Relaxing the TCC bound on inflationary cosmology?
Department of Physics, McGill University, Montreal, QC, H3A 2T8, Canada
2 Department of Physics, Bu-Ali Sina (Avicenna) University, Hamedan, 65178, 016016, Iran
3 School of Physics, Insitute for Research in Fundamental Sciences (IPM), Tehran, 19538-33511, Iran
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Accepted: 5 April 2020
Published online: 25 April 2020
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.
© The Author(s), 2020