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arXiv 1211.2140hep-ph
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热瘦成作用的系统方法

Systematic approach to thermal leptogenesis

T. Frossard, M. Garny, A. Hohenegger, A. Kartavtsev, D. Mitrouskas

摘要:

在这项工作中,我们研究热leptogenesis使用非平衡量子场论。从基本方程的量子场,我们描述了必要的步骤,以获得准粒子的量子动力学方程。这些可以很容易地与传统的结果相比,并克服固有的规范方法的概念问题。除了CP破坏衰变,我们还包括那些散射过程,这是密切相关的衰变在一个一致的近似的四阶汤川耦合。它明确地证明了如何在传统的方法中的散射过程的S-矩阵元素有关的两个和三个回路的贡献的有效行动。我们推导出有效的衰减和散射振幅考虑介质修正和热质量。在这种情况下,我们还在相同的形式下研究了违反CP的希格斯衰变。从动力学方程,我们得到轻子不对称性的速率方程改进,因为它们包括量子统计效应和介质修正准粒子的属性。

英文摘要:

In this work we study thermal leptogenesis using non-equilibrium quantum field theory. Starting from fundamental equations for correlators of the quantum fields we describe the steps necessary to obtain quantum kinetic equations for quasiparticles. These can easily be compared to conventional results and overcome conceptional problems inherent in the canonical approach. Beyond CP-violating decays we include also those scattering processes which are tightly related to the decays in a consistent approximation of fourth order in the Yukawa couplings. It is demonstrated explicitly how the S-matrix elements for the scattering processes in the conventional approach are related to two- and three-loop contributions to the effective action. We derive effective decay and scattering amplitudes taking medium corrections and thermal masses into account. In this context we also investigate CP-violating Higgs decay within the same formalism. From the kinetic equations we derive rate equations for the lepton asymmetry improved in that they include quantum-statistical effects and medium corrections to the quasiparticle properties.

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