In non-attractor single-field inflation, one-loop corrections to superhorizon gravitational waves cancel, and a Ward identity explains why.
The Inflationary Universe: A Possible Solution to the Horizon and Flatness Problems,
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One-loop corrections to infrared GWs is forbidden by symmetries
In non-attractor single-field inflation, one-loop corrections to superhorizon gravitational waves cancel, and a Ward identity explains why.