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arXiv 1604.04526hep-ph
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由Yukawas变化引起的一级电弱相变

A First-Order Electroweak Phase Transition from Varying Yukawas

Iason Baldes, Thomas Konstandin, Geraldine Servant

摘要:

我们表明,负责的标准模型费米子的汤川耦合的变化的动力学一般导致一个非常强的一阶电弱相变,假设汤川耦合是大的和顺序1之前的电弱相变,并达到他们现在的值之后。有很好的动机考虑味结构可能出现在电弱对称性破缺期间,例如,如果Froggatt-Nielsen场动力学与希格斯场有关。在本文中,我们不需要假设任何特定的理论的味道,并显示在一个模型无关的方式如何电弱相变的性质是完全改变时,标准模型Yukawas变化的同时,希格斯是获得其真空期望值。费米子的热贡献在有效势的对称和破缺相位最小值之间产生势垒,导致一阶相变。这为在电弱尺度上产生重子不对称性提供了新的途径,与味模型密切相关。

英文摘要:

We show that the dynamics responsible for the variation of the Yukawa couplings of the Standard Model fermions generically leads to a very strong first-order electroweak phase transition, assuming that the Yukawa couplings are large and of order 1 before the electroweak phase transition and reach their present value afterwards. There are good motivations to consider that the flavour structure could emerge during electroweak symmetry breaking, for example if the Froggatt-Nielsen field dynamics were linked to the Higgs field. In this paper, we do not need to assume any particular theory of flavour and show in a model-independent way how the nature of the electroweak phase transition is completely changed when the Standard Model Yukawas vary at the same time as the Higgs is acquiring its vacuum expectation value. The thermal contribution of the fermions creates a barrier between the symmetric and broken phase minima of the effective potential, leading to a first-order phase transition. This offers new routes for generating the baryon asymmetry at the electroweak scale, strongly tied to flavour models.

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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