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We study the impact of a warm dark matter (WDM) cosmology on dwarf galaxyformation through a suite of cosmological hydrodynamical zoom-in simulations of$M_{\rm halo} \approx10^{10}\,M_{\odot}$ dark matter halos as part of theFeedback in Realistic Environments (FIRE) project. A main focus of this paperis to evaluate the combined effects of dark matter physics and stellar feedbackon the well-known small-scale issues found in cold dark matter (CDM) models. Wefind that the $z=0$ stellar mass of a galaxy is strongly correlated with thecentral density of its host dark matter halo at the time of formation, $z_{\rmf}$, in both CDM and WDM models. WDM halos follow the same$M_{\star}(z=0)-V_{\rm max}(z_{\rm f})$ relation as in CDM, but they formlater, are less centrally dense, and therefore contain galaxies that are lessmassive than their CDM counterparts. As a result, the impact of baryoniceffects on the central gravitational potential is typically diminished relativeto CDM. However, the combination of delayed formation in WDM and energy inputfrom stellar feedback results in dark matter profiles with lower overalldensities. The WDM galaxies studied here have a wider diversity of starformation histories (SFHs) than the same systems simulated in CDM, and the twolowest $M_{\star}$ WDM galaxies form all of their stars at late times. Thediscovery of young ultra-faint dwarf galaxies with no ancient star formation --which do not exist in our CDM simulations -- would therefore provide evidencein support of WDM.

Warm FIRE: Simulating Galaxy Formation with Resonant Sterile Neutrino Dark Matter