中微子-4(Neutrino-4)实验结果、无菌中微子、暗物质和由右旋中微子扩展的标准模型

IF 0.6 4区 物理与天体物理 Q4 PHYSICS, PARTICLES & FIELDS Physics of Particles and Nuclei Pub Date : 2024-10-09 DOI:10.1134/S1063779624700989
A. P. Serebrov, R. M. Samoilov, O. M. Zherebtsov, N. S. Budanov
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摘要

对中微子-4实验结果以及GALLEX、SAGE和BEST实验数据的分析证实了中微子-4实验声称的中微子振荡参数(\(\Delta m_{{14}}^{2}\) = 7.3 eV2和sin22θ14 = 0.36),并将置信度提高到5.8σ。这种不育中微子在宇宙等离子体中热化,对宇宙能量密度的贡献为5%,可以解释15%-20%的暗物质。讨论认为,在中微子模型的基础上,根据有源中微子的种类数量再引入两个重的无源中微子,但混合角要非常小以避免热化,这样就有可能解释宇宙的大尺度结构,并使无源中微子对宇宙暗物质的贡献达到27%的水平。本文介绍了由三个右手中微子组成的暗物质的动态生成过程。结果表明,目前关于\(^{4}{text{He}}\)丰度的天体物理数据使得我们无法得出支持三个或四个热化中微子模型的明确结论。
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 Result of the Neutrino-4 Experiment, Sterile Neutrinos, Dark Matter, and the Standard Model Extended by Right-Handed Neutrinos

The analysis of results of the Neutrino-4 experiment and the data of the GALLEX, SAGE, and BEST experiments confirms the parameters of neutrino oscillations claimed by the Neutrino-4 experiment (\(\Delta m_{{14}}^{2}\) = 7.3 eV2 and sin214 = 0.36) and increases the confidence level up to 5.8σ. This sterile neutrino thermalizes in the cosmic plasma, contributes 5% to the energy density of the Universe, and can explain 15–20% of the dark matter. It is discussed that the extension of the neutrino model by introducing two more heavy sterile neutrinos in accordance with the number of types of active neutrinos, but with very small mixing angles to avoid the thermalization, makes it possible to explain the large-scale structure of the Universe and bring the contribution of sterile neutrinos to the Universe dark matter up to a level of 27%. The dynamic process of generation of the dark matter, consisting of three right-handed neutrinos, is presented. It is shown that the current astrophysical data on the \(^{4}{\text{He}}\) abundance make it impossible to draw a definite conclusion in favor of the model of three or four thermalized neutrinos.

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来源期刊
Physics of Particles and Nuclei
Physics of Particles and Nuclei 物理-物理:粒子与场物理
CiteScore
1.00
自引率
0.00%
发文量
116
审稿时长
6-12 weeks
期刊介绍: The journal Fizika Elementarnykh Chastits i Atomnogo Yadr of the Joint Institute for Nuclear Research (JINR, Dubna) was founded by Academician N.N. Bogolyubov in August 1969. The Editors-in-chief of the journal were Academician N.N. Bogolyubov (1970–1992) and Academician A.M. Baldin (1992–2001). Its English translation, Physics of Particles and Nuclei, appears simultaneously with the original Russian-language edition. Published by leading physicists from the JINR member states, as well as by scientists from other countries, review articles in this journal examine problems of elementary particle physics, nuclear physics, condensed matter physics, experimental data processing, accelerators and related instrumentation ecology and radiology.
期刊最新文献
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