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The structure and dynamics of dark matter halos, as predicted by thehierarchical clustering scenario, are at odds with the properties inferred fromthe observations at galactic scales. My Thesis addresses this problem by takingan evolutionary approach. I analysed in detail the many and differentobservational evidences of a discrepancy the predicted halo equilibrium stateand the one inferred from the measurable properties of disk galaxies, as wellas of the scaling relations existing between the angular momentum, geometry andmass distribution of the luminous and dark components, and realized that theyall seem to point towards the same conclusion: the baryons hosted inside thehalo, by collapsing and assembling to form the galaxy, perturb the haloequilibrium structure and made it evolve into new configurations. From thetheoretical point of view, the behaviour of dark matter halos as collisionlesssystems of particles makes their equilibrium structure and mass distributionextremely sensitive to perturbations of their inner dynamics. The galaxyformation occurring inside the halos is a tremendous event, and the dynamicalcoupling between the baryons and the dark matter during the protogalaxycollapse represents a perturbation of the halo dynamical structure large enoughto trigger a halo evolution, according to the relative mass and angularmomentum of the two components. My conclusion is that the structure anddynamics of dark matter halos, as well as the origin of the connection betweenthe halo and galaxy properties, are to be understood in in terms of a jointevolution of the baryonic and dark components, originating at the epoch of thecollapse and formation of the galaxy.

The role of galaxy formation in the structure and dynamics of dark matter halos