Inflation from scale-invariant gravity

Abstract: Motivated by the search for inflationary models with a non-negligible tensor-to-scalar ratio, we discuss scale-invariant quadratic gravity with loop quantum corrections. This model is fundamentally distinct from the Starobinsky one and  yields precise observational signatures. As we will show, the spectral index and the tensor-to-scalar ratio do not depend on the parameters of the theory but just on the number of efolds. In particular, we find that r ~ 0.07.