Mirror twin Higgs cosmology: constraints and a possible resolution to the H0 and S8 tensions
Mirror twin Higgs cosmology: constraints and a possible resolution to the H0 and S8 tensions
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DOI：
10.1007/jhep05(2022)050
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发表时间：
2021-10
影响因子：
5.4
通讯作者：
Saurabh Bansal;Jeong Han Kim;C. Kolda;M. Low;Yuhsin Tsai
中科院分区：
文献类型：
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作者：
Saurabh Bansal;Jeong Han Kim;C. Kolda;M. Low;Yuhsin Tsai
镜像孪生希格斯模型（英语：Mirror twin Higgs model，简称MTH）是解决希格斯层次问题的一个方案，它提供了预测良好的宇宙学特征，只有三个额外的参数：孪生扇区的温度、孪生重子的丰度和孪生电弱对称性破缺的真空期望值（VEV）。这些参数描述了孪生重子辐射和声学振荡的行为，从而对宇宙微波背景（CMB）和大尺度结构（LSS）产生可检验的影响。虽然对撞机搜索只能探测双VEV，通过适合宇宙学数据，我们表明，现有的CMB（普朗克18 TTTEEE+ lowE+ lowT+透镜）和LSS（KV 450）的数据已经提供了有用的约束剩余的MTH参数。此外，我们还证明了在这个模型中，孪生辐射的存在可以提高哈勃常数H0，而散射的孪生重子可以降低物质涨落S8，这有助于同时弛豫观测到的H0和S8张力.这种情况与典型的ΛCDM+ Λ N eff模型不同，在该模型中，额外的辐射有助于哈勃张力，但会破坏S8张力。例如，当在拟合中包括SH0ES和2013年普朗克SZ的数据时，我们发现一个由双子重子组成的暗物质占宇宙总质量的20%的宇宙比ΛCDM更优先。如果双子区确实负责解决H 0和S 8张力，那么未来来自欧几里得卫星和CMB第4阶段实验的测量将进一步测量双子参数到O（1− 10%）水平的精度。我们的研究展示了如何使用精确的宇宙学数据来探索具有隐藏自然性的模型。
The mirror twin Higgs model (MTH) is a solution to the Higgs hierarchy problem that provides well-predicted cosmological signatures with only three extra parameters: the temperature of the twin sector, the abundance of twin baryons, and the vacuum expectation value (VEV) of twin electroweak symmetry breaking. These parameters specify the behavior of twin radiation and the acoustic oscillations of twin baryons, which lead to testable effects on the cosmic microwave background (CMB) and large-scale structure (LSS). While collider searches can only probe the twin VEV, through a fit to cosmological data we show that the existing CMB (Planck18 TTTEEE+ lowE+ lowT+ lensing) and LSS (KV450) data already provide useful constraints on the remaining MTH parameters. Additionally, we show that the presence of twin radiation in this model can raise the Hubble constant H 0 while the scattering twin baryons can reduce the matter fluctuations S 8, which helps to relax the observed H 0 and S 8 tensions simultaneously. This scenario is different from the typical ΛCDM+∆ N eff model, in which extra radiation helps with the Hubble tension but worsens the S 8 tension. For instance, when including the SH0ES and 2013 Planck SZ data in the fit, we find that a universe with≳ 20% of the dark matter comprised of twin baryons is preferred over ΛCDM by∼ 4σ. If the twin sector is indeed responsible for resolving the H 0 and S 8 tensions, future measurements from the Euclid satellite and CMB Stage 4 experiment will further measure the twin parameters to O (1− 10%)-level precision. Our study demonstrates how models with hidden naturalness can potentially be probed using precision cosmological data.