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We compare the predictions of three independently developed semi-analyticgalaxy formation models that are being used to aid in the interpretation ofresults from the CANDELS survey. These models are each applied to the same setof halo merger trees extracted from the "Bolshoi" simulation and are carefullytuned to match the local galaxy stellar mass function using the powerful methodof Bayesian Inference coupled with MCMC or by hand. The comparisons reveal thatin spite of the significantly different parameterizations for star formationand feedback processes, the three models yield qualitatively similarpredictions for the assembly histories of galaxy stellar mass and starformation over cosmic time. We show that the SAMs generally require strongoutflows to suppress star formation in low-mass halos to match the present daystellar mass function. However, all of the models considered producepredictions for the star formation rates and metallicities of low-mass galaxiesthat are inconsistent with existing data and diverge between the models. Wesuggest that large differences in the metallicity relations and smalldifferences in the stellar mass assembly histories of model galaxies stem fromdifferent assumptions for the outflow mass-loading factor. Importantly, whilemore accurate observational measurements for stellar mass, SFR and metallicityof galaxies at 1<z<5 will discriminate between models, the discrepanciesbetween the models and existing data of these observables have already revealedchallenging problems in understanding star formation and its feedback in galaxyformation. The three sets of models are being used to construct catalogs ofmock galaxies on light cones that have the same geometry as the CANDELS survey,which should be particularly useful for quantifying the biases anduncertainties on measurements and inferences from the real observations.-ABRIDGED

A Comparison between Semi-Analytic Model Predictions for the CANDELS Survey