AI 中文总结
研究暗轴子与暗重子相互作用，通过在玻尔兹曼代码中实现相关模型并与CMB、DESI DR₂ BAO和SNe Ia数据对比，发现最佳拟合模型改善了拟合，其暗物质质量演化呈现非单调变化，产生类似早期暗能量的能量注入但对降低当前张力作用有限。
AI 中文摘要
暗物质与暗能量之间的相互作用可导致表观幽灵穿越行为，模仿了最新宇宙学观测所偏好的膨胀历史。此前曾提出一个具体的粒子物理实现，由强耦合暗区组成，其中暗轴子与暗重子耦合。本文通过将其预测与最新宇宙学数据比较进一步研究。在玻尔兹曼代码中实现暗轴子 - 暗重子相互作用模型，并与CMB、DESI DR2 BAO和SNe Ia数据对比。对于CMB + DESI DR2 + DES - Dovekie组合，最佳拟合模型相对于ΛCDM改善了拟合，Δχ² = - 14.48。优选解呈现非单调暗物质质量演化，在物质 - 辐射相等和复合之间质量下降，在BAO/SNe敏感时期增加，导致有效暗能量描述中出现表观幽灵穿越。有趣的是，相同动力学在物质 - 辐射相等附近产生类似早期暗能量的能量注入，但在数据优选区域该成分太小，无法大幅提高H₀以降低当前张力。
英文摘要
Interactions between dark matter and dark energy can lead to an apparent phantom-crossing behavior that mimics the expansion history preferred by the latest cosmological observations from DESI baryon acoustic oscillations (BAO), Cosmic Microwave Background (CMB), and Type Ia supernovae (SNe Ia) data. In a previous paper [Khoury, Lin, and Trodden 2025 arXiv:2503.16415], we proposed a concrete particle physics realization of this idea, consisting of a strongly coupled dark sector in which a dark axion is coupled to dark baryons. In this paper, we investigate this idea further by comparing its predictions to the latest cosmological data. We implement the dark axion-dark baryon interaction model in a Boltzmann code and confront it with CMB, DESI DR2 BAO, and SNe Ia data. For the CMB+DESI DR2+DES-Dovekie combination, the best-fit model improves the fit relative to $Λ$CDM by $Δχ^2=-14.48$. The preferred solution exhibits a non-monotonic dark-matter mass evolution: the mass decreases between matter-radiation equality and recombination, while increasing over the BAO/SNe-sensitive epoch, leading to an apparent phantom crossing in an effective dark-energy description. Interestingly, the same dynamics produces an Early Dark Energy-like energy injection near matter-radiation equality, but in the data-preferred region this component is too small to raise $H_0$ enough to substantially reduce the current tension.
CommentsAdd more references. 13 pages, 6 figures, 3 tables
