Commonly hot dark matter (HDM) models of the universe are not considered able to obtain actual large scale structure (LSS), principally because of two problems: the free streaming, that is the responsible of the HDM structures vanishing when their mass is lower than the Jean's mass; and -once resolved the previous problem- the continuity of the process of Jeans' fragmentation, that is unable to settle privilegiate dimensions like are the superclusters of galaxies, the clusters of galaxies and the galaxies. We show a possible solution of both those problems that comes out from the study of damping time in massive fermions collapsing structures. We make a comparison of our HDM cellular fractal model of the universe with some observational data. The consequences on the Hubble law are taken into account.
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