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arXiv 1807.08770hep-ph
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高尺度电弱相变:重子生成与对称性不可恢复

High Scale Electroweak Phase Transition: Baryogenesis & Symmetry Non-Restoration

Iason Baldes, Geraldine Servant

摘要:

我们探讨了电弱相变发生在比今天的电弱尺度高得多的尺度上的可能性。在这方面,高尺度CP破坏源的电弱重子不受低能实验。我们提出了一个方案,高规模的电弱重子发生与风味物理。这种情况下,允许一段时间的增强汤川耦合在宇宙的演化过程中,源依赖于时间的CP破坏。在高尺度相变之后,由于大量额外的电弱尺度中性标量耦合到希格斯粒子,对希格斯粒子热质量平方的负贡献,电弱对称性永远不会恢复。结果,避免了重子不对称性的冲刷。

英文摘要:

We explore the possibility that the electroweak phase transition happens at a scale much higher than the electroweak scale today. In this context, high scale CP-violating sources for electroweak baryogenesis are not constrained by low-energy experiments. We propose a scenario of high-scale electroweak baryogenesis linked to flavour physics. This scenario allows for a period of enhanced Yukawa couplings during the evolution of the universe, which source time-dependent CP violation. The electroweak symmetry is never restored after the high-scale phase transition due to negative contributions to the Higgs thermal mass squared from a large number of additional electroweak-scale neutral scalars coupling to the Higgs. As a result, the washout of the baryon asymmetry is avoided.

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