## “School of Physics”

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Paper   IPM / P / 16097
School of Physics
Title:   Relaxing the TCC bound on inflationary cosmology?
Author(s):
 1 V. Kamali 2 R. Brandenberger
Status:   Published
Journal: Eur. Phys. J. C
Vol.:  80
Year:  2020
Pages:   339
Supported by:  IPM
Abstract:
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 â after an initial period of slow rolling when scales probed today in CMB experiments exit the Hubble radius â 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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