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The impacts of Compton scattering of hot cosmic gas with the cosmic microwavebackground radiation (Sunyaev-Zel'dovich effect, SZ) are consistentlyquantified in Gaussian and non-Gaussian scenarios, by means of 3D numerical,N-body, hydrodynamic simulations, including cooling, star formation, stellarevolution and metal pollution (He, C, O, Si, Fe, S, Mg, etc.) from differentstellar phases, according to proper yields for individual metal species andmass-dependent stellar lifetimes. Light cones are built through the simulationoutputs and samples of one hundred maps for the resulting temperaturefluctuations are derived for both Gaussian and non-Gaussian primordialperturbations. From them, we estimate the possible changes due to earlynon-Gaussianities on: SZ maps, probability distribution functions, angularpower spectra and corresponding bispectra. We find that the different growth ofstructures in the different cases induces significant spectral distortions onlyin models with large non-Gaussian parameters, $f_{\rm NL}$. In general, theoverall trends are covered by the non-linear, baryonic evolution, whosefeedback mechanisms tend to randomize the gas behaviour and homogenize itsstatistical features, quite independently from the background matterdistribution. Deviations due to non-Gaussianity are almost undistinguishablefor $f_{\rm NL}\lesssim 100$, remaining always at few-per-cent level, withinthe error bars of the Gaussian scenario. Rather extreme models with $f_{\rmNL}\sim1000$ present more substantial deviations from the Gaussian case,overcoming baryon contaminations and showing discrepancies up to a factor of afew in the spectral properties.

Hydrodynamical chemistry simulations of the SZ effect and the impacts from primordial non-Gaussianities