标题： 结构形成理论的结构 显示英文标题

标题： The Structure of Structure Formation Theories

摘要： 我们研究结构形成模型的一般结构，并将其应用于从观测中反向工程模型。 通过仔细计算协变引力不稳定性理论中的自由度，我们表明结构的演化完全由暗物质区的应力历史所指定。 对平滑、熵、音速、标量各向异性、矢量各向异性和张量各向异性应力的研究揭示了特定模型现象的起源、稳健性和唯一性。 我们构建了有用且具有说明性的解析解，涵盖了多种不同状态方程的组分情况，这与当前一代模型相关，特别是那些具有有效平滑组分的模型。 我们提出一个简单的案例研究，研究具有类似于LambdaCDM模型现象学的模型，以突出反向工程问题。 一个由单一类型的暗物质主导且密度临界宇宙可以精确地模仿LambdaCDM模型。 显示英文摘要

摘要： We study the general structure of models for structure formation, with applications to the reverse engineering of the model from observations. Through a careful accounting of the degrees of freedom in covariant gravitational instability theory, we show that the evolution of structure is completely specified by the stress history of the dark sector. The study of smooth, entropic, sonic, scalar anisotropic, vector anisotropic, and tensor anisotropic stresses reveals the origin, robustness, and uniqueness of specific model phenomenology. We construct useful and illustrative analytic solutions that cover cases with multiple species of differing equations of state relevant to the current generation of models, especially those with effectively smooth components. We present a simple case study of models with phenomenologies similar to that of a LambdaCDM model to highlight reverse-engineering issues. A critical-density universe dominated by a single type of dark matter with the appropriate stress history can mimic a LambdaCDM model exactly.