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Based on a set of cosmological N‐body simulations we analyze properties of the dark matter (DM) haloes in a galaxy mass range (10 11 –10 13  h ‐1 M odot ) in modified ΛCDM cosmology with additional dynamically screened scalar interactions in DM sector. Our simulations show that scalar interactions support picture of the Island Universe. Rapid structure formation processes are shifted into higher redshifts resulting in a much smaller accretion and merging rates for galactic haloes at low redshifts. Finally, we present how this “fifth” force affects halo properties, like density profile, triaxiality, ellipticities and the spin parameter.

Galactic halos in cosmology with long‐range scalar DM interaction