Non-scale-invariant density perturbations from chaotic extended inflation

MOLLERACH, SILVIA; MATARRESE, SABINO

PHYSICAL REVIEW D - PARTICLE AND FILDS

American Physical Society

Año: 1992 vol. 45 p. 1961 - 1970

0556-2821

Chaotic inflation is analyzed in the frame of scalar-tensor theories of gravity. Fluctuations in the energy density arise from quantum fluctuations of the Brans-Dicke field and of the inflaton field. The spectrum of perturbations is studied for a class of models: it is non-scale-invariant and, for certain values of the parameters, it has a peak. If the peak appears at astrophysically interesting scales it may help to reconcile the cold-dark-matter scenario for structure formation with large-scale observations.