Dark matters on the scale of galaxies

Understand

The cold dark matter model successfully explains both the emergence and evolution of cosmic structures on large scales and, when we include a cosmological constant, the properties of the homogeneous and isotropic Universe.

• However, the cold dark matter model faces persistent challenges on the scales of galaxies.
• {Indeed,} N-body simulations predict some galaxy properties that are at odds with the observations.
• These discrepancies are primarily related to the dark matter distribution in the innermost regions of the halos of galaxies and to the dynamical properties of dwarf galaxies.