In single-field inflation, imposing a zero one-point function for the curvature perturbation leaves a finite, scheme-dependent one-loop correction to the two-point function that background renormalization cannot absorb.
Cosmological correlato rs in slow-roll violating inflation,
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Inflationary background renormalization
In single-field inflation, imposing a zero one-point function for the curvature perturbation leaves a finite, scheme-dependent one-loop correction to the two-point function that background renormalization cannot absorb.