原始宇宙中的μ子丰度

IF 0.9 4区物理与天体物理 Q3 PHYSICS, MULTIDISCIPLINARY

Acta Physica Polonica B Pub Date : 2021-03-13 DOI:10.5506/APhysPolB.52.277

J. Rafelski, Cheng-Tao Yang

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引用次数: 3

摘要

μ介子丰度是理解关于原始宇宙性质的几个基本问题所必需的。在本文中，我们评估了宇宙等离子体中μ介子的产生和衰变率与温度的函数关系。这使我们能够确定μ介子丰度究竟何时消失。当宇宙冷却到$kT_\mathrm｛消失｝约4.135$MeV的温度以下时，μ介子的衰变率超过了产生率，μ介子几乎瞬间从宇宙中消失。有趣的是，我们发现在$T_\mathrm{消失}$时，μ子数几乎等于重子丰度。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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The Muon Abundance in the Primordial Universe

Muon abundance is required for the understanding of several fundamental questions regarding properties of the primordial Universe. In this paper we evaluate the production and decay rates of muons in the cosmic plasma as a function of temperature. This allows us to determine when exactly the muon abundance disappears. When the Universe cools below the temperature $kT_\mathrm{disappear}\approx 4.135$ MeV the muon decay rate overwhelms production rates and muons vanish quasi-instantaneously from the Universe. Interestingly, we show that at $T_\mathrm{disappear}$ the muon number is nearly equal to baryon abundance.

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来源期刊

Acta Physica Polonica B 物理-物理：综合

CiteScore

1.70

自引率

20.00%

发文量

审稿时长

3-8 weeks

期刊介绍： Acta Physica Polonica B covers the following areas of physics: -General and Mathematical Physics- Particle Physics and Field Theory- Nuclear Physics- Theory of Relativity and Astrophysics- Statistical Physics