  In the previous work, a new kind of inflation model was proposed, which has
the interesting property that its perturbation equation of motion gets a
correction of k^4, due to the non-linearity of the kinetic term. Nonetheless,
the scale-invariance of the power spectrum remains valid, both in large-k and
small-k limits. In this paper, we investigate in detail the spectral index, the
index running and the tensor/scalar ratio in this model, especially on the
potential-driven case, and compare the results to the current PLANCK/BICEP
observational data. We also discuss the tensor spectrum in this case, which is
expected to be tested by the future observations on primordial gravitational
waves.
