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arXiv 1705.04549astro-ph.COastro-ph.GA
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用时间延迟透镜探测宇宙距离对偶关系

Probing the cosmic distance duality relation using time delay lenses

Akshay Rana, Deepak Jain, Shobhit Mahajan, Amitabha Mukherjee, R. F. L. Holanda

摘要:

宇宙距离-对偶关系(CDDR)的构造已被广泛研究。然而,它与各种新的观测值的一致性仍然是一个感兴趣的话题。我们提出了一种新的方法来约束CDDR $η(z)$使用不同的动力学和几何性质的强引力透镜(SGL)以及SNe Ia观测。我们使用$102$ SGL样本并测量相应的速度色散$σ_0$和爱因斯坦半径$θ_E$。此外,我们还使用了一个数据集的$12$两个图像透镜系统包含测量的时间延迟$Δt$之间的源图像。这两个数据集共同为我们提供了晶状体的角直径距离$D_{A_{ol}}$。此外,对于光度距离,我们使用的$740$观测从JLA汇编的SNe Ia。为了研究这些数据集的组合行为,我们使用模型独立的方法,高斯过程(GP)。我们还检查了GP的效率,通过将其应用于模拟数据集,这是通过使用现实的宇宙学误差棒以唯象的方式产生的。最后,我们得出结论,SGL和SNe Ia观测的组合边界不支持CDDR的任何偏差,并且在$2σ$置信区域内与标准值($η=1$)一致,这进一步加强了CDDR的理论接受。

英文摘要:

The construction of the cosmic distance-duality relation (CDDR) has been widely studied. However, its consistency with various new observables remains a topic of interest. We present a new way to constrain the CDDR $η(z)$ using different dynamic and geometric properties of strong gravitational lenses (SGL) along with SNe Ia observations. We use a sample of $102$ SGL with the measurement of corresponding velocity dispersion $σ_0$ and Einstein radius $θ_E$. In addition, we also use a dataset of $12$ two image lensing systems containing the measure of time delay $Δt$ between source images. Jointly these two datasets give us the angular diameter distance $D_{A_{ol}}$ of the lens. Further, for luminosity distance, we use the $740$ observations from JLA compilation of SNe Ia. To study the combined behavior of these datasets we use a model independent method, Gaussian Process (GP). We also check the efficiency of GP by applying it on simulated datasets, which are generated in a phenomenological way by using realistic cosmological error bars. Finally, we conclude that the combined bounds from the SGL and SNe Ia observation do not favor any deviation of CDDR and are in concordance with the standard value ($η=1$) within $2σ$ confidence region, which further strengthens the theoretical acceptance of CDDR.

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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