Are the universe's quantum signals just flat-space physics in disguise?

Calculations of quantum correlations across the universe (in curved de Sitter space) are notoriously harder than in flat spacetime. By dressing flat-space amplitudes with auxiliary propagators, this work derives cutting rules, recursion relations, and soft-particle limits for curved-space correlators directly from their flat-space counterparts — including hints of a universal structure in subleading soft limits. If the pattern holds, it suggests the mathematical skeleton of cosmological observables is fundamentally flat-space physics wearing a curved-space coat.