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 {\gt 1) perturbation spectra, motivated both by a composite set of observational data on large scales (CMB anisotropies, bulk flows, etc.), and from the point of view of theoretical model building (e.g. hybrid inflation). In order to put some observational constraints on this type of spectra, both in the frame of purely Cold Dark Matter (CDM) and in Mixed Dark Matter (MDM) scenarios, the authors run N-body simulations and they study the spatial clustering properties and the peculiar velocities. The main results show that a blue MDM model can reproduce the APM-Stromlo variance of count-in-cells and the POTENT bulk flows; on the contraray, a pure CDM model with blue primordial spectrum produces too small-scale power. }