Constraints on f(R) cosmologies from strong gravitational lensing systems
Constraints on f(R) cosmologies from strong gravitational lensing systems
复制标题
DOI：
10.1016/j.physletb.2012.06.062
复制
发表时间：
2012-07
影响因子：
4.4
通讯作者：
Kai Liao;Zong-hong Zhu
中科院分区：
文献类型：
--
作者：
Kai Liao;Zong-hong Zhu
f（R）引力被认为是暗能量的替代物，可以解释宇宙的加速。本文用Hubble常数独立的两个角直径距离之比D=Dls/Ds来约束Palatini方法中的f（R）模型[公式见正文]。这些数据来自各种大型系统的透镜调查和星系团的透镜与X射线观测相结合。我们还将联合收割机的透镜数据与CMB和BAO相结合，这给出了严格的约束。最佳拟合结果为（α，β）=（− 1.50，0.696）或（Ωm，β）=（0.0734，0.696）。当结合CMB和BAO时，最佳拟合结果为（α，β）=（− 3.75，0.0651）或（Ωm，β）=（0.286，0.0651）。如果我们进一步固定β=0（对应于ΛCDM），则对于透镜分析，α的最佳拟合值分别为α=-4.84-0.68 +0.91（1σ）-0.98 +1.63（2σ），对于组合数据，α=-4.35-0.16 +0.18（1σ）-0.25 +0.3（2σ）。结果表明，ΛCDM模型在1σ范围内.
f(R) gravity is thought to be an alternative to dark energy which can explain the acceleration of the universe. It has been tested by different observations including type Ia supernovae (SNIa), the cosmic microwave background (CMB), the baryon acoustic oscillations (BAO) and so on. In this Letter, we use the Hubble constant independent ratio between two angular diameter distances D=Dls/Dsto constrain f(R) model in Palatini approach [Formula: see text] . These data are from various large systematic lensing surveys and lensing by galaxy clusters combined with X-ray observations. We also combine the lensing data with CMB and BAO, which gives a stringent constraint. The best-fit results are (α,β)=(−1.50,0.696) or (Ωm,β)=(0.0734,0.696) using lensing data only. When combined with CMB and BAO, the best-fit results are (α,β)=(−3.75,0.0651) or (Ωm,β)=(0.286,0.0651). If we further fix β=0 (corresponding to ΛCDM), the best-fit value for α is α=−4.84−0.68+0.91(1σ)−0.98+1.63(2σ) for the lensing analysis and α=−4.35−0.16+0.18(1σ)−0.25+0.3(2σ) for the combined data, respectively. Our results show that ΛCDM model is within 1σ range.