  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 semi-classical 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.
