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We study the cosmological evolution of baryons in universes with and withoutprimordial non-Gaussianities via (large scale) N-body/hydrodynamicalsimulations, including gas cooling, star formation, stellar evolution, chemicalenrichment from both population III and population II regimes, and feedbackeffects. We find that large fnl values for non-Gaussianities can alter the gasprobability distribution functions, the metal pollution history, the halobaryon, gas and stellar fractions, mostly at early times. More precisely: (i)non-Gaussianities lead to an earlier evolution of primordial gas, structures,and star formation; (ii) metal enrichment starts earlier (with respect to theGaussian scenario) in non-Gaussian models with larger fnl; (iii) gas fractionswithin the haloes are not significantly affected by the different values offnl, with deviations of ~1-10%; (iv) the stellar fraction is quite sensitive tonon-Gaussianities at early times, with discrepancies reaching up to a factor of~10 at very high z, and rapidly converging at low z; (v) the trends at lowredshift are independent from fnl: they are mostly led by the ongoing baryonicevolution and by the feedback mechanisms, which determine a ~25%-30%discrepancy in the baryon fraction of galaxy groups/clusters with respect tothe cosmic values; (vi) non-Gaussianity impacts on the cluster X-ray emissionor on the SZ effect(s) are expected to be not very large and dominated byfeedback mechanisms, whereas some effects on the 21-cm emission can be expectedat early times; (vii) in order to address non-Gaussianities in the cosmologicalstructure contest, high-redshift (z~10) investigations are required: firststars, galaxies, quasars, and GRBs may be potential cosmological probes ofnon-Gaussianities.

Gas distribution, metal enrichment, and baryon fraction in Gaussian and non-Gaussian universes