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We study the effect of the Large Magellanic Cloud (LMC) on the dark matter(DM) distribution in the Solar neighborhood, utilizing the Aurigamagneto-hydrodynamical simulations of Milky Way (MW) analogues that have anLMC-like system. We extract the local DM velocity distribution at differenttimes during the orbit of the LMC around the MW in the simulations. As found inprevious idealized simulations of the MW-LMC system, we find that the DMparticles in the Solar neighborhood originating from the LMC analogue dominatethe high speed tail of the local DM speed distribution. Furthermore, the nativeDM particles of the MW in the Solar region are boosted to higher speeds as aresult of a response to the LMC's motion. We simulate the signals expected innear future xenon, germanium, and silicon direct detection experiments,considering DM interactions with target nuclei or electrons. We find that thepresence of the LMC causes a considerable shift in the expected directdetection exclusion limits towards smaller cross sections and DM masses, withthe effect being more prominent for low mass DM. Hence, our study shows, forthe first time, that the LMC's influence on the local DM distribution issignificant even in fully cosmological MW analogues.

The impact of the Large Magellanic Cloud on dark matter direct detection signals