arXiv 2108.025402021-08hep-ph

亚稳宇宙中的轻暴胀子模型

Light inflaton model in a metastable Universe

Fedor Bezrukov, Abigail Keats

备注：: 22 pages, 2 figures Version accepted in PRD, improved plots
DOI：: 10.1103/PhysRevD.104.075020

摘要：

我们最小限度地延长SM与Z $_2$对称的潜力包含一个单一的标量场，作为我们的暴胀子与四次自耦合。在这个模型中，我们在两个扇区都有对称性破缺，加上一个暴胀子-希格斯门，宇宙能够通过2-2暴胀子-希格斯散射有效地重新加热。假设具有正宇宙学常数的宇宙应该是亚稳态的，那么在真空中只有一种特定的对称性破缺模式是可能的，而不需要微调希格斯的四次自耦合。质量在$O(10^{-3})\leq m_χ\leq m_{h}$范围内的膨胀子和跨越$θ_{m}^{2}=O(10^{-11}-10^{-2})$的混合角避开了亚稳态EW真空所需的所有当前宇宙学、实验和稳定性约束。升级后的粒子物理实验也许能够用$θ_{m}^{2}\geq O(10^{-4})$探测参数空间，在那里我们将观察到三线性希格斯耦合被高达$2\%$的SM值所抑制。然而，为了访问非常弱耦合的暴胀子的参数空间，我们依赖于建立针对隐藏扇区的实验的建议。

英文摘要：

We minimally extend the SM with a Z$_2$ symmetric potential containing a single scalar field, serving as our inflaton with a quartic self-coupling. In the model we have symmetry breaking in both sectors, and with the addition of an inflaton-Higgs portal, the Universe is able to efficiently reheat via 2-2 inflaton-Higgs scattering. Assuming that the Universe with a positive cosmological constant should be metastable, only one particular symmetry breaking pattern in the vacuum is possible, without the need to finely-tune the Higgs' quartic self-coupling. Inflaton with masses in the range $O(10^{-3})\leq m_χ\leq m_{h}$ and mixing angles that span $θ_{m}^{2}=O(10^{-11}-10^{-2})$ evade all current cosmological, experimental and stability constraints required for a metastable EW vacuum. Upgraded particle physics experiments may be able to probe the parameter space with $θ_{m}^{2}\geq O(10^{-4})$, where we would observe trilinear Higgs couplings suppressed by up to $2\%$ compared to the SM value. However to access the parameter space of very weakly-coupled inflaton, we rely on the proposals to build experiments that target the hidden sector.

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