We present cosmological parameter measurements from the publicly available Baryon Oscillation Spectroscopic Survey (BOSS) data on anisotropic galaxy clustering in Fourier space. Compared to previous studies, our analysis has two main novel features. First, we use a complete perturbation theory model that properly takes into account the non-linear effects of dark matter clustering, short-scale physics, galaxy bias, redshift-space distortions, and large-scale bulk flows. Second, we employ a Markov-Chain Monte-Carlo technique and consistently reevaluate the full power spectrum likelihood as we scan over different cosmologies. Our baseline analysis assumes minimal $\Lambda$CDM, varies the neutrino masses within a reasonably tight range, fixes the primordial power spectrum tilt, and uses the big bang nucleosynthesis prior on the physical baryon density $\omega_b$. In this setup, we find the following late-Universe parameters: Hubble constant $H_0=(67.9\pm 1.1)$ km$\,$s$^{-1}$Mpc$^{-1}$, matter density fraction $\Omega_m=0.295\pm 0.010$, and the mass fluctuation amplitude $\sigma_8=0.721\pm 0.043$. These parameters were measured directly from the BOSS data and independently of the Planck cosmic microwave background observations. Scanning over the power spectrum tilt or relaxing the other priors do not significantly alter our main conclusions. Finally, we discuss the information content of the BOSS power spectrum and show that it is dominated by the location of the baryon acoustic oscillations and the power spectrum shape. We argue that the contribution of the Alcock-Paczynski effect is marginal in $\Lambda$CDM, but becomes important for non-minimal cosmological models.

中文翻译：

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来自 BOSS 星系功率谱的宇宙学参数

我们从公开可用的重子振荡光谱调查 (BOSS) 数据中展示了关于傅立叶空间中各向异性星系团簇的宇宙学参数测量值。与之前的研究相比，我们的分析有两个主要的新特点。首先，我们使用了一个完整的微扰理论模型，该模型适当地考虑了暗物质聚类、短尺度物理、星系偏差、红移空间畸变和大尺度体流的非线性效应。其次，我们采用马尔可夫链蒙特卡罗技术，并在我们扫描不同的宇宙学时始终如一地重新评估全功率谱似然。我们的基线分析假设 $\Lambda$CDM 最小，在合理紧密的范围内改变中微子质量，修复原始功率谱倾斜，并在物理重子密度 $\omega_b$ 上使用先验的大爆炸核合成。在此设置中，我们找到以下晚宇宙参数： 哈勃常数 $H_0=(67.9\pm 1.1)$ km$\,$s$^{-1}$Mpc$^{-1}$, 物质密度分数$\Omega_m=0.295\pm 0.010$，质量波动幅度$\sigma_8=0.721\pm 0.043$。这些参数是直接从 BOSS 数据测量的，独立于普朗克宇宙微波背景观测。扫描功率谱倾斜或放宽其他先验不会显着改变我们的主要结论。最后，我们讨论了 BOSS 功率谱的信息内容，并表明它受重子声波振荡的位置和功率谱形状的支配。我们认为 Alcock-Paczynski 效应的贡献在 $\Lambda$CDM 中是微不足道的，