![]() ![]() This coarse-grained description of a CDM is very successful in fitting the linear, large-scales observations from the CMB, LSS, to clusters, and general properties of galaxies. ![]() In the CDM model, DM is described by a perfect fluid that must be massive, sufficiently cold, which means non-relativistic at the time of structure formation, and collisionless to explain the observational data on large linear scales. ![]() Therefore, within \(\varLambda \)CDM, the Cold Dark Matter (CDM) paradigm emerged from the large-scale observations and describes the component responsible for the formation of the structures of our universe through gravitational clustering. Dark energy is parametrized by a cosmological constant, the simplest model for the present accelerated expansion of our universe. Ultra-light dark matter is a class of dark matter models (DM), where DM is composed by bosons with masses ranging from \(10^ \approx 0\), that does not interact, at least strongly, with baryonic matter. ![]()
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