Multistep strongly first order phase transitions from new fermions at the TeV scale
Multistep strongly first order phase transitions from new fermions at the TeV scale
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DOI：
10.1103/physrevd.99.055023
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发表时间：
2018-12
影响因子：
5
通讯作者：
A. Angelescu;Peisi Huang
中科院分区：
文献类型：
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作者：
A. Angelescu;Peisi Huang
一阶电弱相变（EWPTs）可以为宇宙中重子不对称性的产生提供必要的条件，尽管有大量关于这一主题的文献，但费米子诱导的EWPTs仍然是一个相当未知的领域。在本文中，我们考虑了标准模型的一个简单费米子扩展，涉及一个$SU(2)_L$双重态和两个$SU(2)_L$单重态类矢量轻子，它们与希格斯玻色子强耦合，质量接近TeV尺度。我们展示了这样一个简单的场景如何产生一个非平凡的宇宙热历史，包括在接近电弱尺度的温度下发生的强烈的一阶多步相变。最后，我们在未来基于空间的引力波探测器（如LISA， DECIGO和BBO）上研究了这些相变的不同引力波（GW）特征，并简要讨论了类矢量轻子的可能LHC特征。
In spite of the vast literature on the subject of first order Electroweak Phase Transitions (EWPTs), which can provide the necessary conditions for generating the Baryon Asymmetry in the Universe, fermion-induced EWPTs still remain a rather uncharted territory. In this paper, we consider a simple fermionic extension of the Standard Model involving one $SU(2)_L$ doublet and two $SU(2)_L$ singlet Vector-Like Leptons, strongly coupled to the Higgs boson and with masses close to the TeV scale. We show how such a simple scenario can give rise to a non-trivial thermal history of the Universe, involving strongly first order multistep phase transitions occurring at temperatures close to the electroweak scale. Finally, we investigate the distinct Gravitational Wave (GW) signatures of these phase transitions at future space--based GW detectors, such as LISA, DECIGO, and BBO, and briefly discuss the possible LHC signatures of the Vector-Like Leptons.