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The authors study the signature of heavy spectator fields (``cosmological collider signal'') that couple to the inflaton for the case of large-field inflation with order M₋₀₍₊ excursion of the inflaton. Motivated by the so-called swampland distance conjecture, they consider exponentially time-dependent masses and show that the resulting scale dependence of the bispectrum can be an informative probe for general properties of different classes of inflation.
Reece et al. (Tue,) studied this question.
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