Relaxing the TCC Bound on Inflationary Cosmology?

Understand

We demonstrate that the strict upper bounds on the energy scale of inflation and on the tensor-to-scalar ratio can be somewhat relaxed if we assume that - after an initial period of slow rolling when scales probed today in CMB experiments exit the Hubble radius - the equation of state of the background changes to correspond to an almost marginally accelerating universe.

• Constructing an actual model in which this happens appears, however, to be unnatural.