MICROWAVE BACKGROUND TEMPERATURE-FLUCTUATIONS RESULTING FROM NONFLAT PERTURBATION SPECTRA

Recent observations indicate extra power in the primordial perturbatio n spectrum at large scales. Nonflat spectra of adiabatic perturbations generated in a realistic double inflationary model are used to calcul ate the fluctuations of the microwave background radiation at large, i ntermediate and small angles. At large angles the predicted temperatur e fluctuations are in accordance with those predicted by a flat pertur bation spectrum. Deviations occur at intermediate and at small angles, Normalizing the calculated temperature fluctuations by the observed C OBE quadrupole one can deliver predictions for different small angle e xperiments. Predictions about the place and the height of a step in th e perturbation spectrum could be made from two positive experiments on different small or intermediate angular scales