  The power spectrum of the cosmic microwave background from both the Planck
and WMAP data exhibits a slight dip in for multipoles in the range of l=10-30.
We show that such a dip could be the result of resonant creation of a massive
particle that couples to the inflaton field. For our best-fit models, epochs of
resonant particle creation reenters the horizon at wave numbers of k* ~ 0.00011
(h/Mpc). The amplitude and location of these features correspond to the
creation of a number of degenerate fermion species of mass ~ 15 times the
planck mass during inflation with a coupling constant between the inflaton
field and the created fermion species of near unity. Although the evidence is
marginal, if this interpretation is correct, this could be one of the first
observational hints of new physics at the Planck scale.
