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We present the new semi-analytic model of galaxy evolution, DARK SAGE, aheavily modified version of the publicly available SAGE code. The model isdesigned for detailed evolution of galactic discs. We evolve discs in a seriesof annuli with fixed specific angular momentum, which allows us to makepredictions for the radial and angular-momentum structure of galaxies. Mostphysical processes, including all channels of star formation and associatedfeedback, are performed in these annuli. We present the surface densityprofiles of our model spiral galaxies, both as a function of radius andspecific angular momentum, and find the discs naturally build apseduobulge-like component. Our main results are focussed on predictionsrelating to the integrated mass--specific angular momentum relation of stellardiscs. The model produces a distinct sequence between these properties inremarkable agreement with recent observational literature. We investigate theimpact Toomre disc instabilities have on shaping this sequence and find theyare crucial for regulating both the mass and spin of discs. Withoutinstabilities, high-mass discs would be systematically deficient in specificangular momentum by a factor of ~2.5, with increased scatter. Instabilitiesalso appear to drive the direction in which the mass--spin sequence of spiralgalaxy discs evolves. With them, we find galaxies of fixed mass have higherspecific angular momentum at later epochs.

Building disc structure and galaxy properties through angular momentum: The DARK SAGE semi-analytic model