作为相互作用暗能量探测手段的宇宙空洞径向速度统计
Radial velocity statistics of cosmic voids as a probe of interacting dark energy
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中文总结 AI 辅助
研究利用N体模拟，通过宇宙空洞径向速度统计来探测暗能量性质，发现其对3型相互作用暗能量模型参数敏感，在特定数据约束下有显著偏差，能为暗区相互作用提供独立可观测探测手段。
中文摘要 AI 辅助
由于宇宙空洞尺寸巨大且密度极低，其动力学在很大程度上与复杂的小尺度重子物理解耦，对宇宙背景膨胀高度敏感，使其成为暗能量性质的纯净且灵敏的探测器。利用N体模拟表明，空洞径向速度和速度弥散剖面对3型相互作用暗能量模型参数、动量耦合β（<0）和标量场参数λ敏感。在由普朗克CMB、DESI BAO和DES - Y5超新星数据约束的β和λ最佳拟合值的1σ范围内，相对于非耦合情形，空洞径向速度和速度弥散剖面跨度有高达约30%的偏差，可用四参数二次回归模型很好地近似。这表明空洞径向速度统计为3型模型中的暗区相互作用提供了一个独立且可观测的探测手段。
英文摘要
Due to their vast sizes and extremely low densities, the dynamics of cosmic voids are largely decoupled from complex, small-scale baryonic physics and are highly sensitive to the background expansion of the Universe. This makes them clean and sensitive probes of dark energy's properties. Using N-body simulations, we show that the void radial velocity and velocity dispersion profiles are sensitive to the Type 3 interacting dark energy model parameters, the momentum coupling $β$ ($<0$) and the scalar field parameter $λ$. Within the $1σ$ range of the best-fit values of $β$ and $λ$ constrained by Planck CMB, DESI BAO, and DES-Y5 supernova data, we find up to $\sim 30\%$ deviations in the void radial-velocity and velocity-dispersion profile spans relative to the uncoupled scenario, which can be well-approximated by a 4-parameter quadratic regression model. This demonstrates that the void radial velocity statistics provide an independent and observationally accessible probe of the dark-sector interaction in the Type 3 model.
