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Future cosmic microwave background polarization experiments will search forevidence of primordial tensor modes at large angular scales, in the multipolerange $4 \leq \ell \leq 50.$ Because in that range there is some mild evidenceof departures from scale invariance in the power spectrum of primordialcurvature perturbations, one may wonder about the possibility of similardeviations appearing in the primordial power spectrum of tensor modes. Here weaddress this issue and analyze the possible presence of features in the tensorspectrum resulting from the dynamics of primordial fluctuations duringinflation. We derive a general, model independent, relation linking features inthe spectra of curvature and tensor perturbations. We conclude that even withlarge deviations from scale invariance in the curvature power spectrum, thetensor spectrum remains scale invariant for all observational purposes.

Scale invariance of the primordial tensor power spectrum