计算,适用于高级本科或研究生初级水平。我们回顾了与BBN相关的早期宇宙物理学,提供了有关反应速率的信息,并讨论了建立BBN计算所必需的计算数学背景。我们计算了标准宇宙学模型中主要核物质的丰度,并找到了与公共精度级BBN代码相当好的一致性。本文的精简版本和相关的计算机代码片段可在http://www-personal.umich.edu/~aidanmw/上找到。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
BBN-simple: How to bake a universe-sized cake
Big Bang Nucleosynthesis (BBN), the process of creation of lightest elements in the early universe, is a highly robust, precise, and ultimately successful theory that forms one of the three pillars of the standard hot-Big-Bang cosmological model. Existing theoretical treatments of BBN and the associated computer codes are accurate and flexible, but are typically highly technical and opaque, and not suitable for pedagogical understanding of the BBN. Here we present BBN-simple – a from-scratch numerical calculation of the lightest element abundances pitched at an advanced undergraduate or beginning graduate level. We review the physics of the early universe relevant for BBN, provide information about the reaction rates, and discuss computational-mathematics background that is essential in setting up a BBN calculation. We calculate the abundances of the principal nuclear species in a standard cosmological model, and find a reasonably good agreement with public precision-level BBN codes. A condensed version of this paper and associated snippets of computer code are given at http://www-personal.umich.edu/~aidanmw/.
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来源期刊
New Astronomy Reviews
New Astronomy Reviews 地学天文-天文与天体物理
CiteScore
18.60
自引率
1.70%
发文量
7
审稿时长
11.3 weeks
期刊介绍: New Astronomy Reviews publishes review articles in all fields of astronomy and astrophysics: theoretical, observational and instrumental. This international review journal is written for a broad audience of professional astronomers and astrophysicists. The journal covers solar physics, planetary systems, stellar, galactic and extra-galactic astronomy and astrophysics, as well as cosmology. New Astronomy Reviews is also open for proposals covering interdisciplinary and emerging topics such as astrobiology, astroparticle physics, and astrochemistry.
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