Zoomed high-resolution simulations of Multi-coupled Dark Energy: cored
  galaxy density profiles at high redshift
  We perform for the first time high-resolution zoom-in re-simulations of
individual halos in the context of the Multi-coupled Dark Energy (McDE)
scenario, which is characterised by the existence of two distinct dark matter
particle species with opposite couplings to a Dark Energy scalar field. We
compare the structural properties of the simulated halos to the standard
Lambda-CDM results. The zoomed-in initial conditions are set up using a
specifically designed code called ZInCo that we publicly release along with the
present paper. Our numerical results allow to investigate in detail and with
unprecedented resolution the halo segregation process that characterises McDE
cosmologies from its very early stages. In particular, we find that in contrast
to what could be inferred from previous numerical analysis at lower resolution,
the segregation process is already in place at redshifts as high as z ~ 7. Most
remarkably, we find that the subsequent evolution of the segregation leads to
the formation of cored total matter density profiles with a core size that
progressively increases in time. The shape of the cored profiles can be
accurately predicted as the superposition of two NFW profiles with an
increasing offset, thereby confirming the interpretation of the simulations
results in terms of the segregation of the two dark matter components of the
halo as a consequence of their different coupling to the Dark Energy field.
