N-BODY SIMULATIONS OF THE LARGE-SCALE STRUCTURE OF THE UNIVERSE IN MODELS WITH BLUE PRIMORDIAL PERTURBATION SPECTRA

Recently, there has been growing interest on primordial 'blue' (n >1) perturbation spectra, motivated both by a composite set of observation al data on large scales (CMB anisotropies, bulk flows, etc.), and from the point of view of theoretical model building (e.g. hybrid inflatio n). In order to put some observational constraints on this type of spe ctra, both in the frame of purely Cold Dark Matter (CDM) and in Mixed Dark Matter (MDM) scenarios, we run N-body simulations and we study th e spatial clustering properties and the peculiar velocities. The main results show that a blue MDM model can reproduce the APM-Stromlo varia nce of counts-in-cells and the POTENT bulk flows; on the contrary, a p ure CDM model with blue primordial spectrum produces too small-scale p ower.