Inflation and reheating in scale-invariant scalar-tensor gravity
  We consider the scale-invariant inflationary model studied in [1]. The
Lagrangian includes all the scale-invariant operators that can be built with
combinations of $R$, $R^2$ and one scalar field. The equations of motion show
that the symmetry is spontaneously broken after an arbitrarily long
inflationary period and a fundamental mass scale is generated. Upon symmetry
breaking, and in the Jordan frame, both Hubble function and the scalar field
undergo damped oscillations that can eventually amplify Standard Model fields
and reheat the Universe. In the present work, we study in detail inflation and
the reheating mechanism of this model in the Einstein frame and we compare some
of the results with the latest observational data.
