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早期宇宙的超电荷破裂和中微子质量生成

S López-Zurdo¹, A Lozano-Onrubia¹, L Merlo¹

¹Universidad Autónoma de Madrid, Instituto de Física Teórica UAM/CSIC, Departamento de Física Teórica and , Cantoblanco, 28049, Madrid, Spain.

Physical review letters

|February 14, 2025

概括

早期宇宙的超电荷对称性在标准模型扩展中被打破,为解释物质-反物质不对称性提供了新的方法. 这项研究探讨了Zee-Babu模型中的一种新的LeptoGenesis机制,利用破电荷的Lepton质量.

科学领域:

粒子物理学粒子物理学
宇宙学的宇宙学是什么?
高能物理高能物理

背景情况:

标准模型 (SM) 描述了基本粒子和力,但不能完全解释中微子质量或宇宙的物质-反物质不对称性.
建议扩展SM以解决这些缺陷,通常涉及新的对称性和粒子.
辐射中微子质量生成模型提供了一种通过循环相互作用产生小中微子质量的机制.

研究的目的:

为了研究早期宇宙中自发的U(1)_Y超电荷测量仪对称性破裂的含义.
探索这种对称性破坏如何在SM的扩展范围内促进微生物生成,并解释物质-反物质不对称性.
为了分析Zee-Babu辐射中微子质量模型的潜在电荷破裂场景,有利于早期宇宙的代.

主要方法:

标准模型扩展的理论分析,包括辐射中微子质量生成.
专注于在高温下自发地破坏U(1)_Y超电荷对称性的场景.
对Zee-Babu模型的检查,以确定电荷破裂的子质量在电弱对称性破裂之前的条件.

主要成果:

自发的U(1)_Y超电荷对称性破坏的条件通常存在于辐射生成轻中子子质量的SM扩展中.
早期宇宙的超电荷破裂为解释观察到的物质-反物质不对称性开辟了新的途径.
在Zee-Babu模型中,超电荷破裂的时期可以通过一种涉及电荷破裂的子质的新型子生成机制,实现成功的子生成.

结论:

在早期宇宙中,自发的超电荷对称性破裂在某些标准模型扩展中是一个可行的场景.
这种对称性破坏为非传统的瘦子发生提供了一个令人信服的框架,可能解释物质-反物质不对称性.
齐巴布模型作为一个具体的例子,可以满足这些条件,将中微子物理学与宇宙学联系起来.

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