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arXiv 2202.04221hep-phastro-ph.CO
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多临界点原理模型中的引力波

Gravitational waves in models with multicritical-point principle

Yuta Hamada, Hikaru Kawai, Kiyoharu Kawana, Kin-ya Oda, Kei Yagyu

摘要:

多临界点原理(MPP)为普朗克尺度和电弱尺度之间的大层次提供了一个自然的解释。我们考虑这样一种情形,其中MPP被应用于由两个实单重标量场$ϕ$和$S$扩展的标准模型,并且通过$ϕ$的真空期望值发生维度嬗变。在本文中,我们专注于具有$\mathbb Z_2$对称性$S\rightarrow -S$和所有其他领域的左不变的临界点。然后,$S$成为一个自然的暗物质(DM)候选者。此外,我们集中在$ϕ$不具有进一步的$\mathbb Z_2$对称性,使没有宇宙学畴壁问题的临界点。在这样的临界点,我们专注于最大的临界点称为CP-1234,固定所有superrenormalizable参数。我们发现,仍然有一个参数区域,满足DM遗迹丰度,DM直接检测界和当前LHC的限制。在这个区域,我们发现一个一级相变在早期宇宙的TeV尺度的温度。由此产生的引力波的预测峰值振幅为${\cal O}(10^{-12})$,频率为$10^{-2}$ - $10^{-1}$ Hz,可以用未来的空间仪器,如DECIGO和BBO进行测试。

英文摘要:

The multicritical-point principle (MPP) provides a natural explanation of the large hierarchy between the Planck and electroweak scales. We consider a scenario in which MPP is applied to the Standard Model extended by two real singlet scalar fields $ϕ$ and $S$, and a dimensional transmutation occurs by the vacuum expectation value of $ϕ$. In this paper, we focus on the critical points that possess a $\mathbb Z_2$ symmetry $S\rightarrow -S$ and all the other fields are left invariant. Then $S$ becomes a natural dark matter (DM) candidate. Further, we concentrate on the critical points where $ϕ$ does not possess further $\mathbb Z_2$ symmetry so that there is no cosmological domain-wall problem. Among such critical points, we focus on maximally critical one called CP-1234 that fix all the superrenormalizable parameters. We show that there remains a parameter region that satisfies the DM relic abundance, DM direct-detection bound and the current LHC constraints. In this region, we find a first-order phase transition in the early universe around the TeV-scale temperature. The resultant gravitational waves are predicted with a peak amplitude of ${\cal O}(10^{-12})$ at a frequency of $10^{-2}$-$10^{-1}$ Hz, which can be tested with future space-based instruments such as DECIGO and BBO.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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