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We present a clustering analysis of Luminous Red Galaxies in SDSS Stripe 82.We study the angular 2-point correlation function, of 130,000 LRG candidatesvia colour-cut selections in izK with the K band coverage coming from UKIDSSLAS. We have used the cross-correlation technique of Newman (2008) to establishthe LRG redshift distribution. Cross-correlating with SDSS QSOs, MegaZ-LRGs andDEEP2 galaxies implies an average LRG redshift of z~1 with space density,n_g~3.2 +/-0.16 x10^-4 h^3 Mpc^-3. For theta<10', w(theta) significantlydeviates from a single power-law. A double power-law with a break at r_b~2.4h^-1 Mpc fits the data better, with best-fit scale length, r_0,1=7.63+/-0.27h^-1Mpc and slope gamma_1=2.01 +/-0.02 at small scales and r_0,2=9.92 +/-0.40h^-1 Mpc and gamma_2=1.64 +/-0.04 at large scales. Due to the flat slope atlarge scales, we find that a standard LambdaCDM linear model is accepted onlyat 2-3sigma, with the best-fit bias factor, b=2.74+/-0.07. We also fitted HODmodels and estimate an effective halo mass of M_eff=3.3 +/-0.6x10^13 h^-1M_sun. But at large scales, the current HOD models did not help explain thepower excess in the clustering signal. We then compare the w(theta) results tothose of Sawangwit et al. (2011) from 3 samples of LRGs at lower redshifts tomeasure clustering evolution. We find that a long-lived model may be a poorerfit than at lower redshifts, although this assumes that the Stripe 82 LRGs areluminosity-matched to the AAOmega LRGs. We find stronger evidence for evolutionin the form of the z~1 LRG correlation function, with the above flat 2-haloslope maintaining to r>50 h^-1 Mpc. Applying the cross-correlation test of Rosset al. (2011), we find little evidence that the result is due to systematics.Otherwise it may provide evidence for primordial non-Gaussianity in the matterdistribution, with f^local_NL=90+/-30.[Abridged]

Clustering analysis of high-redshift Luminous Red Galaxies in Stripe 82