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We investigate the cosmic evolution of the internal structure of massiveearly-type galaxies over half of the age of the Universe. We perform a jointlensing and stellar dynamics analysis of a sample of 81 strong lenses from theSL2S and SLACS surveys and combine the results with a hierarchical Bayesianinference method to measure the distribution of dark matter mass and stellarIMF across the population of massive early-type galaxies. Lensing selectioneffects are taken into account. We find that the dark matter mass projectedwithin the inner 5 kpc increases for increasing redshift, decreases forincreasing stellar mass density, but is roughly constant along the evolutionarytracks of early-type galaxies. The average dark matter slope is consistent withthat of an NFW profile, but is not well constrained. The stellar IMFnormalization is close to a Salpeter IMF at $\log{M_*} = 11.5$ and scalesstrongly with increasing stellar mass. No dependence of the IMF on redshift orstellar mass density is detected. The anti-correlation between dark matter massand stellar mass density supports the idea of mergers being more frequent inmore massive dark matter halos.

The SL2S Galaxy-scale Lens Sample. V. Dark Matter Halos and Stellar IMF of Massive Early-type Galaxies out to Redshift 0.8