A new test of f(R) gravity with the cosmological standard rulers in radio quasars
A new test of f(R) gravity with the cosmological standard rulers in radio quasars
复制标题
射电类星体中宇宙学标准尺对 f(R) 引力的新检验
DOI：
10.1088/1475-7516/2018/06/042
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发表时间：
2017-08
影响因子：
6.4
通讯作者：
Zong-Hong Zhu
中科院分区：
文献类型：
--
作者：
Tengpeng Xu;Shuo Cao;Jingzhao Qi;Marek Biesiada;Xiaogang Zheng;Zong-Hong Zhu
作为替代暗能量的一种重要引力理论，一类f（R）修正引力在Einstein-Hilbert作用量中引入了Ricci标量R的微扰，已被广泛应用于宇宙学中解释宇宙的加速度。本文重点介绍了最近公布的中光度类星体致密结构的VLBI观测结果，并结合星系团的角直径距离测量，其中包括红移范围为0.023 ≤ z ≤ 2.80的145个宇宙学标准标尺，研究Palatini形式主义中f（R）理论中两个可行模型的观测约束：f1（R）= R-a/Rb和f2（R）= R-aR/R+ab。我们还将单个标准标尺数据与CMB和BAO的观测值相结合，这提供了严格的约束。此外，还利用模型诊断技术Om（z）和状态发现器（statefinder）对f（R）模型和ΛCDM模型进行了区分。我们的结果表明：（1）类星体样本对两个f（R）宇宙学有很好的约束作用，这表明类星体样本有潜力成为其他宇宙学标准统治者的有力补充探针。(2)在两个f（R）宇宙学中对应于B = 0的ΛCDM模型仍然包含在1σ范围内。然而，仍然存在着某些可能性，即ΛCDM可能不是当前高红移观测所首选的最佳宇宙学模型。(3)在当前标准标尺数据下，信息量准则表明宇宙常数模型仍然是最好的模型，而f1（R）模型得到的观测支持最小。(4)早期的f2（R）模型与f1（R）模型有很大的不同，但目前仍明显偏离f1（R）和ΛCDM模型。
As an important candidate gravity theory alternative to dark energy, a class of f(R) modified gravity, which introduces a perturbation of the Ricci scalar R in the Einstein-Hilbert action, has been extensively applied to cosmology to explain the acceleration of the universe. In this paper, we focus on the recently-released VLBI observations of the compact structure in intermediate-luminosity quasars combined with the angular-diameter-distance measurements from galaxy clusters, which consists of 145 data points performing as individual cosmological standard rulers in the redshift range 0.023 ≤ z ≤ 2.80, to investigate observational constraints on two viable models in f(R) theories within the Palatini formalism: f1(R) = R−a/Rb and f2(R)=R−aR/R+ab. We also combine the individual standard ruler data with the observations of CMB and BAO, which provides stringent constraints. Furthermore, two model diagnostics, Om(z) and statefinder, are also applied to distinguish the two f(R) models and ΛCDM model. Our results show that (1) The quasars sample performs very well to place constraints on the two f(R) cosmologies, which indicates its potential to act as a powerful complementary probe to other cosmological standard rulers. (2) The ΛCDM model, which corresponds to b = 0 in the two f(R) cosmologies is still included within 1σ range. However, there still exists some possibility that ΛCDM may not the best cosmological model preferred by the current high-redshift observations. (3) Given the current standard ruler data, the information criteria indicate that the cosmological constant model is still the best one, while the f1(R) model gets the smallest observational support. (4) The f2(R) model, which evolves quite different from f1(R) model at early times, still significantly deviates from both f1(R) and ΛCDM model at the present time.
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影响因子：
64.8
作者：
K. Kellermann
通讯作者：
K. Kellermann
影响因子：
4.4
作者：
Kai Liao;Zong-hong Zhu
通讯作者：
Kai Liao;Zong-hong Zhu
DOI：
10.1051/0004-6361/201527645
发表时间：
2016-01
期刊：
arXiv: Cosmology and Nongalactic Astrophysics
影响因子：
--
作者：
M. V. Santos;H. Winther;D. Mota;I. Waga
通讯作者：
M. V. Santos;H. Winther;D. Mota;I. Waga
组合角直径距离的宇宙状态方程：与光度距离的张力是否存在？
影响因子：
5
作者：
Cao Shuo;Zhu Zong-Hong
通讯作者：
Zhu Zong-Hong
影响因子：
4.4
作者：
Dolgov, AD;Kawasaki, M
通讯作者：
Kawasaki, M