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Title: Dark matter substructure as a probe of dark matter microphysics

Abstract: The nature of dark matter on the scales of galaxies and clusters remains uncertain. Several alternatives to the cold dark matter paradigm remain theoretically motivated such as Ultralight dark matter, warm dark matter, and self-interacting dark matter. In this talk I first review how the detailed properties of dark matter subhalos are sensitive to the underlying particle physics. I then discuss astrophysical probes that can distinguish between these different subhalo populations. After that, I discuss recent progress in modeling the astrophysical signatures of self-interacting dark matter and the exciting prospects for upcoming surveys such as the Rubin LSST, Euclid, and S5.