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Exact numerical primordial primordial power spectra are computed and plotted for the best-fit Planck 2018 curved universe parameters. It is found that the spectra have generic cutoffs and oscillations within the observable window for the level of curvature allowed by current cosmic microwave background measurements and provide a better fit to current data. Derivations for the Mukhanov-Sasaki equation for curved universes are presented and analyzed, and theoretical implications for the quantum and classical initial conditions for inflation are discussed within the curved regime.
Will Handley (Thu,) studied this question.
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