https://doi.org/10.1140/epjc/s10052-020-7908-8
Letter
Relaxing the TCC bound on inflationary cosmology?
1
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
* e-mail: rhb@physics.mcgill.ca
Received:
6
February
2020
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
