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We study the evolution of the luminosity-to-halo mass relation of LuminousRed Galaxies (LRGs). We select a sample of 52 000 LOWZ and CMASS LRGs from theBaryon Oscillation Spectroscopic Survey (BOSS) SDSS-DR10 in the ~450 deg^2 thatoverlaps with imaging data from the second Red-sequence Cluster Survey (RCS2),group them into bins of absolute magnitude and redshift and measure their weaklensing signals. The source redshift distribution has a median of 0.7, whichallows us to study the lensing signal as a function of lens redshift. Weinterpret the lensing signal using a halo model, from which we obtain the halomasses as well as the normalisations of the mass-concentration relations. Wefind that the concentration of haloes that host LRGs is consistent with darkmatter only simulations once we allow for miscentering or satellites in themodelling. The slope of the luminosity-to-halo mass relation has a typicalvalue of 1.4 and does not change with redshift, but we do find evidence for achange in amplitude: the average halo mass of LOWZ galaxies increases by25_{-14}^{+16} % between z=0.36 and 0.22 to an average value of 6.43+/-0.52 x10^13 h70^-1 Msun. If we extend the redshift range using the CMASS galaxies andassume that they are the progenitors of the LOWZ sample, we find that theaverage mass of LRGs increases by 80^{+39}_{-28} % between z=0.6 and 0.2

Evolution of the luminosity-to-halo mass relation of LRGs from a combined SDSS-DR10+RCS2 analysis