Dynamics of Electroweak Phase Transition In Singlet-Scalar Extension of the Standard Model
Dynamics of Electroweak Phase Transition In Singlet-Scalar Extension of the Standard Model
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DOI：
10.1103/physrevd.96.015036
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发表时间：
2017-04
影响因子：
5
通讯作者：
G. Kurup;M. Perelstein
中科院分区：
文献类型：
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作者：
G. Kurup;M. Perelstein
通过希格斯门户相互作用耦合真实规范单线标量场的标准模型，可以重新开启强一阶电弱相变（EWPT）和成功电弱重子生成（EWBG）的可能性。如果存在禁止双重态-单重态混合的离散对称性，则该模型很难在大型强子对撞机上进行测试。因此，它成为评估未来对撞机最终测试 EWPT 和 EWBG 能力的有用基准。在本文中，我们评估了该模型整个参数空间中的气泡成核温度，其中预计会发生一阶转变。我们发现，在这个参数空间的大部分区域，气泡实际上在任何有限温度下都不会成核，从而消除了这些模型作为可行的 EWBG 场景的可能性。该约束消除了天真地预测“两步”相变的大部分区域，而“一步”相变区域基本上不受影响。此外，在产生重子不对称性的转变过程中，膨胀的气泡壁不得达到相对论速度。我们证明，这种情况进一步减少了可行的 EWBG 的参数空间。
An addition to the Standard Model of a real, gauge-singlet scalar field, coupled via a Higgs portal interaction, can reopen the possibility of a strongly first-order electroweak phase transition (EWPT) and successful electroweak baryogenesis (EWBG). If a discrete symmetry that forbids doublet-singlet mixing is present, this model is notoriously difficult to test at the Large Hadron Collider. As a result, it emerged as a useful benchmark for evaluating the capabilities of proposed future colliders to conclusively test EWPT and EWBG. In this paper, we evaluate the bubble nucleation temperature throughout the parameter space of this model where a first-order transition is expected. We find that in large parts of this parameter space, bubbles in fact do not nucleate at any finite temperature, eliminating these models as viable EWBG scenarios. This constraint eliminates most of the region where a "two-step" phase transition is naively predicted, while the "one-step" transition region is largely unaffected. In addition, expanding bubble walls must not reach relativistic speeds during the transition for baryon asymmetry to be generated. We show that this condition further reduces the parameter space with viable EWBG.