This thesis has been motivated by the necessity of studying the impact on the large scale structure of the universe by a dominant (warm dark matter), or subdominant (relic neutrinos) non-cold component of the dark matter. On one side, we have given an answer to the question whether warm dark matter can solve or alleviate the cusp/core problem, and on the other side, by studying the impact of relic neutrinos on non-lineal structures such as galaxy clusters or cosmological voids, we have searched for new cosmological observables that would be sensitive to the masses of the neutrinos.
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