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arXiv 2302.03056hep-phastro-ph.COhep-th
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随宇宙学演化的动力学混合

Cosmologically Varying Kinetic Mixing

Xucheng Gan, Di Liu

AI总结:

本研究构建由超轻CP偶标量控制的随宇宙演化的动力学混合机制,解决暗光子暗物质早期产生与晚期约束的矛盾,同时提出相关实验靶标并通过$\text{Z}_N$模型保证标量自然性。

摘要:

连接不可见区与可见区的门户是对暗世界最自然的解释之一。然而,通过该门户产生的早期暗物质面临着极其严格的晚期约束。为解决这一矛盾,我们构建了由标量控制的动力学混合,其随超轻CP偶标量的宇宙学演化而变化。为实现这一点并消除常数混合,我们将质量处于$10^{-33}\text{eV} \lesssim m_0 \ll \text{eV}$范围的超轻标量与重的双荷信使粒子耦合,并施加暗电荷共轭下的$\text{Z}_2$对称性。通过这种变化的混合,keV-MeV量级的暗光子暗物质在标量偏离原点时通过早期冻结产生,且在标量做阻尼振荡并动态设定动力学混合时不受晚期排除限制。我们还发现,标量-光子耦合从基础物理中涌现,这会改变宇宙学历史,并基于精细结构常数变化和等效原理破坏提供实验靶标。为确保标量的自然性,我们通过将最小模型嵌入$\text{Z}_N$保护的模型,离散地重建了破缺的平移对称性。当$N \text{∼} 10$时,标量质量的量子修正可被抑制到远低于$10^{-33}\text{eV}$。

英文摘要:

The portal connecting the invisible and visible sectors is one of the most natural explanations of the dark world. However, the early-time dark matter production via the portal faces extremely stringent late-time constraints. To solve such tension, we construct the scalar-controlled kinetic mixing varying with the ultralight CP-even scalar's cosmological evolution. To realize this and eliminate the constant mixing, we couple the ultralight scalar within $10^{-33}\text{eV} \lesssim m_0 \ll \text{eV}$ with the heavy doubly charged messengers and impose the $\mathbb{Z}_2$ symmetry under the dark charge conjugation. Via the varying mixing, the $\text{keV}-\text{MeV}$ dark photon dark matter is produced through the early-time freeze-in when the scalar is misaligned from the origin and free from the late-time exclusions when the scalar does the damped oscillation and dynamically sets the kinetic mixing. We also find that the scalar-photon coupling emerges from the underlying physics, which changes the cosmological history and provides the experimental targets based on the fine-structure constant variation and the equivalence principle violation. To ensure the scalar naturalness, we discretely re-establish the broken shift symmetry by embedding the minimal model into the $\mathbb{Z}_N$-protected model. When $N \sim 10$, the scalar's mass quantum correction can be suppressed much below $10^{-33}\text{eV}$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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