“School of Physic”
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| Paper IPM / Physic / 16097 |
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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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