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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 BaryonOscillation Spectroscopic Survey (BOSS). These clustering wedges are defined byaveraging the full two-dimensional correlation function, xi(mu,s), over theranges 0<mu<0.5 and 0.5<mu<1, respectively. These measurements allow us toconstrain the parameter combinations D_A(z)/r_s(z_d)=9.03 +- 0.21 andcz/(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 measurementsof CMB, BAO and type Ia supernovae to obtain constraints on the cosmologicalparameters of the standard LCDM model and a number of potential extensions. Theinformation encoded in the clustering wedges is most useful when the darkenergy equation of state is allowed to deviate from its standard LCDM value.The combination of all datasets shows no evidence of a deviation from aconstant 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 potentialdeviations from general relativity by constraining the growth rate f(z)=d lnD(a)/ d ln a, in which case the combination of the CMASS clustering wedges withCMB data implies f(z=0.57)=0.719 +- 0.094, in accordance with the predictionsof GR. Our results clearly illustrate the additional constraining power ofanisotropic clustering measurements with respect to that of angle-averagedquantities.

monthly notices of the royal astronomical society

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