Multicomponent dark matter in extended U(1)B−L: neutrino mass and high scale validity
Multicomponent dark matter in extended U(1)B−L: neutrino mass and high scale validity
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DOI：
10.1088/1475-7516/2020/04/013
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发表时间：
2020-04
影响因子：
6.4
通讯作者：
S. Bhattacharya;N. Chakrabarty;R. Roshan;A. Sil
中科院分区：
文献类型：
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作者：
S. Bhattacharya;N. Chakrabarty;R. Roshan;A. Sil
尽管受到遗迹密度、直接搜索和希格斯真空稳定性的严重限制，但在附加 U(1)B−L 规范对称性下带电的右手中微子的标准模型为暗物质 (DM) 问题和中微子质量生成提供了解决方案。因此，我们研究了通过额外的惰性标量双峰增强的多组分 DM 场景，该双峰在 U(1)BL−L 下呈中性，这有助于扩大 DM 约束和希格斯真空稳定性允许的参数空间。最轻的右手中微子和 CP 偶惰性标量被视为暗物质候选者，并构成了一个二元暗物质框架，因为它们通过不间断的 ℤ2 × ℤ2′ 对称性而变得稳定。 DM-DM 转换过程对于在 RH 中微子质量区域提供必要的遗迹丰度至关重要，而这些区域在独立的 U(1)BL−L 情景中不会出现。此外，该模型中的单环重正化群（RG）方程表明，在与观测遗迹、直接检测界限和其他相关约束兼容的参数区域中，电弱（EW）真空可以稳定到～109 GeV。我们最后评论了在同一设置中包含冻结机制的可能性。
Standard Model with right handed neutrinos charged under additional U(1)B−L gauge symmetry offer solutions to both dark matter (DM) problem and neutrino mass generation, although constrained severely from relic density, direct search and Higgs vacuum stability. We therefore investigate a multicomponent DM scenario augmented by an extra inert scalar doublet, that is neutral under U(1)B−L, which aids to enlarge parameter space allowed by DM constraints and Higgs vacuum stability. The lightest right-handed neutrino and the CP-even inert scalar are taken as the dark matter candidates and constitute a two component dark matter framework as they are rendered stable by an unbroken ℤ2 × ℤ2′ symmetry. DM-DM conversion processes turn out crucial to render requisite relic abundance in mass regions of the RH neutrino that do not appear in the stand-alone U(1)B−L scenario. In addition, the one-loop renormalisation group (RG) equations in this model demonstrate that the electroweak (EW) vacuum can be stabilised till ∼ 109 GeV in a parameter region compatible with the observed relic, the direct detection bound and other relevant constraints. We finally comment on the possibility of including the freeze-in mechanism in the same set-up.