发表机构
Khon Kaen University（孔敬大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
在轴子门户中，SIMP暗物质场景因ALP约束而重新定位，通过黄酮尺度预测自相互作用截面，而非直接固定，从而保留预测能力。
AI 中文摘要
在强相互作用大质量粒子（SIMP）场景中，暗物质是一种伪南布-戈德斯通玻色子，其丰度由三到二的Wess-Zumino-Witten过程决定。我们在轴子门户中研究这一场景，发现规范机制所假设的动力学接触被亚GeV轴子类似粒子（ALPs）的约束所排除。暗扇区随后在其自身温度下冻结，因此遗迹丰度不再固定自相互作用截面，而是预测门户耦合。此外，门户算符是厄米的，且在ALP场中为偶性，因此不产生三线性ALP-π子耦合。接触项随后驱动ππ→aa过程，且没有抵消项，我们发现该转换比三线性估计快四个数量级。这不利于暗凝聚体单独产生ALP质量的最小实现。相反，存活的实现使ALP略重于暗π子。匹配观测丰度则固定黄酮真空期望值为V_φ≃1.1×10^10 GeV，并使暗尺度在超过一个数量级的范围内保持开放。衰变K^+→π^+a要求黄酮仅对轻子带电。该模型随后预测在暗π子质量为140 MeV时，暗物质自相互作用为0.20 cm^2/g，窗口范围从82到169 MeV。因此，SIMP框架的预测能力并未丧失，而是从自相互作用重新定位到黄酮尺度。
英文摘要
In the strongly interacting massive particle (SIMP) scenario, dark matter is a pseudo-Nambu--Goldstone boson whose abundance is set by a three-to-two Wess--Zumino--Witten process. We study this scenario in an axion portal and find that the kinetic contact the canonical mechanism assumes is excluded by bounds on sub-GeV axion-like particles (ALPs). The dark sector then freezes out at its own temperature, so the relic abundance no longer fixes the self-interaction cross section but predicts the portal coupling instead. Moreover, the portal operator is Hermitian and even in the ALP field, so no trilinear ALP--pion coupling arises. The contact term then drives $ππ\to aa$ with nothing to cancel against it, and we find the conversion four orders of magnitude faster than a trilinear estimate gives. This disfavours the minimal realisation in which the dark condensate alone generates the ALP mass. The realisation that survives instead makes the ALP slightly heavier than the dark pion. Matching the observed abundance then fixes the flavon vacuum expectation value at $V_ϕ\simeq 1.1\times10^{10} \ {\rm GeV}$ and leaves the dark scale open over more than an order of magnitude. The decay $K^+\toπ^+a$ requires the flavon to charge the leptons alone. The model then predicts a dark matter self-interaction of $0.20\,{\rm cm^2/g}$ at a dark pion mass of $140\ {\rm MeV}$, in a window running from $82$ to $169 \ {\rm MeV}$. The predictive power of the SIMP framework is therefore not lost but relocated, from the self-interaction to the flavon scale.
Comments52 pages, 6 figures, 5 tables
