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arXiv 1107.5441hep-phastro-ph.CO
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单重态标准模型中的强电弱相变

Strong Electroweak Phase Transitions in the Standard Model with a Singlet

Jose R. Espinosa, Thomas Konstandin, Francesco Riva

摘要:

众所周知,在具有一个实标量单态的标准模型的扩展中,对于希格斯粒子的实际质量值,电弱相变(EWPhT)可以是一阶的。我们重新审视这种情况下,最一般的重整化标量位系统地确定所有区域的参数空间中,开发,由于树级动力学,在临界温度的势垒是足够强大的,以避免sphaleron洗出的重子不对称性。这种强EWPhTs允许一个简单的平均场近似和自由能的分析处理,导致非常好的理论控制和理解的不同机制,可以使过渡强。基于在临界温度处的平坦方向发展,我们确定了这种机制的一种新的实现,该实现可以在其他模型中操作。最后,我们详细讨论了一些特殊情况下的模型进行数值计算的单圈自由能,提高了平均场近似,并确认了分析的期望。

英文摘要:

It is well known that the electroweak phase transition (EWPhT) in extensions of the Standard Model with one real scalar singlet can be first-order for realistic values of the Higgs mass. We revisit this scenario with the most general renormalizable scalar potential systematically identifying all regions in parameter space that develop, due to tree-level dynamics, a potential barrier at the critical temperature that is strong enough to avoid sphaleron wash-out of the baryon asymmetry. Such strong EWPhTs allow for a simple mean-field approximation and an analytic treatment of the free-energy that leads to very good theoretical control and understanding of the different mechanisms that can make the transition strong. We identify a new realization of such mechanism, based on a flat direction developing at the critical temperature, which could operate in other models. Finally, we discuss in detail some special cases of the model performing a numerical calculation of the one-loop free-energy that improves over the mean-field approximation and confirms the analytical expectations.

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