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Multifield Reheating and the Fate of the Primordial Observables

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The presence of additional light fields during inflation
can source isocurvature fluctuations, which can cause the curvature
perturbation $\zeta$, and its statistics to evolve on superhorizon scales. I
will demonstrate that if these fluctuations have not completely decayed before
the onset of perturbative reheating, then primordial observables such as the
level of non--Gaussianity can develop substantial reheating dependant
corrections. I will argue that for inflationary models where an adiabatic
condition is not reached before the relevant fields begin to decay, we must be
careful in our interpretation of any observational constraints that place
bounds on the statistics of $\zeta$.