Systematic analysis of baryogenesis in non-equilibrium quantum field theory

今天观测到的宇宙几乎完全由物质组成，也就是说，是重子不对称的。一个非常有吸引力的解释所观察到的不对称性提供了通过轻生重子的情况。根据这种假设，物质超过反物质的过剩是由重马约拉纳中微子衰变产生的。重中微子的存在同时也解释了常规中微子的质量虽小但不会消失。也就是说，中微子物理学和早期宇宙物理学之间存在着令人兴奋的联系。许多研究人员已经对纤体发育的许多重要方面进行了广泛的研究。最先进的计算使用玻尔兹曼方程与真空散射项来计算宇宙的重子不对称性。这种近似在炽热和快速膨胀的早期宇宙中的适用性是值得怀疑的。我们的专业知识使我们能够使用非平衡量子场论的方法来验证它。这些方法提供了一个机会来计算校正的结果的正则分析的基础上使用的玻尔兹曼方程。此外，它们使我们能够找到规范方法的适用范围，并发现一些定性的新效应。

Today the observed universe almost entirely consists of matter, i.e. is baryonically asymmetric. A very attractive explanation of the observed asymmetry is provided by the baryogenesis via leptogenesis scenario. According to this scenario the excess of matter over antimatter has been generated by the decay of heavy Majorana neutrinos. The existence of the heavy neutrinos simultaneously explains the small but non-vanishing masses of the conventional neutrinos. That is, there is an exciting connection between neutrino physics and the physics of the early Universe. Many important aspects of leptogenesis have been extensively studied by a number of researchers. The state of the art calculations use the Boltzmann equation with the vacuum scattering terms to compute the baryon asymmetry of the universe. The applicability of this approximation in the hot and rapidly expanding early universe is questionable. Our expertise allows us to verify it using methods of non-equilibrium quantum field theory. These methods offer an opportunity to calculate corrections to the results of the canonical analysis based on the use of the Boltzmann equation. Furthermore, they enable us to find the range of the applicability of the canonical approach and discover a number of qualitatively new effects.