Resilience of the standard predictions for primordial tensor modes

TL;DR

This paper demonstrates that the primordial tensor power spectrum prediction during inflation is robust and cannot be altered at leading order, with only higher derivative parity-violating operators providing small corrections.

Contribution

It shows that the tensor amplitude unambiguously determines the inflation energy scale and that predictions are frame-independent, establishing robustness of the standard inflationary tensor spectrum.

Findings

Tensor spectrum prediction is invariant under disformal transformations.

Leading order corrections arise only from higher derivative parity-violating operators.

The standard tensor correlator remains unaffected by frame choices or model variations.

Abstract

We show that the prediction for the primordial tensor power spectrum cannot be modified at leading order in derivatives. Indeed, one can always set to unity the speed of propagation of gravitational waves during inflation by a suitable disformal transformation of the metric, while a conformal one can make the Planck mass time-independent. Therefore, the tensor amplitude unambiguously fixes the energy scale of inflation. Using the Effective Field Theory of Inflation, we check that predictions are independent of the choice of frame, as expected. The first corrections to the standard prediction come from two parity violating operators with three derivatives. Also the correlator $<\gamma\gamma\gamma>$ is standard and only receives higher derivative corrections. These results hold also in multifield models of inflation and in alternatives to inflation and make the connection between a (quasi) scale-invariant tensor spectrum and inflation completely robust.