Searches for other vacua. Part II. A new Higgstory at the cosmological collider
Searches for other vacua. Part II. A new Higgstory at the cosmological collider
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DOI：
10.1007/jhep01(2020)105
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发表时间：
2019-07
影响因子：
5.4
通讯作者：
A. Hook;Junwu Huang;Davide Racco
中科院分区：
文献类型：
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作者：
A. Hook;Junwu Huang;Davide Racco
在密度扰动的双谱中检测到振荡模式可能表明希格斯势中存在高能第二极小值。如果希格斯场在暴胀过程中处于这个新的最小值，并在再加热过程中通过热修正回到电弱真空，那么标准模型粒子与暴胀子的耦合将在双谱上留下印记。我们专注于费米子，其色散关系可以通过与暴胀子的耦合来修改，从而导致在暴胀过程中增强的粒子产生，即使它们在暴胀过程中的质量大于哈勃尺度。这导致了一个大的非解析贡献的非高斯性，与振幅f NL高达100的压缩极限，在未来的21厘米的调查可能检测到。测量两个费米子的贡献将使我们能够计算它们的质量比，并将信号的起源归因于新的希格斯最小值。这样的发现将是理解希格斯势真空不稳定性的巨大一步，并可能对人类的考虑产生迷人的影响。
The detection of an oscillating pattern in the bispectrum of density perturbations could suggest the existence of a high-energy second minimum in the Higgs potential. If the Higgs field resided in this new minimum during inflation and was brought back to the electroweak vacuum by thermal corrections during reheating, the coupling of Standard Model particles to the inflaton would leave its imprint on the bispectrum. We focus on the fermions, whose dispersion relation can be modified by the coupling to the inflaton, leading to an enhanced particle production during inflation even if their mass during inflation is larger than the Hubble scale. This results in a large non-analytic contribution to non-Gaussianities, with an amplitude f NL as large as 100 in the squeezed limit, potentially detectable in future 21-cm surveys. Measuring the contributions from two fermions would allow us to compute the ratio of their masses, and to ascribe the origin of the signal to a new Higgs minimum. Such a discovery would be a tremendous step towards understanding the vacuum instability of the Higgs potential, and could have fascinating implications for anthropic considerations.