  A generic outcome of theories with scalar-tensor coupling is the existence of
inflationary attractors, either power-law or de Sitter. The fluctuations
arising during this phase are Gaussian and their spectrum depends on the
wavenumber $k$ according to the power-law $k^{1/(1-p)}$, where $p$ is the
inflationary power-law exponent. We investigate to which extent these
properties depend on the coupling function and on the potential. We find the
class of models in which viable attractors exist. Within this class, we find
that the cosmic expansion and the scaling of the fluctuation spectrum are
independent of the coupling function. Further, the analytical solution of the
Fokker-Planck equation shows that the deviations from Gaussianity are
negligible.

General Relativity and Quantum Cosmology;Astrophysics