  Primordial non-Gaussianity signatures of extremely heavy particles are
re-examined within a simple alternative to the standard inflationary paradigm,
in which the primordial fluctuations and the inflationary spacetime expansion
are sourced by two different fields. The curvaton scenario provides an example
of this in which the distinct roles are played by the curvaton and the inflaton
fields, respectively. We study couplings of the curvaton to heavy particles
with masses of order the inflationary Hubble scale, and show that they can lead
to non-Gaussian signals orders of magnitude larger than those in standard
inflation, consistent with explicit effective field theory control of
inflationary dynamics. This brings various motivated particle physics
signatures, such as loops of heavy gauge-charged scalars and fermions, within
future observational reach.
