Large Scale Matter Distribution

The observed redshift distribution of Ly-α lines and metal systems is examined in order to discriminate and to trace the evolution of structure elements observed in the galaxy distribution, at small redshifts, and to test the theoretical description of structure evolution. We show that the expected evolution of filamentary component of structure describes quite well the redshift distribution of metal systems and stronger Ly-α lines with log(N_HI) ≥14, at z ≤ 3. The redshift distribution of weaker Ly-α lines can be attributed to the population of poorer structure elements, which were formed at high redshifts from the invisible DM and non luminous baryonic matter, and at lower redshifts they mainly merged and dispersed. The observed characteristics of neutral hydrogen are related to entropy of the gaseous fraction and they trace the evolutionary history of absorbers. The observed characteristics of Doppler parameter can be related to the size and DM column density of structure elements. The distribution of Doppler parameter is consistent with the Gaussian initial perturbations.