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arXiv 0903.4099hep-phastro-ph.CO
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电弱气泡壁会逃逸吗?

Can electroweak bubble walls run away?

Dietrich Bodeker, Guy D. Moore

摘要:

在SU(2)单重标量场的标准模型的扩展中,可能存在参数空间的区域,对于这些区域,电弱相变在分析的平均场水平上已经是一阶的。我们发现在这种情况下,相界面(气泡壁)可以成为超相对论性的,相对论性伽马因子γ =(1- v_{wall} ^2)^{-1/2}随壁的传播距离线性增长。我们提供了一个简单的标准,以确定是否气泡壁“跑掉”,以这种方式,或者如果伽玛接近一个终端值。

英文摘要:

In extensions of the Standard Model with SU(2) singlet scalar fields, there can be regions of parameter space for which the electroweak phase transition is first order already at the mean-field level of analysis. We show that in this case the phase interface (bubble wall) can become ultra-relativistic, with the relativistic gamma factor gamma = (1-v_{wall}^2)^{-1/2} growing linearly with the wall's propagation distance. We provide a simple criterion for determining whether the bubble wall "runs away" in this way or if gamma approaches a terminal value.

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