Freeze-out of baryon number in low-scale leptogenesis
Freeze-out of baryon number in low-scale leptogenesis
复制标题
低尺度轻子发生过程中重子数的冻结
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
I. Timiryasov
中科院分区：
文献类型：
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作者：
S. Eijima;M. Shaposhnikov;I. Timiryasov
低尺度的稀薄起源提供了一个经济的和可检验的描述宇宙的重子不对称性的起源。在这种情况下，宇宙的重子不对称性是从轻子不对称性通过电弱sphaleron过程重新处理的。如果斯帕拉子的速度足够快，可以维持平衡，重子和轻子的不对称性值是相互关联的。通常，这个关系式被用来求出在裂子冻结时重子不对称性的值。换句话说，这个公式只在斯法隆快的时候才有效，而在它们实际上被关闭的时候才适用。在本文中，我们将研究这种治疗的有效性。为此，我们解决了低规模leptogenesis动力学方程的完整系统。这个系统包括描述右手中微子振荡中轻子不对称性产生的方程，以及重子不对称性的单独动力学方程。我们表明，对于某些值的模型参数，标准方法的校正是相当大的。我们还提出了一个可行的改进，普通程序，占这些更正。
Low-scale leptogenesis provides an economic and testable description of the origin of the baryon asymmetry of the Universe. In this scenario, the baryon asymmetry of the Universe is reprocessed from the lepton asymmetry by electroweak sphaleron processes. Provided that sphalerons are fast enough to maintain equilibrium, the values of the baryon and lepton asymmetries are related to each other. Usually, this relation is used to find the value of the baryon asymmetry at the time of the sphaleron freeze-out. To put in other words, the formula which is valid only when the sphalerons are fast, is applied at the moment when they are actually switched off. In this paper, we examine the validity of such a treatment. To this end, we solve the full system of kinetic equations for low-scale leptogenesis. This system includes equations describing the production of the lepton asymmetry in oscillations of right-handed neutrinos, as well as a separate kinetic equation for the baryon asymmetry. We show that for some values of the model parameters, the corrections to the standard approach are sizeable. We also present a feasible improvement to the ordinary procedure, which accounts for these corrections.
影响因子：
5.4
作者：
M. Drewes;B. Garbrecht;Dario Gueter;J. Klaric
通讯作者：
M. Drewes;B. Garbrecht;Dario Gueter;J. Klaric