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We present results on the clustering of 282,068 galaxies in the BaryonOscillation Spectroscopic Survey (BOSS) sample of massive galaxies withredshifts 0.4<z<0.7 which is part of the Sloan Digital Sky Survey III project.Our results cover a large range of scales from ~0.5 to ~90 Mpc/h. We comparethese estimates with the expectations of the flat LCDM cosmological model withparameters compatible with WMAP7 data. We use the MultiDark cosmologicalsimulation together with a simple halo abundance matching technique, toestimate galaxy correlation functions, power spectra, abundance of subhaloesand galaxy biases. We find that the LCDM model gives a reasonable descriptionto the observed correlation functions at z~0.5, which is a remarkably goodagreement considering that the model, once matched to the observed abundance ofBOSS galaxies, does not have any free parameters. However, we find a deviation(>~10%) in the correlation functions for scales less than ~1 Mpc/h and ~10-40Mpc/h. A more realistic abundance matching model and better statistics fromupcoming observations are needed to clarify the situation. We also estimatethat about 12% of the "galaxies" in the abundance-matched sample are satellitesinhabiting central haloes with mass M>~1e14 M_sun/h. Using the MultiDarksimulation we also study the real space halo bias b(r) of the matched cataloguefinding that b=2.00+/-0.07 at large scales, consistent with the one obtainedusing the measured BOSS projected correlation function. Furthermore, the linearlarge-scale bias depends on the number density n of the abundance-matchedsample as b=-0.048-(0.594+/-0.02)*log(n/(h/Mpc)^3). Extrapolating these resultsto BAO scales we measure a scale-dependent damping of the acoustic signalproduced by non-linear evolution that leads to ~2-4% dips at ~3 sigma level forwavenumbers k>~0.1 h/Mpc in the linear large-scale bias.

The clustering of galaxies at z~0.5 in the SDSS-III Data Release 9 BOSS-CMASS sample: a test for the LCDM cosmology