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arXiv 1303.4396astro-ph.CO
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SDSS-III重子振荡光谱巡天中的星系成团:来自成团楔完整形状的宇宙学约束

The clustering of galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: cosmological constraints from the full shape of the clustering wedges

Ariel G. Sanchez, Eyal A. Kazin, Florian Beutler, Chia-Hsun Chuang, Antonio J. Cuesta, Daniel J. Eisenstein, Marc Manera, Francesco Montesano, Bob Nichol, Nikhi… 展开作者

Ariel G. Sanchez, Eyal A. Kazin, Florian Beutler, Chia-Hsun Chuang, Antonio J. Cuesta, Daniel J. Eisenstein, Marc Manera, Francesco Montesano, Bob Nichol, Nikhil Padmanabhan, Will Percival, Francisco Prada, Ashley J. Ross, David J. Schlegel, Jeremy Tinker, Rita Tojeiro, David H. Weinberg, Xiaoying Xu, J. Brinkmann, Joel R. Brownstein, Donald P. Schneider, Daniel Thomas

摘要:

本文探讨了重子振荡谱巡天(BOSS)CMASS数据发布9(DR9)样本中的成团楔xi_perp(s)和xi_para(s)的宇宙学意义。通过分别在0 <mu <0.5和0.5 <mu <1的范围内对全二维关联函数xi(mu,s)求平均来定义这些聚类楔形。这些测量使我们能够在样品的平均redsfhit z = 0.57处约束参数组合D_A(z)/r_s(z_d)= 9.03 +-0.21和cz/(r_s(z_d)H(z))= 12.14 +-0.43。我们结合最近的测量CMB,BAO和Ia型超新星的集群楔的信息,以获得对标准LCDM模型和一些潜在的扩展的宇宙学参数的约束。当允许暗能量状态方程偏离其标准LCDM值时,编码在聚类楔中的信息是最有用的。所有数据集的组合没有显示出偏离恒定暗能量状态方程的证据,在这种情况下,我们发现w_DE =-1.013 +-0.064,与宇宙学常数完全一致。我们通过限制增长率f(z)= d ln D(a)/d ln a来探索与广义相对论的潜在偏差,在这种情况下,CMASS聚类楔与CMB数据的组合意味着f(z = 0.57)= 0.719 ± 0.094,根据GR的预测。我们的结果清楚地说明了各向异性聚类测量相对于角度的额外约束能力-平均数量。

英文摘要:

We explore the cosmological implications of the clustering wedges, xi_perp(s) and xi_para(s), of the CMASS Data Release 9 (DR9) sample of the Baryon Oscillation Spectroscopic Survey (BOSS). These clustering wedges are defined by averaging the full two-dimensional correlation function, xi(mu,s), over the ranges 0<mu<0.5 and 0.5<mu<1, respectively. These measurements allow us to constrain the parameter combinations D_A(z)/r_s(z_d)=9.03 +- 0.21 and cz/(r_s(z_d)H(z)) = 12.14 +- 0.43 at the mean redsfhit of the sample, z=0.57. We combine the information from the clustering wedges with recent measurements of CMB, BAO and type Ia supernovae to obtain constraints on the cosmological parameters of the standard LCDM model and a number of potential extensions. The information encoded in the clustering wedges is most useful when the dark energy equation of state is allowed to deviate from its standard LCDM value. The combination of all datasets shows no evidence of a deviation from a constant dark energy equation of state, in which case we find w_DE = -1.013 +- 0.064, in complete agreement with a cosmological constant. We explore potential deviations from general relativity by constraining the growth rate f(z)=d ln D(a)/ d ln a, in which case the combination of the CMASS clustering wedges with CMB data implies f(z=0.57)=0.719 +- 0.094, in accordance with the predictions of GR. Our results clearly illustrate the additional constraining power of anisotropic clustering measurements with respect to that of angle-averaged quantities.

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