An Effective Cosmological Collider

Abstract

Effective field theories (EFTs) of heavy particles coupled to the inflaton are rife with operator redundancies, frequently obscured by sensitivity to both boundary terms and field redefinitions. We initiate a systematic study of these redundancies by establishing a minimal operator basis for an archetypal example, the abelian gauge-Higgs-inflaton EFT. Working up to dimension 9, we show that certain low-dimensional operators are entirely redundant and identify new non-redundant operators with potentially interesting cosmological collider signals. Our methods generalize straightforwardly to other EFTs of heavy particles coupled to the inflaton.

arXiv comment31 pages, 4 figures

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• The Massive Flat Space Limit of Cosmological Correlators
• Fingerprints of a Non-Inflationary Universe from Massive Fields
• The cosmological collider in $R^2$ inflation
• Non-relativistic Cosmological Collider Signals