Leptogenesis in theories with large extra dimensions
Leptogenesis in theories with large extra dimensions
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具有大额外维度的轻子发生理论
DOI：
10.1103/physrevd.60.105023
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发表时间：
1999
影响因子：
5
通讯作者：
A. Pilaftsis
中科院分区：
文献类型：
--
作者：
A. Pilaftsis
在高维理论中，量子引力的尺度比通常的普朗克质量小许多个数量级，我们研究了通过细微发生来实现重子发生的情景。这些理论的最小实现包括感觉到存在大的紧致维度的等小微子中微子，而所有的SM粒子都局域在$(1+3)$维子空间上。在最小瘦子发生模型的公式中，我们特别注意高维Majorana旋量的存在。在压缩额外维度后，我们得到了一个Majorana Kaluza-Klein激发塔，它相当于无限系列的破坏CP的谐振子，并导出了它们相长干涉的必要条件。基于这一破坏CP的机制，我们发现，重Majorana激发的衰变可以产生轻子不对称，并且在再热温度高于5GeV的情况下，通过不平衡的激元相互作用，可以再处理成观测到的宇宙重子不对称。
We study the scenario of baryogenesis through leptogenesis in higher-dimensional theories, in which the scale of quantum gravity is many orders of magnitude smaller than the usual Planck mass. The minimal realization of these theories includes an isosinglet neutrino which feels the presence of large compact dimensions, whereas all the SM particles are localized on a $(1+3)$-dimensional subspace. In the formulation of minimal leptogenesis models, we pay particular attention to the existence of Majorana spinors in higher dimensions. After compactification of the extra dimensions, we obtain a tower of Majorana Kaluza-Klein excitations which act as an infinite series of CP-violating resonators, and derive the necessary conditions for their constructive interference. Based on this CP-violating mechanism, we find that the decays of the heavy Majorana excitations can produce a leptonic asymmetry which is reprocessed into the observed baryonic asymmetry of the Universe by means of out-of-equilibrium sphaleron interactions, provided the reheat temperature is above 5 GeV.