Leptogenesis as the origin of matter
Leptogenesis as the origin of matter
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DOI：
10.1146/annurev.nucl.55.090704.151558
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发表时间：
2005-02
影响因子：
12.4
通讯作者：
W. Buchmuller;R. Peccei;T. Yanagida
中科院分区：
文献类型：
--
作者：
W. Buchmuller;R. Peccei;T. Yanagida
我们详细地探讨了这样一个假设，即在宇宙历史的早期，原始轻子-反轻子不对称性（轻子生成）的产生是物质起源的根本原因。在解释了在宇宙中产生物质-反物质不对称性的理论条件之后，我们详细介绍了如何通过sphaleron过程，将轻子不对称性--或者更准确地说，（B - L）--转化为重子不对称性。由于Leptogenesis详细取决于中微子光谱的性质，我们简要回顾现有的实验信息中微子以及跷跷板机制，这提供了一个理论上的理解，为什么中微子是如此轻。大部分的审查是专门讨论的热Leptogenesis，我们表明，中微子光谱振荡实验建议，一个得到的重子光子密度比在宇宙中的观测值，独立于任何初始边界条件。在...
▪ Abstract We explore in some detail the hypothesis that the generation of a primordial lepton-antilepton asymmetry (Leptogenesis) early on in the history of the Universe is the root cause for the origin of matter. After explaining the theoretical conditions for producing a matter-antimatter asymmetry in the Universe we detail how, through sphaleron processes, it is possible to transmute a lepton asymmetry—or, more precisely, a (B – L)-asymmetry—into a baryon asymmetry. Because Leptogenesis depends in detail on properties of the neutrino spectrum, we review briefly existing experimental information on neutrinos as well as the seesaw mechanism, which offers a theoretical understanding of why neutrinos are so light. The bulk of the review is devoted to a discussion of thermal Leptogenesis, and we show that for the neutrino spectrum suggested by oscillation experiments, one obtains the observed value for the baryon to photon density ratio in the Universe, independently of any initial boundary conditions. In ...