INAF-Observatorio Astronomico, di Brera, Via Emilio Bianchi, 46, I-23807 Merate (LC), Italy.
Department of Physics, Institute for Computational Cosmology, Durham University, Durham DH1 3LE, United Kingdom.
Phys Rev Lett. 2015 Aug 14;115(7):071306. doi: 10.1103/PhysRevLett.115.071306.
We introduce the idea of an effective dark matter halo catalog in f(R) gravity, which is built using the effective density field. Using a suite of high resolution N-body simulations, we find that the dynamical properties of halos, such as the distribution of density, velocity dispersion, specific angular momentum and spin, in the effective catalog of f(R) gravity closely mimic those in the cold dark matter model with a cosmological constant (ΛCDM). Thus, when using effective halos, an f(R) model can be viewed as a ΛCDM model. This effective catalog therefore provides a convenient way for studying the baryonic physics, the galaxy halo occupation distribution and even semianalytical galaxy formation in f(R) cosmologies.
我们在$f(R)$引力中引入了有效暗物质晕目录的概念，该目录是使用有效密度场构建的。使用一系列高分辨率的 N 体模拟，我们发现晕的动力学性质，如有效$f(R)$引力目录中的密度分布、速度弥散、比角动量和自旋，与具有宇宙学常数（$\Lambda$CDM）的冷暗物质模型非常相似。因此，当使用有效晕时，$f(R)$模型可以看作是$\Lambda$CDM 模型。这个有效目录因此为研究重子物理、星系晕占据分布甚至半分析星系形成提供了一种在$f(R)$宇宙学中的便利方法。
