AI 中文总结
研究通过场论模型统一暗区，将其描述为声速为零的单一理想流体，避免幻像行为，包含标准ΛCDM。基于单个标量场构建框架，分析特定示例可重现DESI最佳拟合CPL演化，用相同参数展现有效演化暗能量。
AI 中文摘要
我们引入了一类新颖的场论模型，该模型将暗区统一描述为一种声速为零的单一理想流体。这些模型还允许对冷暗物质与真空能量相互作用进行解释，同时避免任何幻像行为，并将标准的ΛCDM作为一个特殊情况包含在内。基于在横向微分同胚下不变的单个标量场构建，该框架自然地实现了所谓模拟模型中施加的约束。我们分析了一个展示有效演化暗能量的特定简单示例，发现它可以用相同数量的自由参数重现DESI的最佳拟合CPL演化。
英文摘要
We introduce a novel class of field-theory models that provide a unified description of the dark sector as a single perfect fluid with vanishing sound speed. These models also admit the interpretation of cold dark matter interacting with vacuum energy while avoiding any phantom behavior and including standard $Λ$CDM as a particular case. Built upon a single scalar field invariant under transverse diffeomorphisms, the framework naturally implements the constraints imposed in the so called mimetic models. We analyze a particular simple example exhibiting an effectively evolving dark energy and find that it can reproduce the DESI best-fit CPL evolution with the same number of free parameters.
Comments22 pages, 4 figures
