Cosmological implications of Standard Model criticality and Higgs inflation
Cosmological implications of Standard Model criticality and Higgs inflation
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DOI：
10.1016/j.nuclphysb.2020.114946
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发表时间：
2017-09
期刊：
影响因子：
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通讯作者：
Yuta Hamada;H. Kawai;Y. Nakanishi;Kin-ya Oda
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文献类型：
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作者：
Yuta Hamada;H. Kawai;Y. Nakanishi;Kin-ya Oda
观测到的希格斯质量表明，标准模型在普朗克尺度 M P 附近都是有效的。在这个框架内，重要的是要检查需要进行多少修改才能适应粒子物理学和宇宙学的最新实验结果。作为最小的扩展，我们考虑希格斯场扮演暴胀子角色并且暗物质是希格斯门标量场的可能性。我们假设扩展的标准模型在弦尺度 10 17 GeV 范围内都是有效的。（这意味着所有非最小耦合都不是特别大， xi≲ 10 2 ，就像在临界希格斯膨胀中一样，因为 M P/10 2∼ 10 17 GeV。）我们发现了张量与标量比 r 和暗物质质量 m DM 的相关理论界限。因此，普朗克束缚 r< 0.09 意味着暗物质质量必须小于 1.1 TeV，而 PandaX-II 束缚的暗物质质量 m DM> 0.7±0.2 TeV 导致 r≳ 2× 10− 3 。两者都在近期探测范围内。当我们包含质量为 M R∼ 10 14 GeV 的右手中微子时，允许的区域变得更宽，但我们仍然预测在大部分参数空间中 r≳ 10− 3 。如果我们允许 m DM、M R 和顶夸克质量的三参数调整，最保守的界限将变为 r> 10−5。
The observed Higgs mass indicates that the Standard Model can be valid up to near the Planck scale M P. Within this framework, it is important to examine how little modification is necessary to fit the recent experimental results in particle physics and cosmology. As a minimal extension, we consider the possibility that the Higgs field plays the role of inflaton and that the dark matter is the Higgs-portal scalar field. We assume that the extended Standard Model is valid up to the string scale 10 17 GeV.(This translates to the assumption that all the non-minimal couplings are not particularly large, ξ≲ 10 2, as in the critical Higgs inflation, since M P/10 2∼ 10 17 GeV.) We find a correlated theoretical bound on the tensor-to-scalar ratio r and the dark matter mass m DM. As a result, the Planck bound r< 0.09 implies that the dark-matter mass must be smaller than 1.1 TeV, while the PandaX-II bound on the dark-matter mass m DM> 0.7±0.2 TeV leads to r≳ 2× 10− 3. Both are within the range of near-future detection. When we include the right-handed neutrinos of mass M R∼ 10 14 GeV, the allowed region becomes wider, but we still predict r≳ 10− 3 in the most of the parameter space. The most conservative bound becomes r> 10− 5 if we allow three-parameter tuning of m DM, M R, and the top-quark mass.