We examine the nature of loop corrections during inflation, distinguishing between trivial contributions –removable by counterterms– and non-trivial ones that yield genuinely new physical effects. We identify the essential ingredients required for non-trivial loop corrections to tree-level observables and illustrate them in a simple and explicit scenario within the framework of the EFT of Inflation. We introduce a streamlined method for evaluating loop integrals using dimensional regularization, which facilitates the extraction of the UV contributions. We discuss issues encountered in the renormalization of observables in the in-in formalism.

 

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