CONFRONTATION OF A DOUBLE INFLATIONARY COSMOLOGICAL MODEL WITH OBSERVATIONS

CDM models with non-scale-free steplike spectra of adiabatic perturbat ions produced in a realistic double inflationary model are compared wi th recent observational data. The model contains two additional free p arameters relatively to the standard CDM model with the flat (n = 1) i nitial spectrum. Results of the COBE experiment are used for the deter mination of a free overall spectrum normalization. Then predictions fo r the galaxy biasing parameter, the variance for ''counts in cell,'' t he galaxy angular correlation function, bulk flow peculiar velocities, and the Mach number test are obtained. Also considered are conditions for galaxy and quasar formation. Observational data strongly restrict allowed values for the two remaining model parameters. However, a non empty region for them satisfying all considered tests is found.