We report five measurements of the transverse baryonic acoustic scale, $\theta_{BAO}$, obtained from the angular two-point correlation function calculation for Luminous Red Galaxies of the eleventh data release of the Sloan Digital Sky Survey (SDSS). Each measurement has been obtained by considering a thin redshift shell ($\delta z = 0.01$ and $0.02$) in the interval $ z \in [0.565, 0.660] $, which contains a large density of galaxies ($\sim 20,000$ galaxies/redshift shell). Differently from the three-dimensional Baryon Acoustic Oscillations (BAO) measurements, these data points are obtained almost model-independently and provide a Cosmic Microwave Background (CMB)-independent way to estimate the sound horizon $ r_s $. Assuming a time-dependent equation-of-state parameter for the dark energy, we also discuss constraints on the main cosmological parameters from $\theta_{BAO}$ and CMB data.

中文翻译：

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SDSS DR11 星系的横向重子声标

我们报告了横向重子声学尺度 $\theta_{BAO}$ 的五个测量值，该测量值是从斯隆数字巡天 (SDSS) 第十一次数据发布的发光红色星系的角两点相关函数计算中获得的。每次测量都是通过考虑区间 $ z \in [0.565, 0.660] $ 中的薄红移壳（$\delta z = 0.01$ 和 $0.02$）获得的，其中包含大密度的星系（$\sim 20,000$星系/红移壳）。与三维重子声学振荡 (BAO) 测量不同，这些数据点几乎是独立于模型获得的，并提供了一种独立于宇宙微波背景 (CMB) 的方法来估计声视界 $ r_s $。假设暗能量的状态方程参数与时间有关，