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We study the effect of warm dark matter (WDM) on hydrodynamic simulations ofgalaxy formation as part of the Making Galaxies in a Cosmological Context(MaGICC) project. We simulate three different galaxies using three WDMcandidates of 1, 2 and 5 keV and compare results with pure cold dark mattersimulations. WDM slightly reduces star formation and produces less centrallyconcentrated stellar profiles. These effects are most evident for the 1 keVcandidate but almost disappear for $m_{\mathrm{WDM}}>2$ keV. All simulationsform similar stellar discs independent of WDM particle mass. In particular, thedisc scale length does not change when WDM is considered. The reduced amount ofstar formation in the case of 1 keV particles is due to the effects of WDM onmerging satellites which are on average less concentrated and less gas rich.The altered satellites cause a reduced starburst during mergers because theytrigger weaker disc instabilities in the main galaxy. Nevertheless we show thatdisc galaxy evolution is much more sensitive to stellar feedback than it is toWDM candidate mass. Overall we find that WDM, especially when restricted tocurrent observational constraints ($m_{\mathrm{WDM}}>2$ keV), has a minorimpact on disc galaxy formation.

MaGICC-WDM: the effects of warm dark matter in hydrodynamical simulations of disc galaxy formation