重子暗物质的种子
Seeding baryonic dark matter
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中文总结 AI 辅助
本文提出一种基于Peccei-Quinn畴壁的机制,论证原初夸克团(PQPs)可作为标准模型框架下观测可行的暗物质候选体。
中文摘要 AI 辅助
已有研究提出,原初夸克团(或称PQPs,即超高密度夸克物质迷你恒星)在温度约为1 GeV时形成,可能是解释宇宙暗物质的良好候选体。若该假设成立,暗物质将由非常致密的天体组成,其最大质量为10⁻² M⊙,半径约100米,不过更小的天体数量会多得多,且包含暗物质的大部分含量。本文描述了一种可行的形成机制:早期形成的超视界Peccei-Quinn畴壁在进入视界前扫过并积累夸克与胶子时,会增强局域重子密度,基于此机制,我们推导了原初夸克团的质量谱、最小质量及宇宙学丰度。假设收缩的Peccei-Quinn畴壁能高效浓缩重子,结果证实PQPs有望构成一种保守、基于标准模型且观测上可行的暗物质谜题解决方案。
英文摘要
It has been proposed that primordial quark pellets or PQPs --ultra-dense quark-matter mini- stars-- formed at $T\sim 1$ GeV may be a good candidate accounting for the dark matter of the universe. If correct, dark matter would consist of very compact objects with a maximum mass of $10^{-2} \ M_\odot$ and radii of approximately 100 m, although smaller objects would be much more abundant and encompass the bulk of the dark matter content. Here we describe a viable formation mechanism based on the enhancement of the local baryon density when supra-horizon Peccei-Quinn domain walls formed at an earlier epoch sweep and accumulate quarks and gluons before entering the horizon. Assuming an efficient baryon concentration by contracting Peccei-Quinn domain walls, we derive the resulting primordial quark pellet mass spectrum, minimum mass and cosmological abundance.
发表机构
- Universitat de Barcelona(巴塞罗那大学)
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