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Paper   IPM / Physic / 16097
School of Physics
  Title:   Relaxing the TCC bound on inflationary cosmology?
1.  V. Kamali
2.  R. Brandenberger
  Status:   Published
  Journal: Eur. Phys. J. C
  Vol.:  80
  Year:  2020
  Pages:   339
  Supported by:  IPM
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.

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