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We present the Dark MaGICC project, which aims to investigate the effect ofDark Energy (DE) modeling on galaxy formation via hydrodynamical cosmologicalsimulations. Dark MaGICC includes four dynamical Dark Energy scenarios withtime varying equations of state, one with a self-interacting Ratra-Peeblesmodel. In each scenario we simulate three galaxies with high resolution usingsmoothed particle hydrodynamics (SPH). The baryonic physics model is the sameused in the Making Galaxies in a Cosmological Context (MaGICC) project, and wevaried only the background cosmology. We find that the Dark Energyparameterization has a surprisingly important impact on galaxy evolution and onstructural properties of galaxies at z=0, in striking contrast with predictionsfrom pure Nbody simulations. The different background evolutions can (dependingon the behavior of the DE equation of state) either enhance or quench starformation with respect to a LCDM model, at a level similar to the variation ofthe stellar feedback parameterization, with strong effects on the final galaxyrotation curves. While overall stellar feedback is still the driving force inshaping galaxies, we show that the effect of the Dark Energy parameterizationplays a larger role than previously thought, especially at lower redshifts. Forthis reason, the influence of Dark Energy parametrization on galaxy formationmust be taken into account, especially in the era of precision cosmology.

Dark MaGICC: the effect of Dark Energy on galaxy formation. Cosmology does matter