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arXiv 1808.01784astro-ph.CO
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局部数据对距离对偶关系的新约束

New constraints on the distance duality relation from the local data

Hai-Nan Lin, Ming-Hua Li, Xin Li

摘要:

宇宙距离对偶关系(DDR)是宇宙学中的一个重要关系,它通过一个简单的公式$D_A(z)(1+z)^2/D_L(z)\equiv1$将角直径距离和光度距离联系起来。因此,对DDR的有效性进行测试具有重要意义。在本文中,我们使用现有的本地数据,包括Ia型超新星(SNe Ia),星系团和重子声学振荡(BAO)测试DDR的可能违反。我们将修改后的DDR写为$D_A(z)(1+z)^2/D_L(z)=η(z)$,并考虑$η(z)$的两种不同参数化,即$η_1(z)=1+η_0 z$和$η_2(z)=1+η_0 z/(1+z)$。比较了Ia超新星的光度距离与相同红移下星系团和BAO的角直径距离。这里使用两种不同的聚类数据,即椭圆聚类和球形聚类。参数$η_0$是使用马尔可夫链蒙特卡罗方法获得的。发现$η_0$可以被椭圆星系团+ BAO数据严格约束,第一次和第二次参数化的最佳拟合值分别为$η_0=-0.04\pm 0.12$和$η_0=-0.05\pm 0.22$.然而,由于大的内在散射,球形团簇+ BAO数据不能严格约束$η_0$。在本报告所研究的任何案件中,都没有发现违反解除武装、复员和重返社会的证据。

英文摘要:

The cosmic distance duality relation (DDR), which connects the angular diameter distance and luminosity distance through a simple formula $D_A(z)(1+z)^2/D_L(z)\equiv1$, is an important relation in cosmology. Therefore, testing the validity of DDR is of great importance. In this paper, we test the possible violation of DDR using the available local data including type Ia supernovae (SNe Ia), galaxy clusters and baryon acoustic oscillations (BAO). We write the modified DDR as $D_A(z)(1+z)^2/D_L(z)=η(z)$, and consider two different parameterizations of $η(z)$, namely $η_1(z)=1+η_0 z$ and $η_2(z)=1+η_0 z/(1+z)$. The luminosity distance from SNe Ia are compared with the angular diameter distance from galaxy clusters and BAO at the same redshift. Two different cluster data are used here, i.e. elliptical clusters and spherical clusters. The parameter $η_0$ is obtained using the Markov chain Monte Carlo methods. It is found that $η_0$ can be strictly constrained by the elliptical clusters + BAO data, with the best-fitting values $η_0=-0.04\pm 0.12$ and $η_0=-0.05\pm 0.22$ for the first and second parametrizations, respectively. However, the spherical clusters + BAO data couldn't strictly constrain $η_0$ due to the large intrinsic scatter. In any case studied here, no evidence for the violation of DDR is found.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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