论文标题
修改的重力或不完美的暗物质：独立于模型的歧视
Modified gravity or imperfect dark matter: a model-independent discrimination
论文作者
论文摘要
我们分析了如何以模型无关的方式参数对暗物质扰动方程的一般修改。我们证明，在改良的重力场景中具有散装和剪切粘度和热通量的不完美和不受欢迎的暗物质流体的通用模型可以用五个一般的时间和规模函数来描述。我们专注于准静态近似中的亚与超边缘机制，并计算出星系分布，星系速度和弱透镜的可观察功率谱，并发现这些可观察到的物品仅对最初五个函数的三种组合敏感。这三个可观察功能相对于$ \ mathrm {λcdm} $的偏差赋予了我们不同的特征信号，这使我们能够确定在哪种情况下可以区分重力的修改与不完美或未经保存的暗物质。最后，我们对这三个参数进行了Fisher的预测分析，并为具有剪切粘度的特定模型展示了一个示例。
We analyze how to parametrize general modifications of the dark matter perturbations equations in a model-independent way. We prove that a general model with an imperfect and non-conserved dark matter fluid with bulk and shear viscosities and heat flux in a modified gravity scenario can be described with five general functions of time and scale. We focus on the sub-Hubble regime within the quasi-static approximation and calculate the observable power spectra of the galaxy distribution, galaxy velocities and weak lensing and find that these observables are only sensitive to three combinations of the initial five functions. Deviations of these three observable functions with respect to $\mathrm{ΛCDM}$ give us different characteristic signals which allow us to determine in which cases it is possible to discriminate a modification of gravity from an imperfect or non-conserved dark matter. Finally, we perform a Fisher forecast analysis for these three parameters and show an example for a particular model with shear viscosity.
