The Zeta-Zeta Correlator Is Time Dependent
  We comment on the recent arguments by Senatore and Zaldarriaga that loop
corrections to the zeta-zeta correlator cannot grow with time after first
horizon crossing. We first emphasize the need to search for such secular
dependence in corrections whose in-out matrix elements are infrared singular on
an infinite spatial manifold. Then we give examples of such time dependence
from pure quantum gravity and from scalar potential models. Finally, we point
out that this time dependence arises from inflationary particle production and
is therefore unlikely to endanger the preservation of super-horizon
correlations as a record of inflation.
