Systematic approach to thermal leptogenesis
Systematic approach to thermal leptogenesis
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DOI：
10.1103/physrevd.87.085009
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发表时间：
2012-11
影响因子：
5
通讯作者：
T. Frossard;M. Garny;A. Hohenegger;A. Kartavtsev;D. Mitrouskas
中科院分区：
文献类型：
--
作者：
T. Frossard;M. Garny;A. Hohenegger;A. Kartavtsev;D. Mitrouskas
本文利用非平衡量子场论研究了热致瘦现象。从量子场相关子的基本方程出发，描述了获得准粒子的量子动力学方程所必需的步骤。这些可以很容易地与常规结果进行比较，并克服规范方法固有的概念问题。除了违反cp的衰变外，我们还包括那些在汤川耦合中以一致的四阶近似与衰变密切相关的散射过程。明确地证明了传统方法中散射过程的s矩阵元素如何与有效作用的两环和三环贡献相关。考虑介质修正和热质量，我们推导出有效衰减和散射振幅。在这种情况下，我们也在相同的形式体系中研究了违反cp的希格斯衰变。从动力学方程推导出轻子不对称的速率方程，改进后的速率方程包含了准粒子性质的量子统计效应和介质修正。DOI: 10.1103 / PhysRevD.87.085009
In this work we study thermal leptogenesis using nonequilibrium 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. DOI: 10.1103/PhysRevD.87.085009