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    Abstract The recent measurement of a cutoff k min in the fluctuation power spectrum P ( k ) of the cosmic microwave background may vitiate the possibility that slow‐roll inflation can simultaneously solve the horizon problem and account for the formation of structure via the growth of quantum fluctuations in the inflaton field. Instead, we show that k min may be interpreted more successfully in the R h = ct cosmology as the first mode exiting from the Planck scale into the semiclassical universe shortly after the Big Bang. In so doing, we demonstrate that such a scenario completely avoids the well‐known trans‐Planckian problem plaguing standard inflationary cosmology.
    Primordial fluctuations
    Semiclassical physics
    Cut-off
    Quantum fluctuation
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