超越 $w_0-w_a$ 与幻影穿越：检验暗物质与暗能量耦合模型
Beyond $w_0-w_a$ and Phantom Crossing: Testing Models of Coupled Dark Sector
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中文总结 AI 辅助
本文提出暗物质质量依赖暗能量场的耦合模型，在玻尔兹曼求解器中实现并利用CMB、BAO和SNIa数据约束，实现幻影穿越，拟合优度媲美$w_0-w_a$参数化。
中文摘要 AI 辅助
宇宙微波背景辐射（CMB）测量与重子声学振荡（BAO）及Ia型超新星（SNIa）距离测量的结合表明，暗能量是动态的，其状态方程在低红移处穿越幻影分界线。这一特征无法在规范归一化、最小耦合、自相互作用的标量场模型中描述。我们研究通过引入暗区相互作用来实现幻影穿越的可能性，使得暗物质粒子质量依赖于暗能量场 $\phi$，关系为 $m \propto \phi^\alpha$。我们考虑具有反幂律形式 $V \propto \phi^{-\beta}$ 的自相互作用势。我们在玻尔兹曼求解器中在背景和微扰两个层面上实现该模型，并使用贝叶斯框架利用CMB、BAO和SNIa数据约束其参数。我们发现最佳拟合与常用的唯象 $w_0-w_a$ 参数化具有相似的拟合优度，为暗区提供了更基础的理解。
英文摘要
The combination of cosmic microwave background (CMB) measurements with distance measurements from baryon acoustic oscillations (BAO) and type Ia supernovae (SNIa) suggests that dark energy is dynamical, with an equation of state crossing the phantom divide at low redshifts. This feature can not be described within canonically normalized, minimally coupled, self-interacting scalar field models. We investigate the possibility of achieving phantom crossing by introducing an interaction in the dark sector such that the dark matter particle mass is dependent on the dark energy field $ϕ$ as $m \propto ϕ^α$. We consider a self-interacting potential of the inverse power-law form $V \propto ϕ^{-β}$. We implement this model both at the background and perturbative levels in a Boltzmann solver and use a bayesian framework to constrain its parameters using using CMB, BAO and SNIa data. We find best-fits that have similar goodness-of-fits as the commonly used phenomenological $w_0-w_a$ parameterization, providing a more fundamental understanding of the dark sector.
发表机构
- Instituto de Física Teórica da Universidade Estadual Paulista（圣保罗州立大学理论物理研究所）
- ICTP South American Institute for Fundamental Research（国际理论物理中心南美基础研究所）
- Department of Astronomy/Steward Observatory, University of Arizona（亚利桑那大学天文学系/斯图尔德天文台）
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