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arXiv 1005.5385hep-ph
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梯度展开对稀薄成因的量子修正

Quantum corrections to leptogenesis from the gradient expansion

M. Garny, A. Hohenegger, A. Kartavtsev

摘要:

使用封闭的时间路径形式主义,我们量化梯度校正的动力学方程leptogenesis,被忽略的标准玻尔兹曼方法。特别是,我们发现,一个额外的CP违反源项出现,这是非零的,即使当所有物种都在当地的热平衡。在早期宇宙中,它与膨胀率成正比,并且在符合萨哈罗夫条件的静力平衡组态中为零。我们发现,在一个标准的宇宙学背景下的热leptogenesis的附加源项是小的。但在超强冲刷极限下,它可以成为主导源。

英文摘要:

Using the closed-time-path formalism we quantify gradient corrections to the kinetic equations for leptogenesis, that are neglected in the standard Boltzmann approach. In particular we show that an additional CP-violating source term arises, which is non-zero even when all species are in local thermal equilibrium. In the early universe it is proportional to the expansion rate and would vanish for static equilibrium configurations, in accordance with the Sakharov conditions. We find that for thermal leptogenesis in a standard cosmological background the additional source term is small. However, it can become the dominant source in the limit of ultra-strong washout.

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