论文标题
位置依赖性物质密度概率分布函数
The position-dependent matter density probability distribution function
论文作者
论文摘要
我们将平滑物质场的位置依赖性概率分布函数（PDF）作为宇宙学可观察到。与PDF本身相比，依赖位置的PDF的空间变化更简单地模型，并且对宇宙参数具有明显的依赖性。我们证明了依赖位置的PDF的特征是局部平均密度的变化，并且我们使用单独的宇宙N体模拟计算PDF对局部密度的线性响应。 PDF对局部密度场的线性响应可以被认为是基于密度选择物质场区域的线性偏置。我们为线性响应提供了一个模型，该模型可以准确预测我们的仿真测量。我们还使用全球宇宙模拟来验证我们的结果并测试本地PDF的单独宇宙一致性关系。我们发现两者之间的出色一致性，我们证明了单独的宇宙方法给出了线性响应的较低方差确定。
We introduce the position-dependent probability distribution function (PDF) of the smoothed matter field as a cosmological observable. In comparison to the PDF itself, the spatial variation of the position-dependent PDF is simpler to model and has distinct dependence on cosmological parameters. We demonstrate that the position-dependent PDF is characterized by variations in the local mean density, and we compute the linear response of the PDF to the local density using separate universe N-body simulations. The linear response of the PDF to the local density field can be thought of as the linear bias of regions of the matter field selected based on density. We provide a model for the linear response, which accurately predicts our simulation measurements. We also validate our results and test the separate universe consistency relation for the local PDF using global universe simulations. We find excellent agreement between the two, and we demonstrate that the separate universe method gives a lower variance determination of the linear response.
