Effects of a Time-Varying Color-Luminosity Parameter β on the Cosmological Constraints of Modified Gravity Models

Effects of a Time-Varying Color-Luminosity Parameter β on the Cosmological Constraints of Modified Gravity Models
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时变颜色光度参数 β 对修正引力模型的宇宙学约束的影响

DOI:
10.1088/0253-6102/62/6/23
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发表时间:
2014-07
影响因子:
3.1
通讯作者:
张鑫
张鑫
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
王爽;王永贞;张鑫

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我们发现,在超新星遗产调查3年(SNLS3)的数据中,有强有力的证据表明颜色-光度参数的红移-演化。在以前的研究中,只有暗能量(DE)模型被用来探索时变?关于参数估计。在本文中,我们将讨论扩展到修正重力(MG)的情况,通过考虑Dvali?Gabadadze吗?Porrati (DGP)模型、幂律型f(T)模型和指数型f(T)模型。除了SNLS3数据外,我们还使用了最新的普朗克距离先验数据、从斯隆数字巡天(SDSS)数据发布7号(DR7)和重子振荡光谱巡天(BOSS)中提取的星系群集(GC)数据,以及哈勃太空望远镜(HST)观测直接测量的哈勃常数H0。我们发现,对于单独使用超新星(SN)数据和组合使用所有数据的两种情况,添加参数?能减吗?所有MG模型都是2 × ~ 36,这表明这是一个常数?6点被排除在外?置信水平(CL)。此外,我们发现一个时变的?总是产生更大的分数物质密度?m0和更小的简化哈勃常数h;此外,它显著地改变了1?和2 ?不同MG模型的置信区域,从而校正参数估计的系统偏差。这些结论与DE模型的结果一致,表明?宇宙的演化完全独立于背景中的宇宙模型。因此,我们的工作强调了考虑?在宇宙学中,这是合适的。
It has been found that, for the Supernova Legacy Survey three-year (SNLS3) data, there is strong evidence for the redshift-evolution of color-luminosity parameter ?. In previous studies, only dark energy (DE) models are used to explore the effects of a time-varying ? on parameter estimation. In this paper, we extend the discussions to the case of modified gravity (MG), by considering Dvali?Gabadadze?Porrati (DGP) model, power-law type f(T) model and exponential type f(T) model. In addition to the SNLS3 data, we also use the latest Planck distance priors data, the galaxy clustering (GC) data extracted from Sloan Digital Sky Survey (SDSS) data release 7 (DR7) and Baryon Oscillation Spectroscopic Survey (BOSS), as well as the direct measurement of Hubble constant H0 from the Hubble Space Telescope (HST) observation. We find that, for both cases of using the supernova (SN) data alone and using the combination of all data, adding a parameter of ? can reduce ?2 by ~ 36 for all the MG models, showing that a constant ? is ruled out at 6? confidence level (CL). Moreover, we find that a time-varying ? always yields a larger fractional matter density ?m0 and a smaller reduced Hubble constant h; in addition, it significantly changes the shapes of 1? and 2? confidence regions of various MG models, and thus corrects systematic bias for the parameter estimation. These conclusions are consistent with the results of DE models, showing that ?'s evolution is completely independent of the cosmological models in the background. Therefore, our work highlights the importance of considering the evolution of ? in the cosmology-fits.
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