A Confining Strong First-Order Electroweak Phase Transition
A Confining Strong First-Order Electroweak Phase Transition
复制标题
强约束一阶电弱相变
DOI：
10.1088/1126-6708/2007/09/077
复制
发表时间：
2007
影响因子：
5.4
通讯作者：
A. Wulzer
中科院分区：
文献类型：
--
作者：
G. Nardini;M. Quirós;A. Wulzer
在Randall-Sundrum模型中，辐射由Goldberger-Wise （GW）势稳定，在低于典型标准模型临界温度数量级的温度下，从限定相到受限相发生过冷转变。当希格斯粒子被定位在红外膜上时，电弱相变被延迟，并成为一个强的一阶相变，宇宙膨胀了几个电子倍。这就产生了在电弱相变中存在电弱重子发生所需要的非平衡条件的可能性。数值研究了GW参数空间中理论一致的区域，实现了后一种可能性。我们发现，在大多数参数空间中，由于成核温度很低，球状体在气泡内完全不活动。再加热后闪子不活动的条件对重希格斯玻色子的再加热温度施加了一个上限，这个上限对重希格斯玻色子来说较弱，因此非平衡条件似乎更有利于重希格斯玻色子。球状体在气泡外活跃的条件为相变时的e折叠数量设定了上限，这与解决宇宙学视界问题所需的低尺度暴胀的临界值大致一致。
In the Randall-Sundrum model where the radion is stabilized by a Goldberger-Wise (GW) potential there is a supercooled transition from a deconfined to a confined phase at temperatures orders of magnitude below the typical Standard Model critical temperature. When the Higgs is localized at the IR brane the electroweak phase transition is delayed and becomes a strong first-order one where the Universe expands by a few e-folds. This generates the possibility of having the out-of-equilibrium condition required by electroweak baryogenesis in the electroweak phase transition. We have studied numerically the region of the GW parameter space where the theory is consistent and the latter possibility is realized. We have found that in most of the parameter space the nucleation temperature is so low that sphalerons are totally inactive inside the bubbles. The condition for sphalerons to be inactive after reheating imposes an upper bound on the reheating temperature that is weaker for heavy Higgs bosons so that the out-of-equilibrium condition seems to favor heavy over light Higgses. The condition for sphalerons to be active outside the bubbles puts an upper bound on the number of e-folds at the phase transition, roughly consistent with the critical value required by low-scale inflation to solve the cosmological horizon problem.