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Real- and redshift-space halo clustering in ƒ(R) cosmologies

机译:ƒ(R)宇宙学中的真实和红移空间光晕聚类

摘要

We present two-point correlation function statistics of the mass and the halos in the chameleon ƒ() modified gravity scenario using a series of large volume N-body simulations. Three distinct variations of ƒ() are considered (F4, F5 and F6) and compared to a fiducial ΛCDM model in the redshift range z∈[0,1]. We find that the matter clustering is indistinguishable for all models except for F4, which shows a significantly steeper slope. The ratio of the redshift- to real-space correlation function at scales 20hMpc agrees with the linear General Relativity (GR) Kaiser formula for the viable ƒ() models considered. We consider three halo populations characterized by spatial abundances comparable to that of luminous red galaxies (LRGs) and galaxy clusters. The redshift-space halo correlation functions of F4 and F5 deviate significantly from ΛCDM at intermediate and high redshift, as the ƒ() halo bias is smaller or equal to that of the ΛCDM case. Finally we introduce a new model independent clustering statistic to distinguish ƒ() from GR: the relative halo clustering ratio - . The sampling required to adequately reduce the scatter in will be available with the advent of the next generation galaxy redshift surveys. This will foster a prospective avenue to obtain largely model-independent cosmological constraints on this class of modified gravity models.
机译:我们使用一系列大体积N体模拟,介绍了变色龙ƒ()修正重力场景中质量和光晕的两点相关函数统计。考虑了ƒ()的三个不同变化(F4,F5和F6),并将其与基准偏移CDM模型在红移范围z∈[0,1]中进行了比较。我们发现,除F4以外,所有模型的物质聚类都无法区分,后者显示出明显更陡的斜率。比例大于20hMpc的红移与实空间相关函数之比与所考虑的ƒ()模型的线性广义相对论(GR)Kaiser公式一致。我们考虑了三个光晕种群,其特征是空间丰度可与发光红色星系(LRG)和星系团相媲美。 F4和F5的红移-空间晕轮相关函数在中和高红移时明显偏离ΛCDM,因为ƒ()晕轮偏差小于或等于ΛCDM情况。最后,我们介绍了一种新的模型独立聚类统计量,以将ƒ()与GR区别开:相对晕轮聚类比率-。随着下一代星系红移测量的到来,可以充分减少散射所需的采样。这将为在这类修正重力模型上获得很大程度上与模型无关的宇宙学约束提供一条前途。

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