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arXiv 1712.03312hep-phgr-qchep-th
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CPT中重右手中微子违反本底的轻子生成

Leptogenesis from Heavy Right-Handed Neutrinos in CPT Violating Backgrounds

Thomas Bossingham, Nick E. Mavromatos, Sarben Sarkar

摘要:

我们讨论了一个模型中的leptogenesis与重右手Majorana中微子传播在一个恒定的,但在其他方面通用的CPT违反轴向类时背景(这可能是出于弦论的考虑)。在远高于电弱相变温度的温度下,我们解析地但近似地(使用Pade近似)求解了相应的玻尔兹曼方程,该方程描述了由于重中微子衰变为标准模型轻子而产生的轻子不对称性。这些轻子在这样的温度下实际上是无质量的。目前的工作完成了一个严格的方式初步处理相同的系统,由一些本作者。在早期的工作中,轻子的不对称性是通过考虑静止的右手中微子的衰变而粗略估计的。我们目前的分析包括重中微子的热动量模式,这导致了总轻子不对称性,与以前的估计相比,它大了两倍。尽管如此,我们目前和初步的冻出结果是一致的(在12.5%的不确定性内)。我们的分析依赖于一种新的使用帕德近似来解决玻尔兹曼方程,并可能在宇宙学中更广泛地使用。

英文摘要:

We discuss leptogenesis in a model with heavy right-handed Majorana neutrinos propagating in a constant but otherwise generic CPT-violating axial time-like background (which could be motivated by string theory considerations). At temperatures much higher than the temperature of the electroweak phase transition we solve analytically but approximately (using Pade approximants) the corresponding Boltzmann equations, which describe lepton asymmetry generation due to the tree-level decays of the heavy neutrinos into standard model leptons. These leptons are effectively massless at such temperatures. The current work completes in a rigorous way a preliminary treatment of the same system, by some of the present authors. In this earlier work, lepton asymmetry was crudely estimated considering the decay of a right-handed neutrino at rest. Our present analysis includes thermal momentum modes for the heavy neutrino and this leads to a total lepton asymmetry which is bigger by a factor of two as compared to the previous estimate. Nevertheless, our current and preliminary results for the freezeout are found to be in agreement (within a 12.5% uncertainty). Our analysis depends on a novel use of Pade approximants to solve the Boltzmann equations and may be more widely useful in cosmology.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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