  We study the impacts of reheating temperature on the inflationary predictions
of the spectral index and tensor-to-scalar ratio. Assuming sinusoidal
oscillations and that reheating process is very fast, the reheating temperature
can be constrained for sinusoidal oscillation within a factor of 10 - 100 or
even better with the prospect of future observations. Beyond this, we find that
the predictions can also be insensitive to the reheating temperature in certain
models, including Higgs inflation.
