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Dark matter-only simulations are able to produce the cosmic structure of a$\Lambda$CDM universe, at a much lower computational cost than more physicallymotivated hydrodynamical simulations. However, it is not clear how well smallersubstructure is reproduced by dark matter-only simulations. To investigatethis, we directly compare the substructure of galaxy clusters and ofsurrounding galaxy groups in hydrodynamical and dark matter-only simulations.We utilise TheThreeHundred project, a suite of 324 simulations of galaxyclusters that have been simulated with hydrodynamics, and in dark matter-only.We find that dark matter-only simulations underestimate the number density ofgalaxies in the centres of groups and clusters relative to hydrodynamicalsimulations, and that this effect is stronger in denser regions. We also lookat the phase space of infalling galaxy groups, to show that dark matter-onlysimulations underpredict the number density of galaxies in the centres of thesegroups by about a factor of four. This implies that the structure and evolutionof infalling groups may be different to that predicted by dark matter-onlysimulations. Finally, we discuss potential causes for this underestimation,considering both physical effects, and numerical differences in the analysis.

The Three Hundred Project: Substructure in hydrodynamical and dark matter simulations of galaxy groups around clusters