原初大N重子形成中的卡西米尔瓶颈
A Casimir bottleneck in primordial large-N baryon formation
- SISSA, International School for Advanced Studies(国际高等研究院)
- Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati(意大利国家核物理研究所,弗拉斯卡蒂国家实验室)
- Laboratory of High Energy and Computational Physics, NICPB(NICPB高能计算物理实验室)
机构由 AI 辅助整理,请以论文原文为准。
AI总结:
研究早期宇宙大N规范理论中重子形成,发现卡西米尔标度导致形成瓶颈,影响遗迹密度估计。
AI中文摘要:
我们研究早期宇宙中,在具有基本表示夸克的禁闭SU(N)规范理论中的重子(B)形成。禁闭势的卡西米尔标度意味着,在大N下,B的形成受到瓶颈的阻碍:对于代表B组装初始阶段的小夸克团簇,破坏过程远大于形成过程。在B-Bbar对称等离子体中,宇宙学稳定的B的遗迹密度,在大N下,由禁闭期间决定,而非由湮灭冻结决定。这影响SU(N)暗物质模型的遗迹密度估计。
英文摘要:
We study baryon $(\mathcal{B})$ formation in the early Universe in a confining $SU(\mathcal{N})$ gauge theory with quarks transforming in the fundamental representation. Casimir scaling of the confining potential implies that, at large $\mathcal{N}$, $\mathcal{B}$ formation is hindered by a bottleneck: for small quark clusters, representing the initial stages of $\mathcal{B}$ assembly, destruction processes greatly outweigh formation processes. In a $\mathcal{B}$-$\bar{\mathcal{B}}$ symmetric plasma, the relic density of cosmologically stable $\mathcal{B}$'s is set, for large $\mathcal{N}$, during confinement rather than by annihilation freeze-out. This affects relic-density estimates for $SU(\mathcal{N})$ dark matter models.