We extend semiclassical methods in inflationary cosmology that capture leading IR corrections to correlators.
Such large IR effects can be absorbed into a coordinate change when examining sufficiently local observables, but not when comparing observations at large separation in scales, such as seen by a late-time observer.
The analysis is facilitated by definition of a scale-dependent metric and physical momentum.
These assist definition of "IR-safe" observables seen by a post-inflationary observer, which are contrasted to those based on the local geometry of the reheating surface.
Cosmological observables, IR growth of fluctuations, and scale-dependent anisotropies · Around
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