(When) Do Inflationary Perturbations Classicalize?

Primordial fluctuations need not lose their quantum character as quickly as commonly assumed. Using inflationary effective theory beyond slow roll, this talk constructs Wigner functions whose negative interference fringes diagnose nonclassical behaviour. Those features can strengthen outside the horizon, and in some motivated regimes their creation outpaces environmental decoherence. The resulting phase-space structure suggests cosmological observables that might retain evidence of the fluctuations' quantum origins.