Built on

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Then

A. Kehagias, A. M. Dizgah, and A. Riotto, Remarks on the Starobinsky model of inflation and its descendants
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2014
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R. Emami, Spectroscopy of Masses and Couplings during Inflation
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2014
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A. Achúcarro, V. Atal and Y. Welling, “On the viability of m 2 ϕ 2 m^{2}\phi^{2} and natural inflation,”
Original
2015
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A. Kehagias and A. Riotto, High Energy Physics Signatures from Inflation and Conformal Symmetry of de Sitter
Original
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Original

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2017

Massive Fields as Systematics for Single Field Inflation

Jiang, Hongliang, Wang, Yi

Understand

During inflation, massive fields can contribute to the power spectrum of curvature perturbation via a dimension-5 operator.

This contribution can be considered as a bias for the program of using $n_s$ and $r$ to select inflation models.
Even the dimension-5 operator is suppressed by $\Lambda = M_p$, there is still a significant shift on the $n_s$-$r$ diagram if the massive fields have $m\sim H$.
On the other hand, if the heavy degree of freedom appears only at the same energy scale as the suppression scale of the dimension-5 operator, then significant shift on the $n_s$-$r$ diagram takes place at $m=\Lambda \sim 70H$, which is around the inflationary time-translation symmetry breaking scale.