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2014

Resilience of the standard predictions for primordial tensor modes

Creminelli, Paolo, Gleyzes, Jérôme, Noreña, Jorge et al.

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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.

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