Linear inflation from quartic potential
  We show that if the inflaton has a non-minimal coupling to gravity and the
Planck scale is dynamically generated, the results of Coleman-Weinberg
inflation are confined in between two attractor solutions: quadratic inflation,
which is ruled out by the recent measurements, and linear inflation which,
instead, is in the experimental allowed region. The minimal scenario has only
one free parameter -- the inflaton's non-minimal coupling to gravity -- that
determines all physical parameters such as the tensor-to-scalar ratio and the
reheating temperature of the Universe. Should the more precise future
measurements of inflationary parameters point towards linear inflation, further
interest in scale-invariant scenarios would be motivated.
